GOST R 55436-2013

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  ГОСТ Р 55436-2013

GOST R 55436−2013 System naturally. Coating of extruded polyethylene to steel pipe. General technical requirements

GOST R 55436−2013

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

SYSTEM NATURALLY

COATING OF EXTRUDED POLYETHYLENE FOR STEEL PIPE

General technical requirements

Gas distribution systems. With extruded polyethylene Coatings on steel pipes. General technical requirements

OKS 23.040.10
OKP 13 9000
22 1110

Date of introduction 2013−10−01

Preface

1 DEVELOPED by the Open joint-stock company «Academy of municipal economy named. K. D. Pamfilova» (JSC «akkh them. K. D. Pamfilova»)

2 SUBMITTED by the Technical Committee on standardization TC 23 «Technique and technologies of oil and gas production»

3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology of June 5, 2013 N 134 St

4 this standard conforms to the international standards 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», NEQ) and ISO 8502−3:1992 «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 8502−3:1992 «Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method», NEQ) in the definition of the degree of purity of the isolated surfaces and designed to meet the basic regulations of state standard GOST ISO 8130.6−2002 «Paints. Part 6. Determination of gelation time of thermosetting powder coatings at a given temperature» in the methods of determining properties of materials
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* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.

5 INTRODUCED FOR THE FIRST TIME


Application rules of this standard are established in GOST 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 the upcoming issue of the monthly 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)
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* Probably a mistake of the original. Should read: GOST R 1.0−2012. — Note the manufacturer’s database.

1 Scope

1.1 this standard applies to the coating of extruded polyethylene (hereinafter PE coated) used for corrosion protection of steel underground and underwater pipelines laid on the territories of cities and settlements, as well as gas distribution networks and water systems, and establishes common technical requirements for two-layer and three-layer polyethylene coating deposited on the outer surface of steel pipes in the factory.

1.2 Polyethylene coatings are used for corrosion protection of steel pipes with diameter from 57 to 1420 mm and length up to 12.4 m according to GOST 9.602. Steel pipe intended for application to the surface of the coating, shall conform to the requirements of standards of tubes and specifications.

2 Normative references

This standard uses the regulatory references to the following standards:

GOST R 51164−98 steel pipe mains. General requirements for corrosion protection

GOST R 52079−2003 steel welded Pipes for trunk gas pipelines, oil pipelines and oil product pipelines. Specifications

GOST R 52568−2006* steel Tubes with a protective outer coating for main gas and oil pipelines. Specifications
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* On the territory of the Russian Federation the document is not valid. Valid GOST 31448−2012, here and hereafter. — Note the manufacturer’s database.

GOST 9.049−91 unified system of protection from corrosion and ageing. Polymeric materials and their components. Methods of laboratory testing for resistance to fungi

GOST standard 9.402−2004 unified protection system against corrosion and aging. Coating of paint. Preparation of metal surfaces for painting

GOST 9.602−2005 unified system of corrosion protection and aging. The construction of underground. General requirements for corrosion protection

GOST 427−75 Rulers measuring metal. Specifications

GOST 4650−80 Plastic. Methods for determination of water absorption

GOST 5009−82 emery Cloth abrasive cloth. Specifications

GOST 6433.2−71 electrical insulating Materials, solid. Methods for determining the electrical resistance at a constant voltage

GOST 8420−74 Materials. Methods of determination of conditional viscosity

GOST 8433−81 Substance auxiliary OP-7 and OP-10. Specifications

GOST 10692−80 Pipe steel, cast iron and fittings to them. Acceptance, marking, packing, transportation and storage

GOST 11262−80 Plastics. Test method tensile

GOST 11645−73 Plastic. The method of determining the melt flow index of thermoplastics

GOST 13518−68 Plastic. A method of determining the resistance of polyethylene to stress cracking

GOST 15088−83 (ST SEV 3760−82) Plastic. The method of determining the softening temperature of the thermoplastic at the Vic

