GOST R 56403-2015

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  ГОСТ Р 56403-2015

GOST R 56403−2015 Trunk pipeline transport of oil and oil products. Steel welded pipes. Technical specifications

GOST R 56403−2015

Group B62

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

Trunk pipeline transportation of oil and oil products

PIPES STEEL WELDED

Technical specifications

Trunk pipelines for oil and oil products transportation. Welded steel pipes. Specifications

GCS 77.140.75
OKP 13 0300

Date of implementation 2016−01−01

Foreword

1 DEVELOPED by the Limited Liability Company «Research Institute of Oil and Oil Products Transportation» (LLC «Research Institute of TNN») and Limited Liability Company «ChTPZ-Engineering» (LLC «ChTPZ-Engineering»)

2 Submitted by Subcommittee SC 7 «Trunk pipeline transport of oil and petroleum products» of the Technical Committee for Standardization of TC 23 «Oil and Gas Industry"

3 APPROVED AND ENTRY INTO FORCE The Order of the Federal Agency for Technical Regulation and Metrology of May 15, 2015 N 355-st

4 INTRODUCED FOR THE FIRST TIME

5 REVISION. January 2017


The rules for the application of this standard are set out in Article 26 of Federal Law No. 162-FZ of June 29, 2015, «On Standardization in the Russian Federation.» The information on changes to this standard is published in the annual (as of January 1 of the current year) information index «National Standards», and the official text of the amendments and amendments is published in the monthly information index «National Standards». In case of revision (replacement) or cancellation of this standard, a corresponding notice will be published in the next issue of the monthly information index «National Standards».

Introduction

In this standard, based on the experience of operating main oil pipelines and oil product pipelines, modern achievements in steel production technology, rolled products and pipes, analysis of technical requirements of the national standards of the Russian Federation GOST R 52079 «Steel welded pipes for gas mains, oil pipelines and oil products», GOST R ISO 3183 «Pipes Steel for pipelines of the oil and gas industry. General specifications «, as well as international standards API Spec. 5L «Pipeline Piping Specification», ISO 3183 * «Oil and Gas Industry — Steel Pipes for Pipeline Transport Systems» sets requirements for electric steel welded pipes.

This standard introduces a number of requirements that distinguish it from the existing in the Russian Federation standards for pipes for main oil pipelines, namely:

— requirements for the chemical composition, weldability parameters and microstructure of the metal for pipes of various designs have been introduced;

— the required values of the toughness of the base metal and welded pipe joints have been increased;

— additional requirements were introduced to assess the visco-plastic characteristics of the metal pipes;

— additional requirements are imposed on the quality of the pipe surface.

1 area of use

This standard applies to steel welded longitudinal welded pipes with an outside diameter of 114 to 1220 mm designed for construction, repair and reconstruction of main oil pipelines and oil product pipelines transporting non-corrosive oil and oil products at operating pressure up to 9.8 MPa.

This standard does not apply to offshore pipelines.

2 Relevance

2.1 This International Standard applies units of the international SI system.

2.2 To ensure compliance with the requirements of this standard, a quality management system conforming to GOST ISO 9001 must be applied.

The manufacturer must ensure that the products meet the requirements of this standard. The consumer has the right to ascertain that the manufacturer fulfills the requirements and reject any product that does not meet these requirements.

2.3 When mastering the manufacture of pipes for this standard, the requirements of GOST R 15.201−2000 must be taken into account.

