GOST R ISO 21809-2-2013

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  ГОСТ Р ИСО 21809-2-2013

GOST R ISO 21809−2-2013 Pipe with external coating for underground and underwater pipelines used in the transport systems of the oil and gas industry. Part 2. Pipe with epoxy coating. Specifications

GOST R ISO 21809−2-2013

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

Pipe with external coating for underground and subsea pipelines used in the transport systems of the oil and gas industry.

Part 2: Pipes with epoxy coating. Specifications

Pipes with an external coating for underground and underwater pipelines of transport systems of the oil and gas industry. Part 2: Pipes with epoxy coatings. Specifications

OKS 23.040.10*
GST 14 6000

_____________________

* According to the official website of Rosstandart OKS 75.200,

here and further. — Note the manufacturer’s database.

Date of introduction 2015−01−01

Preface

1 PREPARED by Subcommittee SC 4 «Pipe with corrosion-resistant coatings» of Technical Committee TC 357 «Steel and cast iron pipes and cylinders» and Open joint stock company «Russian scientific research Institute of pipe industry» (JSC «RosNITI») based on the authentic translation of the standard referred to in paragraph 4, which made the Federal state unitary enterprise «Russian scientific and technical centre of information on standardization, Metrology and conformity assessment» (FGUP «STANDARTINFORM»)

2 SUBMITTED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders"

3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology, dated 22 November 2013 No. 2053-St*

________________

* Probably, the error of the original. Should read: by Order of the Federal Agency for technical regulation and Metrology dated November 22, 2013 # 1980-article — note the manufacturer’s database.

4 this standard is identical to international standard ISO 21809−2:2007* «the Industry of oil and gas. Exterior coatings for underground or submerged pipelines used in the transportation through pipelines. Part 2. A filler epoxy coatings» (ISO 21809−2:2007 Petroleum and natural gas industries-External coatings for buried or submerged pipelines used in pipeline transportation systems. Part 2: Fusion-bonded epoxy coatings), including a technical amendment Cor.1:2008.

Technical amendment to the specified international standard adopted after its official publication, listed in the text of this standard and a dedicated double vertical line located on the margins of the text, and the designation and the year of adoption technical amendments are indicated in brackets after the appropriate text (in the notes to the text).

The name of this standard changed with respect to names specified international standard for compliance with GOST R 1.5−2004 (subsection 3.5).

In applying this standard it is recommended to use instead of the referenced international standards corresponding national standards of the Russian Federation and interstate standards, details of which are given in Appendix YES

5 INTRODUCED FOR THE FIRST TIME


Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in a future issue of information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet (gost.ru)

Introduction

This standard is identical to international standard ISO 21809−2:2007 «the oil and gas Industry. Exterior coatings for underground or submerged pipelines used in the transportation through pipelines. Part 2. A filler epoxy coatings».

International standard ISO 21809−2 developed by ISO technical Committee ISO/TC 67 «Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industry», Subcommittee SC 2 «Pipeline transportation system».

Users of ISO 21809−2 should know that for specific applications you may need additional or different requirements. ISO 21809−2 does not prohibit the customer to offer and manufacturer to use alternative equipment or engineering solutions for specific applications. This particularly applies to innovative or emerging technologies. If the suggested alternative, then the customer should specify all deviations from ISO 21809−2 and provide details.

1 Scope

This standard establishes requirements for the certification, manufacture, testing, transfer and storage of materials intended for factory-applied exterior single-layer weld epoxy coatings (hereafter FBE) pipe used in pipeline transportation systems oil and gas industry specified in ISO 13623.

This standard does not apply to heat-resistant coating with a glass transition temperature above 120 °C, and primer FBE applied to three-layer or multi-layer polymeric coatings based on polyethylene or polypropylene.

Note — Pipe with coatings of the present standard are considered suitable for the use of additional cathodic protection.

2 Normative references

This standard uses the regulatory references to the following standards:*
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For dated references, only use the specified edition of the standard. In the case of undated references, the latest edition of the standard.

* The table of conformity of national standards international see the link. — Note the manufacturer’s database.


ISO 31−0: 92Quantities and units — Part 0: General principles (ISO 31−0:1992 Quantities and units — Part 0: General principles)
_______________
Functions ISO 80000−1:2009 «Quantities and units. Part 1. General provisions"


The ISO 8130−2 coating Powders — Part 2: Determination of density using a gas pycnometer (reference method) (ISO 8130−2 Coating powders — Part 2: Determination of density by gas comparison pyknometer (referee method))

The ISO 8130−3 coating Powders — Part 3: Determination of density with liquid pycnometer application (ISO 8130−3 Coating powders — Part 3: Determination of density by liquid displacement pyknometer)

ISO 8501−1:2007 Preparation of steel substrates before application of paints and related products. Visual assessment of surface cleanliness. Part 1. The degree of rustiness and degree of preparation bare steel surfaces and steel substrates after completely removing previous coatings (ISO 8501−1:2007 Preparation of steel substrates before application of paints and related products. Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings)

ISO 8502−3 Preparation of steel substrates before application of paints and related products. Tests for the assessment of surface cleanliness. Part 3. Assessment of the dustiness of steel substrates prepared for painting (adhesive tape method) (ISO 8502−3 Preparation of steel substrates before application of paint and related products. Tests for the assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method))

ISO 8502−6 Preparation of steel substrates before application of paints and related products. Tests for the assessment of surface cleanliness. Part 6. Extraction of soluble contaminants for analysis. Bresle method (ISO 8502−6 Preparation of steel substrates before application of paints and related products. Tests for the assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis. The Bresle method)

ISO 8502−9 Preparation of steel bases before applying paint and similar coatings. Tests for the assessment of surface cleanliness. Part 9. The method of determining the location by using conductometry water-soluble salts (ISO 8502−9 Preparation of steel substrates before application of paints and related products. Tests for the assessment of surface cleanliness — Part 9: Field method for the conductometric determination of water-soluble salts)

ISO 8503−4 Preparation of steel substrates before application of paints and related products. Characteristics of roughness of the steel surface after sand blasting or shot blasting. Part 4. Method for the calibration of Comparators surface profile ISO and determine the surface profile. The technique with the use of the instrument with the probe (ISO 8503−4 Preparation of steel substrates before application of paints and related products; surface roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile. Stylus instrument procedure)

ISO 8503−5 Preparation of steel substrates before application of paints and related products. Test characteristics of the roughness of the steel surface after sand blasting or shot blasting. Part 5. Replica method for the determination of the surface profile (ISO 8503−5 Preparation of steel substrates before application of paints and related products. Surface roughness characteristics of blast-cleaned steel substrates — Part 5: Replica tape method for the determination of the surface profile)

EN 10204 metal Products. The types of documents acceptance control.