GOST 15150−69 Machines, instruments and other technical products. Versions for different climatic areas. Categories, conditions of use, storage and transportation of the impact of climatic factors of the external environment

GOST 16336−77 Composition of polyethylene for cable industry. Specifications

GOST 16782−92 (ISO 974−80) Plastic. The method of determining the temperature brittleness at impact

GOST 16783−71 Plastic. Method of determining the brittleness temperature at squeezing the specimen folded loop

GOST 27271−87 Materials. Methods for determination of shelf life

GOST 28702−90 nondestructive testing. Ultrasonic thickness gauges. General technical requirements

GOST ISO 8130−3-2006 Paints. Part 3. Determination of density with liquid pycnometer application

GOST ISO 8130.6−2002 Paints. Determination of gelation time of thermosetting powder coatings at a given temperature

GOST ISO 8130.7−2001 Paints. Determination of the mass loss in the hot dryer

Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If replaced with a reference standard, which was given an undated reference, then it is recommended to use the current version of this standard, taking into account all enabled in this version modifications. If replaced with a reference standard, which is given a dated reference, it is recommended to use the version of this standard referred to above by year of approval (acceptance). If after approval of this standard in the reference standard, which is given a dated reference, a change affecting a provision to which reference, the provision is recommended to be applied without taking into account this change. If the reference standard is cancelled without replacement, the position in which reference is made to it, it is recommended to accept in part not affecting this link.

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 coating adhesion: Resistance to peeling of the coating from the pipe surface.

3.2 method of extruding: coating by pushing the molten polymer materials from the forming extruder head at the outer surface of the pipe.

3.3 dielectric covering continuity: the Absence of electrical breakdown when subjected to coating voltage from the high voltage DC source.

3.4 transient electrical resistivity of the coating: the coating Resistance actually in the circuit, «electrode-electrolyte-coating-pipe» characterizing the protective ability of the coating in the electrolyte.

4 Technical requirements

4.1 requirements for the condition of the outer surface of steel pipes

4.1.1 Before coating carry out a visual inspection of the outer surface of the pipe and the weld to detect surface defects (dents, burrs, shells, deposited droplets of metal and slag). Defects eliminate mechanical grinding, not deducing wall thickness of the pipe at the lower tolerance limit established in the standards for the pipe. The wall thickness of the tube after polishing is controlled by the thickness churchyard 28702. If you cannot fix the detected defects in the pipe is rejected.

4.1.2 Outer surface of the pipe before coating is treated with abrasive material (shot blasting or shot peening) to the degree of cleaning and surface roughness of 40 to 80 µm according to GOST R 52568. The surface temperature of the pipe prior to the abrasive treatment should be at least 40 °C and more than 3 °C above the dew point of the environment.

After grinding the surface of the pipe must be cleaned of dust. Dust particles should have a diameter of not more than 100 µm according to GOST R 52568.

4.1.3 All defects that became visible on the surface of the pipe as the result of blasting shall be removed by grinding, if it does not take the thickness of the tube wall at the lower tolerance limit established in the standards for the pipe.

4.1.4 the Time between cleaning and the start of applying an insulating coating should be no more than 2 hours at a relative humidity of more than 80% and not more than 3 hours at a relative humidity less than 80%.

4.1.5 depending on the applied systems of insulating materials and coating design in addition to abrasive blasting (see 4.1.3) can be conducted a chemical treatment (passivation) chromate, phosphate or chromate-phosphate solutions (see GOST 9.402).

4.1.6 When coating the surface temperature of the insulated pipe shall conform to the requirements of the routing of process pipe insulation, developed in accordance with the recommendations of the suppliers of insulating materials.

4.2 material Requirements for coverage

4.2.1 Properties of materials used as a primer layer in accordance with table 1 for epoxy powder compositions, and table 2 for liquid epoxy composites.


Table 1-Technical requirements for powder epoxy compositions

Table 2 — specifications for liquid epoxy compositions

The shelf life of the finished epoxy compositions prior to use in accordance with the recommendations of the material manufacturer.