2.4 Measured or calculated values shall be rounded to the last significant figures specified in this standard.

3 Normative references

Normative references to the following standards are used in this standard:
GOST 25.506−85 Calculations and strength tests. Methods of mechanical testing of metals. Determination of fracture toughness characteristics (fracture toughness) under static loading
GOST 162−90 Shafting depth meters. Technical specifications
GOST 166−89 (ISO 3599−76) Calipers. Technical specifications
Measuring rulers metal. Technical specifications
GOST 1497−84 Metals. Methods of tensile testing
GOST 1778−70 Steel. Metallographic methods for determining nonmetallic inclusions
GOST 2601−84 Welding of metals. Terms and definitions of basic concepts
GOST 2999−75 Metals and alloys. Method for measuring hardness by Vickers
GOST 3845−75 Pipes made of metal. Hydraulic test methods
Goniometers with nonius. GOST 5378−88. Technical specifications
GOST 5639−82 Steels and alloys. Methods for the detection and determination of grain size
GOST 5640−68 Steel. Metallographic method for estimating the microstructure of sheets and tape
GOST 6507−90 Micrometers. Technical specifications
GOST 6996−66 Welded joints. Methods for determining mechanical properties
Measuring Tape Metal. Technical specifications
GOST 7565−81 Cast iron, steel and alloys. Method of sampling for chemical composition determination
GOST 8026−92 Testing rulers. Technical specifications
GOST 8695−75 Pipes. Flattening test method
GOST 9454−78 Metals. Test method for impact bending at low, ambient and elevated temperatures
GOST 10006−80 Pipes made of metal. Tensile test method
GOST 10692−80 Pipes steel, cast iron and connecting parts to them. Acceptance, marking, packaging, transportation and storage
GOST 11358−89 Thickness gauges and stokomery indicator with a division price of 0.01 and 0.1 mm. Technical specifications
Steel alloys and high alloy. Methods for determination of carbon
Steel alloys and high alloy. Methods for determination of sulfur
Alloyed and highly alloyed steels. Methods for determination of silicon
Steel alloyed and highly alloyed. Methods for determination of phosphorus
GOST 12348−78 Steel alloyed and highly alloyed. Methods for the determination of manganese
Steel alloyed and highly alloyed. Methods for determination of tungsten
Steel alloys and high alloy. Methods for the determination of chromium
Steel alloys and high alloy. Methods for determination of vanadium
Steel alloyed and highly alloyed. Methods for the determination of nickel
Steel alloyed and highly alloyed. Methods for determination of molybdenum
Steel alloys and high alloy. Methods for determination of copper
Steel alloyed and highly alloyed. Methods for determination of titanium
Steel alloys and high alloy. Methods for determination of aluminum
Steel alloyed and highly alloyed. Methods for the determination of arsenic
Steel alloyed and highly alloyed. Methods for determination of nitrogen
Steel alloys and high alloy. Methods for determination of boron
Steel alloyed and highly alloyed. Methods for determining niobium
Steel alloys and high alloy. Methods for determination of microimpurities of antimony, lead, tin, zinc and cadmium
GOST 17745−90 Steels and alloys. Methods for determination of gases
GOST 18895−97 Steel. Method of photoelectric spectral analysis
Rolled sheet hot-rolled. Assortment
Rolled ferrous metals. Terms and definitions of surface defects
Carbon steel and cast iron, unalloyed. General requirements for analysis methods
Carbon steel and cast iron, unalloyed. Methods for determination of total carbon and graphite
Carbon steel and cast iron, unalloyed. Methods for determination of sulfur
Carbon steel and cast iron, unalloyed. Methods for determination of phosphorus
Carbon steel and cast iron, unalloyed. Methods for determination of silicon
Carbon steel and cast iron, non-alloy. Methods for the determination of manganese
Carbon steel and cast iron, unalloyed. Methods for the determination of arsenic
Carbon steel and cast iron, unalloyed. Methods for the determination of chromium
Carbon steel and cast iron, non-alloy. Methods for determination of copper
Carbon steel and cast iron, unalloyed. Methods for the determination of nickel
Carbon steel and cast iron, unalloyed. Methods for determination of aluminum
Carbon steel and cast iron, non-alloy. Methods for determination of titanium
Carbon steel and cast iron, unalloyed. Methods for determination of vanadium
GOST 28033−89 Steel. X-ray fluorescence analysis method
GOST 30432−96 Pipes made of metal. Methods for sampling, blanks and samples for mechanical and technological tests
GOST 30456−97 Metal products. Rolled sheet and steel pipes. Methods of testing for impact bending
GOST ISO 9001−2011 Quality management systems. Requirements
GOST R 15.201−2000 System for the development and production of products for production. Production of industrial and technical purpose. The order of development and production for production
GOST R 54795−2011 Non-destructive testing. Qualification and certification of personnel. Primary requirements
GOST R ISO 3183−2009 Pipes steel for pipelines of oil and gas industry. General specifications
GOST R ISO 4967−2009 Definitions of the content of non-metallic inclusions. Metallographic method using reference scales
GOST R ISO 10543−99 Seamless and welded hot and cold welded steel pipes. Method of ultrasonic thickness measurement