ISO 10474:91Steel and steel products. Documents acceptance control. (ISO 10474:1991 Steel and steel products. Inspection documents)
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Valid ISO 10474:2013 Steel and steel products — Inspection documents


ISO 11124−2 Preparation of steel substrates before application of paints and related products. Specifications for metallic abrasives for sandblasting or shot blasting. Part 2. The grit of chilled cast iron (ISO 11124−2:1993 Preparation of steel substrates before application of paints and related products — Specifications for metallic blast-cleaning abrasives — Part 2: Chilled-iron grit)

ISO 11124−3 Preparation of steel substrates before application of paints and related products. Specifications for metallic abrasives for sandblasting or shot blasting. Part 3. The shot grit high carbon cast steel (ISO 11124−3:1993 Preparation of steel substrates before application of paints and related products — Specifications for metallic blast-cleaning abrasives — Part 3: High-carbon cast-steel shot and grit)

ISO 11124−4 Preparation of steel substrates before application of paints and related products. Specifications for metallic abrasives for sandblasting or shot blasting. Part 4. The fraction of low carbon cast steel (ISO 11124−4:1993 Preparation of steel substrates before application of paints and related products — Specifications for metallic blast-cleaning abrasives — Part 4: Low-carbon cast-steel shot)

ISO 11357−1 Plastics. Differential scanning calorimetry (DSC). Part 1. General principles (ISO 11357−1:2009 Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles)

SSPC-AB 1Mineral and slag abrasives (SSPC-AB 1 Mineral and Slag Abrasives)
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SSPC: the Society for protective coatings, 40 24th Street, 6th Floor, Pittsburg. PA 15222−4656, USA


SSPC-AB 2 cleanliness of the restored abrasive, ferrous metal (SSPC-AB 2 Cleanliness of Recycled Ferrous Metallic Abrasives)

SSPC-AB 3 Abrasives, ferrous metal (SSPC-AB 3 Ferrous Metallic Abrasive)

SSPC-SP 1 solvent Cleaning (SSPC-SP 1 Solvent cleaning)

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 the manufacturer of the coating (applicator): the Company performing coating in accordance with the provisions of this standard.

3.2 batch (batch): the Number of the epoxy powder, manufactured with the same formulation of the raw materials of the same manufacturer during a continuous production cycle lasting no more than 8 hours.

3.3 batch certificate (batch certificate): a Certificate certifying the quality of the product, its compliance with the standards, specifications issued by the manufacturer of the materials.

3.4 by agreement (by agreement): the Requirement agreed between the producer and the customer.

3.5 certificate of conformity (certificate of compliance): a Document issued according to ISO 10474 or EN 10204, in which the manufacturer certifies that the supplied products meet the requirements of the order, with test results in the document are not given.

3.6 non-insulated end (cutback): the pipe End is free of the coating.

3.7 glass transition (glass transition): a Reversible change in an amorphous polymer or in amorphous regions of a partially crystalline polymer in the transition from viscous or kauchukopodobnoe to solid state and relatively fragile (or Vice versa).

3.8 glass transition temperature (glass transition temperature): Temperature at which the transition occurs.

Note — Installed thus the glass transition temperature, may be different, depending on the specific properties of the method and conditions of its determination.

3.9 a pass into the coating (holiday): the Lack of continuity of the coating having a specific electrical conductivity at a certain electrical resistance.

3.10 sample with a laboratory coating (laboratory-coated test specimen): the coated Sample produced in the laboratory.

3.11 the manufacturer (manufacturer): the manufacturer of the original coating materials.

3.12 specification manufacturer (manufacturer's specification): the Document setting forth the material characteristics, test requirements and recommendations for the application of coating material.

3.13 pipe diameter (pipe diameter length): nominal outside diameter of pipe at any portion along its axis.

3.14 pipeline (pipeline): pipeline systems for transporting fluids, consisting of pipes, fittings, components and valves.

3.15 pipeline transportation system (pipeline transportation) system: Pipeline with compressor or pump stations, stations, pressure control stations, flow control, measurement systems, tank storage, with a system of Supervisory control and data acquisition (SCADA), safety systems, corrosion protection and any other equipment or facilities used to transport fluids.

3.16 the customer (purchaser): the Company responsible for issuing the order.

3.17 the test report (test report): a Document containing the results of tests carried out in accordance with the requirements of this standard.

3.18 control ring (ring test): the Sample cut from the coated pipe.

3.19 acceptance certificate 3.1 (inspection certificate 3.1 B); the operational acceptance certificate 3.1 (inspection certificate 3.1): a Document issued according to ISO 10474 or EN 10204, in which the results of testing of coated pipes, issued and signed by a representative of the manufacturer of the coating authorized to issue such documents.

4 Symbols and abbreviations

4.1 Notation

This standard applies the following designations:

the degree of polymerization of the deposited epoxy (FBE) coating, %;

 — the height of the segment of pipe cover, mm;

 — the enthalpy change, j;

 — weight, g;

the glass transition temperature,°C;

 — change the glass transition temperature,°C;

 — mass fraction of epoxy powder remaining on the sieve, in percent of all samples, %;

 — mass fraction of volatiles/moisture, %.

4.2 Reduction

This standard applies the following abbreviations:

d.c. — constant current;

DSC — differential scanning calorimeter;

FBE — weld epoxy;

HRC — scale hardness Rockwell;

ID — inside diameter;

OD — outer diameter;

ppd — length — a length equal to the diameter of the pipe.

5 General requirements

5.1 Rounding

If this standard is not specified, to determine compliance, test results, or calculations should be rounded to the last smallest category used to record the limit values in accordance with ISO 31−0:1992, (Annex b, rule A).

Note — For this standard is the rounding method according to the standard [1] is equivalent to the method of rounding is according to ISO 31−0:1992, (Annex b, rule A).

5.2 Compliance with this standard

To ensure compliance with the requirements of this standard should apply quality system and environmental management system.

Note — In the standard [2] are focused on specific industry guidance for quality management systems, in the standard [3] provides guidance on the selection and application of an environmental management system.


The manufacturer is responsible for compliance with all relevant requirements of this standard. The customer has the right to conduct any tests necessary to ensure assure compliance with factory statutory requirements and to reject any nonconforming material and/or coating.

6 Information provided by the customer

6.1 General information

When ordering, must include the following information:

a) designation of this standard;

b) the number of tubes, outer diameter, minimum wall thickness, minimum, maximum, and average length, steel grade;

c) indication of standard or specification for uninsulated pipes, for example [1];

d) minimum and maximum permissible thickness of the coating;

e) the length of the uninsulated part and its limit deviation for both ends of the pipe;

f) maximum design temperature of the pipe (°C).

6.2 Additional information

When ordering, must specify which of the following provisions apply for the specific order item:

a) an additional surface treatment;

b) factory acceptance by the customer;

c) the increased length of the control ring;

d) the location of the control ring;

e) frequency additional test rings;

f) additional markings;

g) procedures for disposal.

h) storage procedures;

i) waiver of test reports;

j) other special requirements.

7 Materials

7.1 Pipe

Pipe coating shall conform to standard or specifications specified in the order.

Note — Tubes, corresponding to such standards or specifications may have a surface condition for the application of the FBE, for example, the temporary coating, salt contamination, burrs (prisoners of war).

7.2 Epoxy powder

7.2.1 General provisions

The manufacturer of the coating shall use epoxy powder that must:

a) to meet the requirements of 7.2.2 and 8.1, and to be compatible with the requirements of 10.2.2;

b) have the following identification data:

— the name of the manufacturer of the powder;

— the name of the product;

— mass material;

— the batch number;

the location of the producer;

— producer’s identification number;

temperature requirements for transport and storage;

— date of manufacture;

— the date of expiry.

c) be moved, transported and stored prior to use in accordance with the manufacturer’s recommendations.

7.2.2 Properties

Indicators of the epoxy powder shall meet the requirements specified in table 1. The test results shall be documented in the Protocol in accordance with ISO 10474 and provided by the manufacturer of the coating.


Table 1 — Minimum requirements for epoxy powder

Name of the indicator	Requirements	Test method
Curing time	Within the limits prescribed by manufacturer specification	A. 2 (Annex A)
Gelation time	Within the limits prescribed by manufacturer specification	A. 3 (Annex A)
The content of volatile matter/moisture by weight	Not more than 0.6%	A. 5 (Appendix A)
Particle size	No more than the residual on the sieves of 150 µm and 250 µm within the limits prescribed by manufacturer specification	A. 6 (Annex A)
Density	Within the limits prescribed by manufacturer specification	A. 7 (Appendix A)
Thermal characteristics	Within the limits prescribed by manufacturer specification	A. 8 (Appendix A)

7.2.3 Packaging

The epoxy powder must be contained in packaging with clear labeling that contains the information listed in 7.2.1, the enumeration of b).