4.2.2 Thermoplastic polymer composition for adhesive layer coating in accordance with table 3.


Table 3 — Technical requirements of the adhesive thermoplastic compositions

4.2.3 Plastic composition based on polyethylene of low, medium or high density with the addition of termoventilatore used for applying an outer plastic layer, in accordance with table 4.


Table 4 — specifications for polyethylene compositions

4.2.4 the Materials included in the coating composition should meet the regulatory requirements for these materials and ensure that polyethylene pipe coating in accordance with the requirements of this standard.

4.2.5 Compliance indicators applied materials technical requirements should be confirmed by quality certificates and the input control of the enterprise engaged in applying insulating coating on the pipe.

4.3 Requirements for plastic coatings

4.3.1 Coating is applied to the cleaned and heated to a predetermined temperature the surface of the steel pipes in the factory using mechanized production line by extrusion.

4.3.2 Plastic coating can be made of two-layer or three-layer.

4.3.2.1 two-layer polyethylene coating should have the following structure:

— the adhesion sublayer on the basis of hot-melt polymer composition with a minimum thickness of 200 microns;

— outer layer-based termoventilatore extruded polyethylene.

4.3.2.2 three-layer polyethylene coating should have the following structure:

— a primer layer based on a liquid epoxy composition with a thickness of 40 to 80 microns or powder epoxy composition with a thickness of 70 to 200 microns;

— the adhesion sublayer on the basis of hot-melt polymer composition with a minimum thickness of 200 microns;

— outer layer-based termoventilatore extruded polyethylene.

4.3.3 the Total thickness of two-layer and three-layer polyethylene coatings, depending on the pipe diameter and types of external coatings according to GOST 9.602, made on the basis of extruded polyethylene, in accordance with table 5.


Table 5 — Total thickness of two-layer and three-layer polyethylene coatings, depending on the pipe diameters

4.3.4 Insulating coating applied to steel pipe in accordance with table 6. At the same time:

a) the pipe ends must be free from coating on the length:

(80±20) mm — for pipes up to 114 mm;

(120±20) mm — for pipes with a diameter of more than 114 mm;

b) the angle of the bevel of the coating to the pipe surface should be no more than 30°.


Table 6 — specifications for polyethylene coatings

5 Requirements of environmental protection

5.1 Coating of extruded polyethylene shall not cause harm to the environment, health and genetic Fund of the person under test, storage, transportation and operation of the pipes with a polyethylene coating.

6 requirements for the quality control and testing methods

6.1 quality Control of polyethylene coatings for compliance with the requirements of this standard includes the following tests:

— acceptance;

— periodicals.

6.2 acceptance tests of pipes with polyethylene coating is carried out according to 4.3.4 and figures 1−3, 5, 6 of table 6 in the following amounts and number of pipes:

— length measurement-free coating of pipe ends with the help of a metal ruler according to GOST 427 with error of ±1 mm on each tube;

— measure the angle of the bevel of the coating to the pipe surface using the template-goniometer with the measurement error not more than 1° on each tube;

control the appearance of the coating is carried out visually without using the magnifying glass on each tube;

measuring coating thickness is performed by thickness of any type for measuring the thickness of non-ferromagnetic coatings on ferromagnetic substrate with a measuring accuracy of ±1 mm is not less than 10% of the pipes from the party in three sections of a pipe length and at least four points equally spaced around the circumference of the pipe;

— dielectric continuity of the coating is controlled spark detector this current of each tube;

— determination of the strength of the coating upon impact is carried out according to GOST R 51164 (Appendix A) — at least two pipes from the party;

— determination of adhesion of the coating to steel at a temperature of (20±2) °C is performed using digital algesimetric method of exfoliation strips of the coating at an angle of 90° relative to the surface of the pipe by 5% of the party, but at least two pipes from the party;

— determination of adhesion of the coating to steel at a temperature of (60±3) °C on one pipe from the party.