NOTE — When using this standard it is advisable to check the operation of reference standards in the public information system — on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or on the annual information index «National Standards», which was published as of January 1 of this year, and on the issues of the monthly information index «National Standards» for the current year. If you replace the reference standard for which an undated reference is given, then the current version of this standard is recommended, taking into account all changes made to this version. If the reference standard, to which the reference is dated, is replaced, then the version of this standard with the above approval year is recommended. If, following the approval of this standard, a reference is made to the reference standard for which the reference is dated, a change affecting the provision referred to is made, it is recommended that this provision be applied without regard to this change. If the reference standard is abolished without replacement, then the provision in which it is referenced is recommended to apply in a part that does not affect this reference.

4 Terms and definitions

In this standard terms are used in accordance with GOST 2601, GOST 21014, GOST 1497, and also the following terms with the corresponding definitions:

4.1 dent: A defect in the form of an indentation of an arbitrary shape, leading to a local decrease in the pipe cross-section.

4.2 pipe defect: Deviation from the pipe quality specified in regulatory documents.

4.3 scuff: A surface defect, which is an indentation of an irregular shape and an arbitrary direction resulting from mechanical damage, including when storing and transporting the metal.

4.4 Bore of the pipe body: Reducing the wall thickness, formed when removing the convexity of welded joints at the pipe ends with a cutting tool.

4.5 Class of pipe strength: The strength of the pipe metal, estimated by the temporary resistance and denoted by the symbols from K34 to K60.

4.6 Non-corrosive oil and oil products: Petroleum and petroleum products that cause uniform corrosion of the unprotected pipe wall at a speed of no more than 0.1 mm per year.

4.7 nonmetallic inclusions: Defects of metallurgical origin in metal pipes of various shapes in the form of nonmetallic inclusions.

4.8 Nondestructive testing: Control of the continuity of metal by physical methods that do not destroy the metal.

4.9 fibration: Internal disruption of metal continuity in the longitudinal and transverse direction, separating the metal into layers of technological origin.

4.10 Heat treatment of pipes: Heat treatment of pipes to improve the plastic and ductile properties of the base metal and welded pipe joints.

4.11 Expansion of pipes: Hydraulic or hydromechanical calibration of pipes on the expander by plastic deformation of the wall to obtain the standard geometric parameters of the pipes.

4.12 electronic pipe passport: A structured data list containing information about the product, including those recorded in the production process stages, and intended for use in the pipe life-cycle management systems.

5 Notations and abbreviations

The following notations and abbreviations are used in this standard:

AUZK — automatic ultrasonic testing;

VIC — visual and measuring control;

HAZ — zone of thermal influence;

IPG is a test of a falling load;

OS — steric oxides;

OT — point oxides;

RGC — X-ray inspection (with the help of films);

RUZK — manual ultrasonic testing;

RTK — X-ray television control;

CH — silicates are not deformed;

SP — plastic silicates;

CX — silicates are fragile;

Ultrasonic testing;

D  — The nominal outside diameter of the pipe, mm.

6 Strength classes and delivery status

6.1 Pipes are made by strength classes K34, K38, K42, K48, K50, K52, K54, K55, K56, K60.

6.2 According to the manufacturing method, the pipes are divided into two types:

— Type 1 — pipes from 114 to 630 mm in diameter welded by high-frequency welding, with one longitudinal seam;

— type 2 — pipes from 530 to 1220 mm in diameter welded by submerged arc welding, with one or two longitudinal seams.

6.3 Three pipe quality levels are established:

— level of quality I — pipes in the usual design;

— level of quality II — pipes in cold-resistant design;

— level of quality III — pipes with increased performance characteristics.

The correspondence between the strength class of pipes and the quality level is established in Table 1.