8 Certification of coverage

8.1 Certification coating manufacturer, epoxy powder

The coating must be certified by the manufacturer by testing samples with laboratory coverage for each indicator for compliance with acceptance criteria. Samples with a laboratory coat must be made in accordance with paragraph 8.3.

Certification must be repeated, if changed:

a) the composition of the coating material;

b) the manufacturer of the material.

Table 2 lists the specifications, acceptance criteria, number of test specimens and test methods. The test results shall be documented in the Protocol in accordance with ISO 10474 and is provided by the manufacturer of the epoxy powder on request.


Table 2 — Minimum requirements for the certification tests cover

Name of the indicator	Acceptance criteria	The number of samples	Test method
Thermal characteristics	at least 5 °C above maximum design temperature of the pipeline	1	A. 8 (Appendix A)
Cathodic delamination in 24 hours at a temperature of (65±3)°C and a potential of minus 3.5 In, (SOG.1:2008), no more	8 mm	3	A. 9 (Annex A)
Adhesion after aging in water for 24 hours at a temperature of (65±3)°C, point	from 1 to 2	3	A. 15 (Appendix A)
Adhesion after aging in water for 28 days at a temperature of (65±3)°C, point	from 1 to 3	3	A. 15 (Appendix A)
Cathodic exfoliation for 28 days at a temperature of (20±3)°C and a potential of minus 1.5 V, not more than	8 mm	3	A. 9 (Annex A)
Cathodic exfoliation for 28 days at a temperature of (65±3)°C and a potential of minus 1.5 To not more	15 mm	3	A. 9 (Annex A)
Porosity cross section	In accordance with figure A. 10.	1	A. 11 (Appendix A)
The porosity at the border of the cover	In accordance with figure A. 11	1	A. 11 (Appendix A)
Elasticity at a temperature of 0°C	The lack of cracking at bending 2.0° on length equal to the diameter of the pipe	5	A. 12 (Appendix A)
Impact strength, not less	1.5 j	3	A. 13 (Appendix A)
Cathodic cracking cracking of the coating during 28 days at temperature (20±3)°C and a potential of minus 1.5 In	The lack of cracking	3	A. 14 (Appendix A)

8.2 Certification coating manufacturer coating

The coating produced in the production must be certified by the manufacturer for each line of deposition. The manufacturer of the coating shall use materials approved in accordance with the requirements of 8.1.

Certification shall be considered successfully completed if the test results of samples with a laboratory coating, meet the requirements specified in table 3 and the test results of samples of coated pipes meet the requirements specified in table 4.


Table 3 — Minimum requirements for testing of samples with laboratory coating is carried out by the manufacturer

Name of the indicator	Acceptance criteria	The number of samples	Test method
Cathodic delamination in 24 hours at a temperature of (65±3)°C and a potential of minus 3.5 To not more	8 mm	1	A. 9 (Annex A)
Porosity cross section	In accordance with figure A. 10.	1	A. 11 (Appendix A)
The porosity at the border of the cover	In accordance with figure A. 11	1	A. 11 (Appendix A)
Elasticity at a temperature of 0°C	The lack of cracking at bending 2.0° on length equal to the diameter of the pipe	3	A. 12 (Appendix A)
Adhesion after aging in water for 24 hours at a temperature of (65±3)°C, point	from 1 to 3	1	A. 15 (Appendix A)

Table 4 — Minimum requirements for certification and testing of coated pipes

Name of the indicator	Acceptance criteria	The number of samples	Test methods
Degree of cure: DSC —	According to the manufacturer’s specifications	1	A. 8 (Appendix A)
Porosity	In accordance with figures A. 10 and A. 11	1	A. 11 (Appendix A)
The adhesion of the coating to steel at a temperature of (20±3)°C	Score the clutch from 1 to 2	1	A. 4 (Annex A)
Impact strength no more	1.5 j	One	A. 13 (Appendix A)
The strength of the coating when bent at 0 °C for thicknesses from 350 to 500 microns	No cracking at bending of 2.0 degrees on the length equal to the diameter of the pipe	3	A. 12 (Appendix A)
Adhesion to steel after aging in water for 24 hours at a temperature of (65±3)°C, point	from 1 to 3	1	A. 15 (Appendix A)
Cathodic delamination in 24 hours at a temperature of (65±3)°C and a potential of minus 3.5 To not more	8 mm	1	A. 9 (Annex A)
The contamination at the border of coverage, not more	30%	1	A. 10 (Annex A)
The test is performed on pipe or on a control ring. For coatings of greater thickness test is carried out by agreement between the purchaser and the manufacturer. Gaps in coverage are not allowed.

Certification will be repeated if you change the brand of the insulation materials and by changing the basic parameters of the technological process.

8.3 sample Preparation with laboratory coating

The samples made from low carbon steel dimensions in accordance with the applicable test method (Annex A). The surface of the sample is subjected to abrasive-blast cleaning steel shot at ISO 11124−3 to obtain the degree of surface cleaning grade Sa 2, corresponding to the requirements of ISO 8501−1.

The surface roughness of the sample should be from 50 to 100 microns. Roughness is measured in accordance with the requirements of ISO 8503−4 (dipstick method) or ISO 8503−5 (replica tape method).

The coating thickness should be from 350 to 500 microns. It is measured by coating thickness gauge, calibrated to ±5% of range final value.

9 Technology and equipment for the manufacture of coatings

9.1 General provisions

The coating of the ducts shall be certified in accordance with the requirements of 8.2.

9.2 surface Preparation

9.2.1 Initial surface preparation

The pipe surface must be cleaned from contaminants (grease and oil, preservatives, lubricants) in accordance with the requirements of SSPC-SP 1. All defects and inhomogeneity of steel (e.g., delaminations, slivers, burrs) must be removed by an approved method of abrasive Stripping. After Stripping the wall thickness should not go beyond the minimum.

The pipe surface must be dry before abrasive and shot blasting, and have a temperature of not less than 3 °C above dew point.

9.2.2 Abrasive and shot-blasting

Abrasives used for surface preparation before coating, shall conform to the requirements of ISO 11124−3.

Note — If the pipe to be coated, the coating has a high group strength, for example, X80, X100 or X120, to obtain the required degree of cleaning and surface roughness may require harder abrasives.


The abrasives (including recycled materials) so as not to contaminate the substrate must be clean, dry, without contaminants in accordance with SSPC-AB 1, SSPC-AB 2, and SSPC-AB 3.

The degree of surface cleaning before coating, must conform to Sa 2(«white metal») according to ISO 8501−1.

Surface roughness, measured in accordance with the requirements of ISO 8503−4 (dipstick method) or ISO 8503−5 (replica tape method) should be from 50 to 100 microns.

If after abrasive-blasting process requires grinding, then the maximum allowable area of grinding shall be 10 cmper meter of pipe length.

9.2.3 surface finish

Surface finish is measured in accordance with the requirements of ISO 8502−3 (adhesive tape method). The maximum permissible level is no worse than the second reference image.

9.2.4 Preliminary surface preparation

Pre-surface preparation of the pipe by the manufacturer (for example, deionized water, phosphoric acid and/or chromate), to be agreed with the customer.

When conducting the pre-treatment of laboratory samples it should be done and in the manufacture of coated pipes.

If the preliminary surface treatment is not performed, it is necessary to control the presence on the tube of soluble salts in accordance with the requirements of ISO 8502−6 or ISO 8502−9. The maximum allowable level of soluble salts after abrasive-blasting to 20 mg/m.

If measurements show high levels of soluble salts (20 mg/m), the manufacturer of the coating and the customer should coordinate the process of pre-cleaning the surface.