6.3 If there are unsatisfactory results of acceptance testing of tubes with plastic coating on at least one of the indicators 2, 5, 6 of table 6 for this indicator, repeat tests are carried out at twice the number of pipes selected from the same batch. In case of unsatisfactory results, re-testing may be performed piece-by-piece delivery pipe with control increased with unsatisfactory test results.

6.4 Periodic testing of polyethylene pipe coating is carried out in order to control the stability of coating quality in the development of technologies of coating, or change the process parameters, and also change the brand of insulation materials, but not less than once every 12 months.

6.5 in the periodic test control indicators 4, 7−16, 18 table 6.

6.6 Periodic testing carried out on samples cut from pipe with plastic coating (at least three samples for each indicator coating or in accordance with the requirements of standards for test methods).

Samples cut from two sections of the pipe with plastic coating (beginning and end). The sampling carried out on two pipes from the party, while pipes with diameter up to 159 mm cut samples in the form of pipe segments with a length of from 110 to 150 mm; for pipes with diameter of 159 mm to the samples in the form of strips with a size of 100x100 mm and 150х100 mm.

6.7 Testing on indicators 9 to 13 of table 6 is carried out on samples of the delaminated coating. Delaminated coating is obtained by the following method: to a thoroughly cleansed and heated to a predetermined temperature the surface of the pipe (without the adhesion sublayer and epoxy primer) is applied a layer of extruded polyethylene with a thickness from 1.8 to 2.5 mm, which rolled down to the pipe surface and after cooling is removed from the pipe surface.

6.8 tensile Strength at break and elongation at break of the delaminated polyethylene at different temperatures of testing (see table 6) determined according to GOST 11262. The tests are carried out on a tensile testing machine, which after stretching of the sample should provide load measurement accuracy up to 2%.

For tests used samples in the form of «blades» type 1 according to GOST 11262 with lengths of 33 mm and a width of 6 mm, cut from the delaminated coating using a standard knife.

For testing at temperatures different from room, use a heat chamber, automatically maintaining temperature within ±3 °C. the Speed of stretching of the samples shall be 100 mm/min when tested at a temperature of (20±2) °C and (60±3) °C, 50 mm/min at a temperature of minus (40±3) °C.

6.9 Resistance of polyethylene to stress cracking at a temperature of (50±0,5) °C, determined according to GOST 13518. For testing selected samples of the delaminated coating applied without adhesive, installed in the holder and kept in a special solution OP-7 GOST 8433. For resistance to cracking take time, hrs, from the beginning of the test to the appearance of cracks in 50% of samples.

6.10 Durability polyethylene coating to fotocellula aging at a temperature of (50±5) °C, determined according to GOST 16336. Irradiation of samples is carried out in a chamber with a lamp of appropriate power for 500 h After irradiation to determine the temperature of brittleness according to GOST 16782. Coverage think has stood the test if the temperature of embrittlement will be no more than minus 60 °C.

6.11 Durability of the polyethylene coating layer to thermal aging is evaluated by the value of the relative elongation at break after aging the samples in air at 110 °C for 100 days. For tests used samples in the form of «blades» type 1 according to GOST 11262 with lengths of 33 mm and a width of 6 mm, cut from the delaminated coating using a standard knife with no less than five pieces. Elongation at break determined on a tensile testing machine at a speed of stretching of the samples of 100 mm/min with a measuring accuracy of±2%.

For test result take the arithmetic mean value of the relative elongation at break of five samples.

6.12 Resistance of the coating penetration (indentation) determined according to GOST R 51164 (Annex E) on the pipes with a polyethylene coating or on samples cut from pipes with the diameter from 57 to 1420 mm, with plastic coating length less than 200 mm. For the tests at elevated temperature (60±2) °C using an oven for maintaining a predetermined temperature with an accuracy of ±2 °C.

6.13 resistance of the coating to the effects of abrasive loads is determined by the application B.