Table 1 — Pipe strength classes and quality levels

Pipe strength class	Quality level
I	II	III
K34	+	-	-
K38	+	-	-
K42	+	-	-
K48	+	-	-
C50	+	+	-
K52	+	+	-
K54	+	+	-
K55	+	+	-
K56	+	+	+
K60	+	+	+
Notes 1 Pipes of type 1 of quality level III are not manufactured. 2 Pipes of type 2 of quality level II are manufactured with strength classes of at least K52. 3 The «+" sign indicates that the corresponding strength class is applied, the «-" sign does not apply.

6.4. Type 1 pipes shall be manufactured using high frequency welding.

The pipes are subjected to volumetric heat treatment or local heat treatment of the welded joint.

6.5 Type 2 pipes shall be manufactured using double-sided arc welding under a flux along a continuous process joint without additional heat treatment.

Upon agreement between the manufacturer and the consumer, heat treatment of the pipes is allowed.

6.6 Two-seam type 2 pipes are manufactured from:

— two sheets of one heat and one delivery condition (type of heat treatment);

— two sheets of different melts and one delivery condition (type of heat treatment), the difference in the actual values of the mechanical properties (temporary tensile strength and yield strength) does not exceed 50 MPa, according to the data in the quality documents.

6.7 The conditions of operation, storage, transportation and construction and installation works, in which the performance properties of pipes manufactured in accordance with the requirements of this standard are preserved, are given in Appendix A.

7 Information to be provided by the consumer

7.1 The following information should be provided by the consumer:

— type of pipe;

— pipe dimensions (nominal outside diameter and wall thickness);

— pipe strength class;

— level of pipe quality;

— length of the pipe (when ordering measuring pipes);

— indication of the use of the pipe as part of the underwater pipeline transition.

7.2 The pipe designation in the order should contain the following parameters: pipe type designation, nominal outside diameter and nominal pipe wall thickness, pipe strength class, pipe quality level, and length (when ordering the measuring tube).

Examples of symbols

1 Pipe type 1, external diameter 219 mm, with wall thickness 4,0 mm, strength class K38, quality level I, unlimited length:

Pipe 1−219х4,0-К38-I.

2 Pipe type 2, external diameter 820 mm, with wall thickness 10.0 mm, strength class K52, quality level I, measuring length 11.3 m:

Pipe 2−820х10,0-К52-I, L = 11,3.

3 Pipe type 2, outer diameter 1020 mm, with wall thickness 14.0 mm, strength class K56, quality level II, unlimited length, designed for underwater pipeline construction:

Pipe 2−1020x14,0-K56-II, PP.

8 Production

8.1 Rolled or sheet products used as a raw material for the production of pipes shall be made from fully deoxidized (calm) steel obtained by an oxygen converter or an electric steelmaking process.

8.2. The rolling must be made of continuously cast billets and be in a hot-rolled, normalized state, after thermal hardening (tempering with subsequent tempering), controlled rolling or after controlled rolling with accelerated cooling.

8.3 Pipes of type 2 shall be manufactured from sheet metal that has passed through ultrasonic testing with 100% scanning of the area of each sheet.

8.4 Pipes of quality level III shall be manufactured from rolled products obtained by controlled rolling or controlled rolling with accelerated cooling.

8.5. On the surface of the rolled product intended for the manufacture of pipes, there should be no flaws, captivity, cracks, rolled up fines and crusts, rolled scale and other contaminants.

The depth of scratches, scratches, shells, scoring should not exceed 0.2 mm.

Do not allow stratifications that extend to the surface and end areas.

8.6 Rolled and welded materials used in the manufacture of pipes must have quality documents and be subject to input control.

8.7 Any lubricants that contaminate the seam cutting area or adjacent areas should be removed before the welds are made.

8.8 Type 2 pipes shall be expandered along the entire length. Plastic deformation along the perimeter of the pipe in any section should be in the range from 0.3% to 1.2%.

For expansion, hydromechanical expanders should be used.

9 Acceptance Criteria

9.1 Assortment

9.1.1 Pipes are produced in an unlimited and dimensional length.

Length of non-dimensional pipes should be from 10.50 to 12.20 m. Production of up to 10% (by weight) of pipes with a length of 10.00 to 10.49 m is allowed.

Upon agreement with the customer, the delivery of pipes up to 18.3 m in length is allowed.