9.3 Temperature application and curing of the coating

The temperature of application and curing of the coating on the outer surface of the pipe is selected by the manufacturer of the coating according to the recommendations of the manufacturer of the materials; but they must not exceed 275 °C. Before cooling in water, the coating must be cured in accordance with certified procedures for loading and unloading operations.

Note — For steel grades above X80, the maximum temperature of curing can affect the pipe properties.

9.4 coating Thickness

The minimum and maximum allowable coating thickness should meet the requirements of the order. Except in 10.2.3.5, the minimum coating thickness shall not be less than 350 microns.

9.5 non-Insulated ends

Length of non-insulated all along their length on both ends of the pipe shall conform to the requirements of the order.

10 inspection and testing

10.1 inspection

If the order stipulates that inspection is carried out in the presence of the customer, the manufacturer shall provide the access control. Acceptance inspection is carried out in place of a coating, before shipping. Customer may request that the manufacturer cover the laid pipe required for monitoring and/or testing.

10.2 Test

10.2.1 the initial gel Time epoxy powder

Before release, each batch of epoxy powder is tested by determining the time of gelation. The tests are carried out in accordance with the requirements of A. 3 (Appendix A), and acceptance criteria shall conform to the requirements of table 1.

If the average gelation time does not meet the requirements, the test shall be repeated on two additional samples of material of each part. If both re-tests meet the requirements of time of gelation, the powder batch is subject to acceptance. If one or both re-tests meet the requirements, the batch of powder is subject to rejection.

10.2.2 Test coverage

The manufacturer of the coating shall produce samples, to conduct tests and assess coverage in accordance with the requirements of table 3 on the samples with a coating thickness that meets the requirements of the order 6.1, the enumeration of d.

Scope of tests — one sample for each received batch of epoxy powder.

Before starting the epoxy powder in production, the manufacturer of the coating shall produce samples to the laboratory coating. The modes of application and curing of coatings on laboratory specimens should correspond to the modes of application and curing of the coating on the pipe. Indicators, number of samples, test methods and acceptance criteria shall conform to the requirements of table 3.

If the test results do not meet the requirements specified in table 3, the manufacturer of the coating shall repeat the tests on twice the number of samples. If the results of re-tests meet the requirements, the batch of powder is subject to acceptance. If the results of repeated tests of at least one of samples do not meet the requirements, the batch of powder is subject to rejection.

Any batch of powder is not stored according to the requirements of the manufacturer of the material must be re-tested for compliance with 10.2.1 and 10.2.2.

10.2.3 Technological control of manufacture of coated pipes in the production process

10.2.3.1 the Quality of surface preparation

In the production process the purity and advanced surface preparation for compliance with 9.2.3, and 9.2.4 must be monitored and recorded at least once in 2 hours.

10.2.3.2 Control of surface roughness

In the production process at least once in 4 hours, it is necessary to measure the roughness of the outer surface and record the results using the profilometer, the film replication or an equivalent method approved by the customer. Surface roughness must comply with the requirements of 9.2.2.

10.2.3.3 Visual inspection

After cleaning, each pipe is subjected to visual inspection for defects and flaws of the surface (9.2.1), which may cause gaps in coverage. Such surface defects must be removed by Stripping, provided that the wall thickness of the pipe is within the prescribed limits. Pipes with surface defects should be discarded or subjected to repair by the customer.

10.2.3.4 Temperature coating

The surface temperature of the pipe during application of the epoxy powder must be controlled and regulated within the limits approved by the manufacturer coverage, the customer and the manufacturer of the powder. A method of measuring the surface temperature of the pipe must also be agreed between the manufacturer coverage, the customer and the manufacturer of the powder.

After stabilization of the temperature during coating, the temperature of the pipe to measure and record at least once per hour.

10.2.3.5 the thickness of the coating

The coating thickness is measured at three randomly selected points along the length of each pipe with the coating thickness. The thickness gauge is calibrated according to the standard, the thickness of which is within ±20% of the nominal coating thickness specified in the order, at least once per shift (not more than 12 hours). The results of measuring the coating thickness should be recorded.

If a separate measurement of coating thickness is less than 350 microns, then the pipe thickness is measured along the pipe at intervals of not more than 1 m. the Average value of these measurements for each pipe must be at least 350 microns and no individual thickness value shall not be less than 300 microns.

If the coated pipe does not meet the requirements of this subsection, it should be cleaned and re-coated in accordance with the requirements of 11.3.

10.2.3.6 Control gaps in coverage

10.2.3.6.1 General provisions

The dielectric continuity of the coating is monitored for each tube by using a spark detector.

For monitoring of the continuity of coverage potential DC spark detector should be installed higher than 5 V To the last micrometre of nominal coating thickness. The detector should be calibrated not less than once per shift (lasting more than 12 hours).

Testing is carried out at a temperature of the coating below 100 °C or by agreement between the customer and the factory coating of pipes.

10.2.3.6.2 acceptance Criteria

There must be no gaps in coverage.

Pipes that have gaps in the coating, should be subjected to maintenance in accordance with the recommendations 11.2, provided that the number of absences does not exceed:

a) for pipes with outer diameter less than 355.6 mm to 1.0 per meter length of the testing pipe, defined as the quotient of the total number of admissions total length of pipe in feet;

b) for pipes with outside diameter of 355,6 mm — 0.7 per square meter of the testing pipe, defined as the quotient of the total number of passes total external surface area in square meters.

If the number of absences exceeds the limit, or if the area of each pass equal to or greater than 250 cm, the tube on which it is found, should be cleaned and subjected to re-coating in accordance with the requirements of 11.3.

10.2.4 requirements for the construction and testing of control rings

10.2.4.1 Equipment

The manufacturer of the coating shall have equipment for the manufacture, testing and assessment of the control rings for compliance with the requirements of table 4.

10.2.4.2 requirements for the construction of control rings

The control ring should be made from places at a distance of not less than 300 mm from the pipe end and having a size sufficient to conduct the mandatory tests, in accordance with the requirements specified in table 4. When preparing samples it is necessary to take into account the heat affected zone or work hardening.

10.2.4.3 Requirements for testing

The frequency of testing for each production line shall be one test ring of the trumpets every work shift (not more than 12 hours).

For pipes subjected to Stripping and re-coating, each order item must be selected at least one control ring.

For each of the control rings tested, number of samples, test methods and acceptance criteria shall conform to the requirements of table 4.

10.2.4.4 Re-testing

If the test results do not meet the requirements, then:

a) test (see table 4, column 2) should be carried out at twice the number of samples (see 10.4.2.4) selected from the same end of the pipe is not tested or

b) all pipe coating applied after the last unsatisfactory results from inspection until the next satisfactory result of the acceptance inspection shall be ground for re-coating in accordance with the requirements of 11.3.

If the results of repeated tests of both samples meet the requirements, the pipe coating is subject to acceptance.

If the results of repeated tests of one or both samples do not meet the requirements, then:

a) all the pipes with the coating applied after the last unsatisfactory results from inspection until the next satisfactory result of the acceptance inspection shall be ground for re-coating in accordance with the requirements of 11.3, or

b) in coordination with the customer can be carried out repeated tests to determine what the pipe with the coating applied after the last satisfactory result of the acceptance inspection to determine are valid. Rejected pipes shall be stripped for re-coating in accordance with the requirements of 11.3.

If the results of the control on the border of the cover are inaccurate due to the effect of prior surface treatment (e.g., color), the coating can be considered suitable by agreement between the purchaser and the manufacturer of the coating.

10.3 test Results

The results of the tests conducted in accordance with 10.2, are available upon customer request regardless of the refusal of test reports in order for the supply of pipes with coatings.

11 Repair of coated pipes

11.1 General provisions

According to the results of sections 9 and 10, the pipe is coated or repaired in accordance with the requirements of 11.2, or cleaned of coating and coated again in accordance with the requirements of 11.3.