6.14 the Estimation of the resistance of coatings to thermal Cycling is carried out according to GOST R 52568 (Appendix C). the samples from coated pipes with open edges.

6.15 If there are unsatisfactory results of the periodic tests, repeat tests are carried out at an unsatisfactory rate at twice the number of samples. When you re obtaining negative test results of the coating process on the pipe suspended to ascertain and eliminate the causes of nonconformities indicators cover the requirements of this standard.

7 Marking, transportation and storage

7.1 Marking, transportation and storage of pipes with a polyethylene coating is carried out according to GOST 10692, normative and technical documents in the pipes, which should be reflected in the methods of handling, storage, marking and the following coverage information:

— the name of the manufacturer of insulated pipes;

— type of coverage US or MAS according to GOST 9.602;

— the type of pipe and grade of steel;

— the batch number of the coated pipes;

— date of coating application;

level of technical control on the acceptance of the products.

7.2 Transportation and storage of coated pipes shall not lead to violation of the continuity of the plastic coating.

7.3 Pipes stored under GOST 15150 in conditions 8 (ОЖ3) not more than 6 months. Pipes with polyethylene coating, which is planned more than 6 months should be protected from exposure to ultraviolet radiation with covers, canopies and other appropriate methods.

8 manufacturer’s Warranty

8.1 the Manufacturer guarantees the conformity of the polyethylene coating to the requirements of this standard within 18 months after the coating with observance of rules of carrying out of construction works in the temperature range from minus 40 °C to 50 °C, of the rules of transportation and storage of tubes with plastic coating in the temperature range from minus 45 °C to 50 °C.

Note — it is permitted to use pipes with an insulating coating after storage period: more than 18 months subject to completion of additional acceptance tests and obtain positive results in accordance with the requirements of this standard.

8.2 Guaranteed protection from external corrosion operating pipelines with polyethylene coating with the following quality indicators:

— adhesion, not less than 10 years — 35 N/cm; 20 years — 25 N/cm; 40 years — 15 N/cm;

— reduction of the transition resistance of the coating from the value of the index on finished by construction object (3,0·10Ohm·m, GOST R 51164), not more than 10 years — 80%; 20 years — 87%; 40 years — of 95%.

The application And (reference). Method of determining the gelation time of the epoxy powder compositions

Appendix A
(reference)

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* According to GOST ISO 8130.6.

A. 1 Purpose of the method

The method is intended to determine the time to gelation of the molten epoxy composition.

The essence of the method consists in heating to a predetermined temperature to a fixed volume of powder in the recess of the heating block and defining a period of time, after which it is impossible to pull the filament from the melted epoxy composition used as a primer layer in three-layer polyethylene coatings.

A. 2 Requirements for samples and accessories

A. 2.1 the Samples for testing are taken from the incoming batch powder composition. Single samples are taken from bags a shovel. Selected single samples link in the overall sample and stirred in a tightly closed dry container. The mass of the total sample should be not less than 500 g.

A. 2.2 For the tests using the following devices, materials and equipment:

— the heating unit, a sample of which with approximate dimensions is presented in figure A. 1, consisting of electric power of 500 W and a thermally insulated steel housing with polished spherical recess with a diameter of (16±0,1) mm and a curvature radius of (10±0,1) mm, located in the center of the upper side of the block;

thermometer with measurement range from 100 °C to 230 °C inserted into a hole drilled horizontally with respect to the center of the heating block below the hole of 2.0 mm;

— stopwatch or electric timer with a measuring accuracy of ±1 s;

— scoop capacity (0,25±0,01) ml. test sample in the recess of the heating block;

mixer from a material with low heat capacity in the form of metal spokes with a spherical head with a diameter of 1.0 mm, and wooden handle;

— scraper made of a softer material than the heating unit for removal of the test material out of the cavity of the heating block after the test;

— D-camphor to control the temperature of the heating block (at a test temperature of 180 °C);

— fissile material (e.g., aerosol dispersion of polytetrafluoroethylene).