11.2 Repair of gaps in coverage

Repair gaps in the coating is carried out in accordance with the procedures recommended by the manufacturer of the materials with the following requirements:

a) plots with a diameter of 6 mm or less repaired with the use of manufacturer’s recommended powder repair mix, two-component coating or similar material agreed with the customer;

b) areas with a diameter more than 6 mm and smaller than 250 cmare repaired with the use of manufacturer’s recommended two-component coating or similar material agreed with the customer;

c) the minimum thickness of the repaired coating shall conform to the requirements of 9.4;

d) all repaired areas should take control on the continuity in accordance with the requirements of 10.2.3.6;

e) number of repair locations on the pipe must be registered.

11.3 Stripping and re-coating

The pipe surface shall be cleaned by a combination of the following methods: heating to a temperature not above 275 °C, scraping, cleaning corretcly and/or abrasive-blast cleaning. The previously applied coating must be completely removed. Re-coating must be performed in accordance with the requirements of sections 9 and 10.

Note — For steel grades above X80, the maximum Stripping temperature can affect the pipe properties. Must be registered identification data of each cleaned pipe.

12 Marking

12.1 General provisions

Marking applied on the pipe coated in accordance with the requirements of 12.2 and with any additional markings specified in the order and agreed between the manufacturer and the customer.

12.2 Mandatory labeling

Marking includes:

— company name or trademark of the manufacturer of the coating;

— the designation of this standard;

— marking the manufacturer of the pipe without coating, with an indication of the standard;

— the date of coating application;

manufacturer of pipe, pipe outside diameter and wall thickness.

Marking is performed using a stencil or printing resistant inks of contrasting colors, providing safety for further identification.

13 Transportation and storage

13.1 Requirements for handling

Loading and unloading of coated pipes is done that way to avoid damage to the pipes, ends of pipes and coatings.

The manufacturer of the coating shall provide requirements to the procedure of loading and unloading; if the transportation meets the coating manufacturer and specified in the order.

Pipe coating damaged during transportation, repair in accordance with the requirements of this standard and specifications for pipe.

Coating that is damaged after controlling for the presence of gaps (see 10.2.3.6), repair in accordance with the requirements of section 11.

Pipes transportyour on the cradles to prevent damage to the coating.

13.2 Storage

If specified in the order, the manufacturer of the pipe coating shall provide requirements for the storage of coated pipes.

14 test reports and certificate of conformity

Unless the order specified otherwise, the manufacturer of the coating shall issue the operational acceptance certificate type 3.1 In accordance with ISO 10474:1991 (or type 3.1 according to EN 10204:2004), which shows the results of the acceptance inspection and testing of coated pipes in accordance with this standard and all other requirements specified in the order. However, if the terms of the order, the customer waives the provision of the certificate of acceptance, the manufacturer of the coating shall provide a certificate of compliance.

Annex a (mandatory). Test methods

Appendix A
(required)

A. 1 General provisions

The present application contains methods that are used in this standard.

A. 2 curing Time of the epoxy powder

A. 2.1 Equipment

A. 2.1.1 hot plate, with precision temperature control up to 3 °C.

A. 2.1.2 Metal plate dimensions (25x150x150) mm.

A. 2.1.3 Contact thermometer.

A. 2.1.4 Stopwatch.

A. 2.1.5 Smear (see figure A. 1).

A. 2.1.6 the Spatula.

A. 2.1.7 Differential scanning calorimeter (DSC) with a cooling device.

A. 2.1.8 working knife with a handle length of (135±5) mm, with a metal blade thickness (0,65±0,1) mm and exposed cutting edge with a width of (25±5) mm. other sizes shown in figure A. 2. (Cor.1:2008)

Dimensions are in millimeters

Figure A. 1 — The Smear

1 — groove: (25±1)(0,9±0,1) mm

Figure A. 1 — The Smear

Dimensions are in millimeters

Figure A. 2 — Blade work knife

(30±5) mm; (57±5) mm; (18±3) mm

Figure A. 2 — Blade work knife

A. 2.2 test Procedure

A. 2.2.1 Heat a metal plate on the heating tile and maintain its temperature in the range of (232±3)°C.

A. 2.2.2 use apply a smear of epoxy powder on the metal plate to obtain a film coating thickness of 350 to 500 microns. At the time of applying the powder onto the surface of the metal plate, start the stopwatch.

A. 2.2.3 Prescolite coating prior to complete gelation, as shown in figure A. 3, by means of a knife or spatula to produce 10 strips of coating.

Figure A. 3 — Plate with the coating film

1 — cover; 2 — a dividing line, made with a knife or spatula; 3 — metallic plate

Figure A. 3 — Plate with the coating film

A. 2.2.4 (30±1) seconds after you start the stopwatch with the working of the knife, remove a strip of coating and immediately chill in cold water.

A. 2.2.5 every following (30±1) seconds and repeat operation A. 2.2.4. Consistently remove cover bands.

A. 2.2.6 differential scanning calorimeter, determine the change in the value of glass transition temperature or the degree of polymerization in accordance with the requirements of A. 8.4.3.1 or A. 8.4.3.2, respectively.

A. 2.2.7 According to the manufacturer’s instructions powder plot the dependence of the degree of polymerization, percentage change of the glass transition temperature or time.

A. 2.3 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— the time in seconds corresponding to 2 °C; or the time in seconds corresponding to the degree of polymerization of 99%.

A. 3 the gel Time of the epoxy powder

A. 3.1 Equipment:

A. 3.1.1 hot plate, with precision temperature control up to 3 °C.

A. 3.1.2 Metal plate placed on a hot plate.

A. 3.1.3 Stopwatch or electric timer with a resolution of 0.1 seconds.

A. 3.1.4 Smear (see figure A. 1).

A. 3.2 test Procedure:

A. 3.2.1 to Conduct three sets of tests and averaged the results.

A. 3.2.2 Heat and maintain the temperature of the surface of the metal plate, which will be in contact with the powder and within the (205±3)°C.

A. 3.2.3 Apply to the metal plate with epoxy powder on the width of the stroke (25 mm).

A. 3.2.4 Smooth motion smooth epoxy powder on the metal plate, hold the swab at an angle of approximately 45° degrees to the surface of the metal plate, thereby creating a strip of epoxy powder width of about 25 mm.

Note — the Required thickness of the cured film is from 350 to 450 microns.

A. 3.2.5 Start the stopwatch at the time of application of the powder on a metal plate.

A. 3.2.6 hold the Swab at an angle of approximately 45° degrees to the surface of the metal plate so that most of the weight smear was based on the plate. With repetitive movements of the swim stroke smooth out the melted epoxy powder. Stop the stopwatch when the smear will no longer be in contact with the metal plate as shown in figure A. 4.

Figure A. 4 — Estimation of the gel time

Figure A. 4 — Estimation of the gel time

A. 3.3 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

the gel time in seconds.

A. 4 the Adhesion of the coating to the steel at a temperature (20±3)°C

A. 4.1 Equipment

A. 4.1.1 working knife, see A. 2.1.8.

A. 4.2 Samples

The test is carried out on the coated pipe or on a control ring.

A. 4.3 test Procedure

A. 4.3.1 Apply a V-shaped notch to form two lines with a length of 20 mm intersecting at an angle of 30° to 45° approximately 5 mm from their ends.

A. 4.3.2 insert the tip of the knife at the point of intersection at an angle of 45° degrees to the surface, then jerk try to move the cover within the V-shape figure. If the coating is not be or a little easy to remove, repeat this action within the V-shaped pieces at least four times to ensure coating integrity.

A. 4.3.3 Examine the appearance and flaking of the surface and perform a comparison on the following points:

— Point 1: at No point of the V-shaped notches, the coating is not removed. On all surface areas are coupled to the coating;

— Score 2: the Coating is difficult to remove small pieces. A significant amount of coating remains coupled to the metal surface;

— Score 3: Coating removed pieces of a larger area than the tip of the knife inserted under the coating. Part of the coating remains coupled to the surface of the metal within the V-shaped notches;

— Score 4: the Coating is removed completely with minimal resistance. Within the V-shaped notches remains of the coating coupled to a surface of the metal.

A. 4.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— score chaining.

When testing coated pipes must specify the number or identity of the pipe.

A. 5 the Total content of volatile matter/moisture in the epoxy powder. Weight loss

A. 5.1 Method A (manual)

A. 5.1.1 Equipment.

A. 5.1.1.1 drying oven with precision temperature control up to 3 °C.

A. 5.1.1.2 Scales with an accuracy of 0.001 g.

A. 5.1.1.3 Desiccators.

A. 5.1.1.4 Crucibles.

A. 5.1.2 test Procedure.

A. 5.1.2.1 Weigh the empty crucible to the nearest 0.001 g. a sample of the epoxy powder mass of 10 g, mixed thoroughly, placed in a crucible, weigh the crucible with powder to the nearest 0.001 g. After weighing, the crucible is rotating, distribute the contents in a thin layer across the bottom surface.

A. 5.1.2.2 the Crucible with epoxy powder placed in a drying oven and maintained at a temperature of (105±3)°C within 2 hours. After heating the crucible with epoxy powder was transferred to a desiccator, cooled to room temperature and weighed. Then the crucible is again placed in the desiccator; repeat the procedure for determining the mass of intervals of (60±10) minutes before until two successive result will not differ by more than 0,001 g.

A. 5.1.2.3 Calculated mass fraction of volatile matter/moisture according to the formula (A. 1)

, (A. 1)

where is the initial mass of the crucible and epoxy powder, g;

 — the final mass of the crucible and epoxy powder, g;

 — weight of crucible, g

A. 5. Method 2 (automatic)

The moisture content of the epoxy powder is determined using a device for automatic determination of moisture content by loss of mass.

A. 5.3 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— method used;

— the percentage of volatile matter/moisture.

A. 6 particle Size of the epoxy powder

A. 6.1 Equipment

A. 6.1.1 Air-jet sieving device with a vacuum fixture and sit on the 150 and 250 microns.

A. 6.1.2 Scales, accuracy 0.01 g.

A. 6.2 test Procedure

A. 6.2.1 Weigh the filter and one sieve to the nearest 0.01 g. Place approximately 20 g of epoxy powder into the sieve and record the mass of the powder to the nearest 0.01 g.

A. 6.2.2 Place the filter into the sieve, close and secure it. Turn on the sieve for 3 minutes.

A. 6.2.3 Remove the filter and weigh it to the nearest 0.01 g.

A. 6.2.4 Calculate the percentage of epoxy powder, which remained on the sieve according to the formula

, (A. 2)

where is the initial mass of powder on the sieve, g;

 — the weight of the filter, and sieves the remaining powder, g;

 — the weight of the filter sieve,

A. 6.2.5 Repeat the test with another sieve.

A. 6.3 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— the percentage of epoxy powder, which remained for each sieve size.

7 A. the density of the epoxy powder

A. 7.1 General provisions

At the discretion of the manufacturer of the coating determines the density of the epoxy powder by the method described in A. 7.2 or A. 7.3. Test temperature shall be (20±3)°C.

A. 7.2 Method A (manual)

A. 7.2.1 Equipment

A. 7.2.1.1 Scale accurate to 0.01 g.

A. 7.2.1.2 Flask capacity 100 ml to measure volume.

A. 7.2.1.3 white spirit.

A. 7.2.2 test Procedure

A. 7.2.2.1 Weigh the flask to the nearest 0.01 g.

A. 7.2.2.2 in the flask Add approximately 20 g of epoxy powder and weigh the flask with the powder to the nearest 0.01 g.

A. 7.2.2.3 Add the white spirit in an amount sufficient to cover the epoxy powder. Cap the flask and shake it for a few minutes so that the powder was not air pockets, bubbles, lumps. Rinse the stopper and sides of flask with white spirit so that they are clear of powder, and the flask was filled to 100 ml, Weigh the flask with epoxy powder and mineral spirits to the nearest 0.01 g.

A. 7.2.2.4 Release the bulb. Clean and dry it, add 100 ml of white spirit and weigh the flask with mineral spirits to the nearest 0.01 g.

A. 7.2.2.5 Calculate the density of white spirit in grams per liter according to the formula:

, (A. 3)

where is the density of white spirit, g/l;

 — the mass of the flask and the white spirit, g;

 — mass of flask, g.

A. 7.2.2.6 Calculate the density of the epoxy powder in grams per liter according to the formula:

, (A. 4)

where is the density of epoxy powder, g/l;

 — the mass of the flask and epoxy powder, g;

 — mass of flask, g;

the weight of the flask, epoxy powder and mineral spirits, in g;

 — the density of white spirit, g/L.

A. 7.3 Method In (automatic)

The density of the epoxy powder is determined using an air or helium pycnometer in accordance with ISO or ISO 8130−2 8130−3.

A. 7.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— used method;

— the type of pycnometer used in the method;

— density epoxy powder in grams per liter.

A. 8 Thermal analysis of epoxy powder and cured coating film

A. 8.1 General provisions

Thermal analysis is used to obtain the characteristics of the uncured epoxy powder and the cured coating film.

Apply the method of differential scanning calorimetry (DSC), General provisions and definitions given in ISO 11357−1. Processing and calibration must be carried out according to ISO 11357−1, if this standard is not otherwise specified.

A. 8.2 Equipment

A. 8.2.1 Differential scanning calorimeter (DSC) with a cooling device.

A. 8.2.2 Scales with an accuracy of 0.1 mg.

A. 8.2.3 Press to seal the sample.

A. 8.2.4 Aluminum crucibles with lids.

A. 8.2.5 Source dry clean for analysis .

A. 8.3 the Procedure of measurements for epoxy powder

A. 8.3.1 Measurement

Should be performed following the warm-up cycles, starting with cycle (a):

cycle (a): heat the sample from (25±5)°C and (70±5)°C at a rate of 20°C/min, then immediately cooled to (25±5)°C;

cycle (b): heat the sample from (25±5)°C to (275±5)°C at a rate of 20°C/min, then immediately cooled to (25±5)°C;

cycle (C): heat the sample from (25±5)°C to +40°C (typically 150°C) at a rate of 20°C/min, then immediately cooled to (25±5)°C.

For certain epoxy powders can be applied in other heating cycles according to the manufacturer’s instructions of the material.

A. 8.3.2 evaluation of the results

A. 8.3.2.1 glass transition Temperature,

The glass transition temperature of the epoxy powder is calculated at the point of inflection (figure A. 5).

Figure A. 5 — Examples of the thermal diagrams of epoxy powder

1 — cycle (b); 2 — cycle (C)

Figure A. 5 — Examples of the thermal diagrams of epoxy powder

The glass transition temperature of the uncured powder, calculated at the point of inflection of the curve obtained by the cycle (b), and the glass transition temperature of the cured material , calculated at the inflection point obtained for the cycle (s).

A. 8.3.2.2 the enthalpy Change of the reaction

The enthalpy change of the reaction obtained by integrating the maximum point of the graph of differential scanning calorimetry.

A. 8.4 the Procedure of measurement for the film of the cured coating

A. 8.4.1 General provisions

A sample of the cured film of coating mass (10±3) mg, weighed with an accuracy of 0.1 mg, placed in a crucible and hermetically closed with a lid. Weigh the crucible with the sample hardened film of the coating. Place the crucible with the sample hardened film of the coating and the reference sample in the DSC cell, was purged with dry nitrogen.