Figure A. 1 — Heating unit (example)

Figure A. 1 — Heating unit (example)

A. 3 Preparation for testing

A. 3.1 the surface Temperature of the heating block with the thermostat adjusted to desired temperature (180±1) °C and stabilize for at least 10 min. the temperature Control of heating is carried out by thermometer and by placing on the surface of the block a small amount of D-camphor, which melt at this temperature.

A. 3.2 Process the recess and the surface of the heating block of fissile material.

A. 4 testing

A. 4.1 the Test is performed on two parallel samples at a temperature of (180±1) °C.

A. 4.2 use the measuring spoon pour the test sample (0,25±0,01) ml in the recess of the heating block and after complete melting of the powder include a stopwatch or timer. Mix the molten material in small circular motions with the help of a mixer. With the beginning of the thickening, stirring constantly, 2−3 with raise the mixer to a height of at least 10 mm above the molten material.

A. 4.3 turn Off the stopwatch or timer and note the time accurate to 1 second, once the filament melt begins to break down and no longer pulled from the melt. The time recorded by the timer, is the time to gelation of the epoxy composition.

A. 4.4 when the tests are removed with a scraper the subject material with the heating block without damaging its surface, and repeating the determining the time of gelation for the next test sample.

A. 5 Processing of measurement results

A. 5.1 Compares the results of two measurements. If the gelling time of the two measurements differs by not more than 5% smaller values, then calculate and record the arithmetic mean value.

A. 5.2 If the difference between the two results is more than 5%, spend the third dimension, then calculate and record the arithmetic mean value of three results with an accuracy of 1 C.

Annex B (reference). Method of determining resistance of coatings to abrasion

Appendix B
(reference)

B. 1 Purpose of the method

Method involves determination of the resistance of coatings to abrasion of dry and moist abrasive material under a given load.

B. 2 testing Apparatus and materials

B. 2.1 the Samples for testing are made on the line insulation of pipes of small diameter (from 57 to 426 mm).

B. 2.2 For testing use setting, an example of which is presented in figure B. 1. The unit provides abrasion coating rotating pipe at a static load of 0.23 kg/cm. The peripheral speed of rotation of the pipe is 25 m/min.

Figure B. 1 — diagram of an apparatus for testing coating resistance to abrasion

1 — tube with coating; 2 — abrasive; 3 — holder; 4 platform; 5 — the load

Figure B. 1 — diagram of an apparatus for testing coating resistance to abrasion

B. 2.3 In an abrasive used silicon waterproof sandpaper churchyard 5009 grit abrasive material N 6. The thickness of the coating is measured by thickness gauge. For wetting the coating applied to the electrolyte solution containing 500 mg/l 500 mg/l in distilled water.

B. 3 testing

B. 3.1 the Test is performed on two parallel samples. Prior to testing, measure the coating thickness with a magnetic thickness gauge with a measuring accuracy of ±0,1 mm.

B. 3.2, the Pipe cover 1 is fixed to install for testing. To the surface of the coating is pressed against sandpaper 2 size of 1 cm, glued to the holder 3. On the platform 4 sets load 5 a mass of 0.23 kg.

B. 3.3 Tubes attach rotational movement. The area of contact of the sandpaper with the surface of the coating 1 cm(square section 10x10 mm). On each sheet abrasive cloth is carried out one test. The duration of abrasion under load to determine condition of passing each point of the abrasive around the circumference of the pipe a distance of 150 m.

B. 3.4 When tested in wet conditions the friction at the area of contact of the coating with the abrasive from the dropper serves the electrolyte solution containing 500 mg/l 500 mg/l .

B. 4 Processing of test results

B. 4.1 the abrasion Resistance is evaluated by the reduction of the thickness of the coating. Compare results on two pipes and if the results differ by no more than 10% lower value, calculate and record the arithmetic mean value.

B. 4.2 thickness Reduction is allowed up to 25% of the original value.