A. 8.4.2 Measurement

Should be performed following the warm-up cycles, starting with cycle (a) as a preparation:

cycle (a): heat the sample from (25±5)°C to (110±5)°C at a rate of 20°C/min, then cooled to (25±5)°C;

cycle (b): heat the sample from (25±5)°C to (275±5)°C at a rate of 20°C/min, then cooled to (25±5)°C;

cycle (C): heat the sample from (25±5)°C to +40°C (typically 150°C) at a rate of 20°C/min, then cooled to (25±5)°C.

For certain epoxy powders, it is possible to use other heating cycles according to the manufacturer’s instructions of the material.

Samples, taken from coated pipes stored in the warehouse prior to the test dry.

A. 8.4.3 Evaluation of results

A. 8.4.3.1 the glass transition Temperature

The glass transition temperature of the cured film of the coating determine the inflection point (figure A. 6). For the film of the cured coating is determined , the change in the glass transition temperature, by the formula:

, (A. 5)

where the glass transition temperature of the cycle (b) and A. 8.4.2;

the glass transition temperature of the cycle © and A. 8.4.2.

Figure A. 6 — Examples of the Thermal diagrams of the coating

1 — cycle (b); 2 — cycle (C)

Figure A. 6 — Examples of the Thermal diagrams of the coating

A. 8.4.3.2 residual heat of reaction of cured coating

The enthalpy change of the reaction is determined by the integration at the point of maximum exothermic DSC charts for the loop (b) and A. 8.4.2 calculation of the area bounded by the peak response and baseline. The fully cured film of the coating shall be no residual heat of reaction.

The degree of polymerization can be calculated according to the formula:

, (A. 6)

where is the enthalpy of the reaction of the epoxy powder; cycle (b) and A. 8.3.1;

 — enthalpy of reaction of the powder; cycle (b) A. 8.4.2.

A. 8.5 Results

Must be registered with the following information:

— the type of material and batch number;

— the date of the test;

— type differential scanning calorimeter;

for the epoxy powder: , , ;

for the cured film coating: , , , and .

During the production test coverage must specify the number or identity of the pipe.

A. 9 Cathodic flaking of the coating

A. 9.1 Equipment

A. 9.1.1 power supply rectified current with an adjustable output voltage.

A. 9.1.2 hot plate with a steel tray containing sand or steel shot, with temperature control with an accuracy of 3 °C or drying oven with temperature control with an accuracy of 3 °C.

A. 9.1.3 the Reference calomel electrode.

A. 9.1.4 Platinum wire electrode with a diameter of 0,8 mm.

A. 9.1.5 Plastic cylinder inner diameter (75±3) mm.

A. 9.1.6 sodium Chloride — 3% solution in distilled water.

A. 9.1.7 working knife (A. 2.1.8).

A. 9.1.8 Drill bit with a diameter of 3−6 mm.

Figure A. 7 — Getting artificial defect

1 — drill with a diameter of 3−6 mm; 2 — inlet cone; 3 — coating; 4 — metal specimen

Figure A. 7 — Getting artificial defect

A. 9.2 Samples

Samples with laboratory floors must have dimensions (1001006,4) mm. the Samples obtained from the control rings must have dimensions (100100wall thickness of the pipe) mm.

A. 9.3 test Procedure

A. 9.3.1 Take one sample tested by the flaw detector at a voltage of not less than 1800 In the absence of breakdown.

A. 9.3.2 In the center of the sample in a protective coating drill a cylindrical hole with a diameter of 3−6 mm before the formation of the metal conical recess. The metal should not be perforated (figure A. 7).

A. 9.3.3 Place the plastic cylinder so that its axis coincides with the center drilled in the coating of the hole, apply sealant around the cylinder.

A. 9.3.4 Fill the cylinder to a height of not less than 70 mm solution of sodium chloride, pre-heated to the test temperature. Mark the solution level in the cylinder. Enter into the solution the electrode and connect it to the positive pole of the source of DC power. Connect the negative pole of the power supply to the non-insulated section of the prepared sample.

A. 9.3.5 connect voltage (negative with respect to calomel reference electrode) into the sample and maintain a constant temperature at one or more modes of testing are shown in tables 2−4:

a) 1.5 V, (20±3)°C for 28 days;

b) 3.5 V, (65±3)°C for 24 hours;

c) 1.5 V, (65±3)°C for 28 days.

Maintain the solution level by adding, if necessary, distilled water (figures A. 8 and A. 9).

A. 9.3.6 On completion of the test remove the test cell, cool the sample in air up to (20±3)°C and rate characteristics of the cathode and peeling of the sample for 1 hour after the termination of the test.

A. 9.3.7 With working knife make in covering eight radial incisions through to the substrate, such cuts must retreat at least 20 mm from the center of the hole.

A. 9.3.8 Insert the tip of the blade of the working knife under the coating at the hole site. Blade acting as a lever, otslaivanie coating. Continue as long as the coating will not be to provide a distinct resistance to such action.

A. 9.3.9 Measure the length of the exfoliation as the distance from the edge of the original hole along each radial cut and average the results.

Figure A. 8 — Electrolysis chamber for testing pipes of size NPS 4 (114.3 mm) or more

Dimensions are in millimeters

1 — connecting electrode (cathode) to the negative pole; 2 — connecting electrode (anode) to the positive pole; 3 — connecting the reference electrode to the positive pole; 4 — reference electrode; 5 — plastic cover; 6 — a plastic Cup (inner diameter not less than 75 mm); 7 — electrolyte volume >300 ml; 8 — cover; 9 — steel design; 10; 12 sealant; 11 — artificial defect; 13 — electrode (cathode); 14 — platinum electrode with a diameter of 0,8−1,0 mm (anode); 15 — rectified current source; 16 — power supply

Figure A. 8 — Electrolysis chamber for testing pipes of size NPS 4 (114.3 mm) or more

Figure A. 9 — Electrolysis chamber for testing pipes smaller than NPS 4 (114.3 mm)

1 — the connecting pipe to the negative pole (-); 2 — artificial defect; 3 — electrolyte; 4 — insulator; 5 — connecting electrode to positive pole (+); 6 — glass

Figure A. 9 — Electrolysis chamber for testing pipes smaller than NPS 4 (114.3 mm)

A. 9.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— average length of exfoliation.

When testing coated pipes must specify the number or identity of the pipe.

A. 10 Contamination under the coating

A. 10.1 Equipment

A. 10.1.1 Stereomicroscope.

A. 10.1.2 working knife (A. 2.1.8).

A. 10.2 Samples

Samples must have dimensions of (25200thickness of pipe wall) mm, the section length of 200 mm should be placed along the pipe axis.

A. 10.3 test Procedure:

A. 10.3.1 by means of a knife remove from the sample, bent in accordance with the requirements of A. 11.3.1, the site coverage of approximately (3to 20) mm.

A. 10.3.2 Examine the surface of the metal under the coating with the stereo microscope at 40 x magnification. Rate the percentage of contamination of the metal surface.

A. 10.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

the percentage of contamination of the metal surface.

When testing coated pipes must specify the number or identity of the pipe.

A. 11 the porosity of the coating

A. 11.1 Equipment

A. 11.1.1 Stereomicroscope with 40 x magnification.

A. 11.1.2 a Vise or fixture for a directional bending.

A. 11.1.3 Freezer.

A. 11.1.4 operating blade (see A. 2.1.8).

A. 11.2 Samples

Samples with a laboratory coating should be size (6,4x25x200) mm. the Samples of the control rings must have dimensions (25х200х wall thickness of the pipe) mm, and the side of 200 mm must be parallel to the pipe axis.

A. 11.3 test Procedure:

A. 11.3.1 Cool the sample to -30°C and bend it 180 degrees in the Vice or on the device for the directional bending.

A. 11.3.2 the movement of the lever to open the portion of the coating from the bent test sample, and examine the coating for porosity at 40 x magnification.

A. 11.3.3 Compare the available porosity of the coating to the figures A. 10 and A. 11. If the porosity is equal to or less porosity, shown in the photos, the porosity rate as «acceptable». If the porosity exceeds shown in the photos, rate it as «unacceptable».

Figure A. 10 — Maximum allowable cross-section porosity of the delaminated coating

Figure A. 10 — Maximum allowable cross-section porosity of the delaminated coating

Figure A. 11 — Maximum allowable porosity on the boundary of coverage

Figure A. 11 — Maximum allowable porosity on the boundary of coverage

A. 11.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— assessment of porosity cross-section;

— assessment of porosity at the border of the coating.

When testing coated pipes must specify the number or identity of the pipe.

A. 12 the Elasticity of the coating

A. 12.1 Equipment

A. 12.1.1 Hydraulic press.

A. 12.1.2 Mandrels for bending with fixed radius.

A. 12.1.3 Cryochamber.

A. 12.1.4 load cells (if used).

A. 12.2 Samples

The samples covered in the laboratory should be size (6,4x25,0) mm, length at least 200 mm. the Samples of the control rings should have a thickness equal to the wall thickness of the pipe, a width of 25 mm and a length of at least 200 mm Side size 200 mm shall be parallel to the pipe axis.

A. 12.3 test Procedure:

A. 12.3.1 Smooth coating on the edge of the sample by removing all potential stress raisers. Place the sample in a cryochamber, cool it to (0±3)°C and soak it at that temperature for at least 1 hour.

A. 12.3.2 by Placing the sample on a flat surface, determine the height of segment d, which includes the specimen thickness and radius of curvature, as shown in figure A. 12.

A. 12.3.3 calculate the radius R of the mandrel corresponding to the angle of deflection of 2° degrees for a length equal to the diameter of the pipe, according to the formula

, (A. 7)

where R is the radius of the mandrel, mm;

d — height of the segment of the sample, mm.

A. 12.3.4 Bend the specimen on the mandrel, the radius of which does not exceed the value defined in accordance with the requirements of A. 12.3.3. the duration of bending of the sample should not exceed 10 seconds. The whole process should be completed no later than 30 seconds after taking the sample out of the cryo tube.

Note — If the behavior of the sample is characterized by extremes of relative deformation can be calculated by using strain gauges glued on the sample.

A. 12.3.5 Heat the sample to (20±5)°C and keep it at this temperature for at least 2 hours. In the next hour, visually inspect it for cracks.

Figure A. 12 — Definition of the sample thickness

Dimensions are in millimeters

1 — thickness of pipe wall; 2 — coating

Figure A. 12 — Definition of the sample thickness

A. 12.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— specified angle of deflection;

— the presence of cracks.

When testing coated pipes must specify the number or identity of the pipe.

A. 13 Impact strength of the coating

A. 13.1 Equipment

A. 13.1.1 a Device for monitoring the shock strength, comprising:

— falling weight with a mass of 1 kg;

— firing pin with a diameter of 15.8 mm;

— graduated tube with a slot, a length of 1 m;

— for the test sample with a laboratory coating — flat anvil hardness (55±5) HRC;

— to test samples of the control rings the anvil with a radius of 40 mm with a hardness of (55±5) HRC;

— fixed a wooden prop of a size not less than (600600600) mm with top made of solid wood.

A. 13.1.2 Detector DC.

A. 13.1.3 Cryochamber.

A. 13.2 Samples

Samples with a laboratory coating should have a size of approximately (25,0200,06,4) mm. the Samples of the control rings must have dimensions of about (25to 200thickness of pipe wall) mm. Side of 200 mm must be parallel to the pipe axis.

A. 13.3 test Procedure:

A. 13.3.1 Place the sample in a cryochamber cooled to minus (30±3)°C, soak in this temperature range for at least 1 hour. Place the cooled specimen in a device for controlling shock strength, mounted coaxially on the appropriate anvil.

A. 13.3.2 Triple strike sample with impact energy of 1.5 j, with the point of impact should be from each other at a distance of not less than 50 mm. These three shots must be completed within 30 seconds after taking the sample out of the cryo tube.

A. 13.3.3 Warm the sample up to (20±3)°C, Check for breakdown in the coating using a spark flaw detector, configured for voltage (1750±250), or the control voltage at the detector with a dampened sponge at a voltage (67,5±4,5) In or (90±5) V.

A. 13.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— the value of the applied impact energy;

— the voltage on the electrode of the spark detector;

— the number of breakdowns in coverage.

When testing coated pipes must specify the number or identity of the pipe.

A. 14 Cathodic cracking of the stressed coating

A. 14.1 Equipment

The equipment should meet the requirements of A. 9.1 and A. 12.1, with the exception that you must use a plastic cylinder with an internal diameter of (25±2) mm.

A. 14.2 Samples

Prepare samples of a size not less than (503006) mm.

A. 14.3 test Procedure

A. 14.3.1 Bend the sample as described in test method in elasticity (A. 12), to obtain a deflection of 2° at a length equal to the diameter.

A. 14.3.2 test sample, as described in A. 9 for 28 days, with a hole in the covering on the top of the bent sample, i.e. a plot of the maximum stress.

A. 14.3.3 After 28 days of testing, remove the electrodes and the plastic cylinder, remove moisture from the surface of the sample.

A. 14.3.4 the Area of the coating exposed to the electrolyte, it is necessary to investigate not later than 24 hours after the test. If in the study according to 10.2.3.6 on the surface of the sample there are no cracks, flaking or micro-holes, the test is passed successfully.

A. 14.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— the presence of cracks.

When testing coated pipes must specify the number or identity of the pipe.

A. 15 the Adhesion of the coating to the steel after aging in water at a temperature of (65±3)°C for 24 hours

A. 15.1 Equipment

A. 15.1.1 non-corrosive water bath with controlled temperature.

A. 15.1.2 Tap water.

A. 15.1.3 Thermometer.

A. 15.1.4 operating blade (A. 2.1.8).

A. 15.2 Samples

Samples with a laboratory coating should have a size of (100,0100,06,4) mm. the Samples of the control rings must have dimensions (100100wall thickness of the pipe) mm.

A. 15.3 test Procedure:

A. 15.3.1 For each test, use fresh tap water heated to (65±3)°C before immersion in her samples. Place the samples in a water bath so that they were completely submerged in water. Soak the samples in water at a temperature of (65±3)°C for 24 hours, then remove them from the water bath.

A. 15.3.2 While sample is still warm, using a work knife to cut through the coating in the rectangle of size (3015) mm to the substrate, then cool the sample in air up to (20±3)°C. Not more than 1 hour after test (A. 15.3.1), insert the tip of a working knife under the coating at the top of the rectangle. Blade acting as a lever, otslaivanie coating. Keep this up until all the coating in the rectangle is removed or the coating will not cease to resist such action.

A. 15.3.3 Evaluate the adhesion of the coating within the rectangle as follows:

— Score 1: peel off the cover completely fails;

— Score 2: detachment lends itself to less than 50% of the coating;

— Score 3: detachment lends itself to more than 50% of the coating, but the coating has a distinct resistance to the action of the blade-like arm;

— Score 4: the coating is easily peeling off in strips or large pieces;

— Score 5: the coating easily peels off in one piece.

A. 15.4 Results

Must be registered with the following information:

— the batch number of the epoxy powder;

— the date of the test;

— score chaining.

When testing coated pipes must specify the number or identity of the pipe.