As agreed with the customer, two-tube sections up to 24.00 m long, obtained by butt welding of two pipes are supplied.

The length of the measuring tubes must be:

— from 6.00 to 12.20 m with a diameter from 114 to 219 mm inclusive;

— from 10.00 to 12.20 m with a diameter exceeding 219 mm.

The deviation of the length of the measuring pipes from the nominal value is not more than 200 mm.

9.1.2 The assortment and the theoretical mass of the pipes are given in Table 2.

The theoretical mass M of one running meter of the pipe, kg / m, is calculated by the formula

M = 0.02466 (D -S ) S , (1)

where D  — The nominal outside diameter of the pipe, mm;

S  — nominal pipe wall thickness, mm.

In the manufacture of pipes type 2, the theoretical mass is increased by 1% due to the convexity of the seam (sutures).

By agreement between the manufacturer and the consumer, pipes with an intermediate wall thickness and a diameter within the limits of Table 2 are allowed.


Table 2 — Grade and Theoretical Pipe Weight

Nominal outside the diameter pipes, mm	Theoretical mass of 1 m of pipe, kg, at nominal wall thickness, mm
3	4	5	6th	7th	8	9	10	eleven	12	13	14	15	16	17th	18	19	20	21
114	8.21	10.85	13.44	15.98	18.47	20.91	-	-	-	-	-	-	-	-	-	-	-	-	-
121	8.73	11.54	14.30	17.02	19.68	22.29	24.86	27.37	-	-	-	-	-	-	-	-	-	-	-
133	9.62	12.72	15.78	18.79	21.75	24.66	27.52	30.33	-	-	-	-	-	-	-	-	-	-	-
140	10.14	13.42	16.65	19.83	22.96	26.04	29.07	32.06	34.99	37.87	40.71	-	-	-	-	-	-	-	-
159	11.54	15.29	18.99	22.64	26.24	29.79	33.29	36.74	40.15	43.50	46.80	-	-	-	-	-	-	-	-
168	12.21	16.18	20.10	23.97	27.79	31.57	35.29	38.96	42.59	46.16	49.69	-	-	-	-	-	-	-	-
219	15.98	21.21	26.39	31.52	36.60	41.63	46.61	51.54	56,42	61.26	66.04	70.77	-	-	-	-	-	-	-
245	-	23.77	29.59	35.36	41.09	46.76	52.38	57.95	63.47	68.95	74.37	79.75	-	-	-	-	-	-	-
273	-	26.53	33.04	39.51	45.92	52.28	58.59	64.86	71.07	77.24	83.35	89,42	-	-	-	-	-	-	-
325	-	31.66	39.46	47.20	54.89	62.54	70.13	77.68	85.18	92.62	100.03	107.38	114.68	121.93	-	-	-	-	-
356	-	34.72	43.28	51.79	60.24	68.65	77.01	85.32	93.58	101.80	109.96	118.07	126.14	134.15	-	-	-	-	-
377	-	-	45.87	54.89	63.87	72.80	81.68	90.51	99.28	108.01	116.70	125.33	133.91	142.45	-	-	-	-	-
426	-	-	51.91	62.15	72.33	82.47	92.55	102.59	112.57	122.51	132.41	142.25	152.04	161.78	-	-	-	-	-
530	-	-	-	77.53	90.29	$ 102,99	115,64	128.24	140.79	153.30	165.75	178.15	190.50	202,80	215.06	227.27	239.42	251.53	263.59
630	-	-	-	-	107.55	122.72	137.83	152,90	167.91	182.88	197,80	212.67	227.49	242.26	257.00	271.66	286.28	300.85	315.38
720	-	-	-	-	-	140.47	157,80	175.09	192.32	209.51	226.65	243.74	260.78	277.77	294,72	311.60	328.45	345.24	362.00
820	-	-	-	-	-	160.20	180.00	199.75	219.46	239.12	258.71	278.28	297.77	317.23	336.63	356.00	375.30	394.56	413.77
1020	-	-	-	-	-	-	224.38	249.07	273.70	298.29	322.83	347.31	371.75	396.14	420,48	444.77	469.04	493.21	517.34
1220	-	-	-	-	-	-	-	298.39	327.95	357.47	386.94	416.36	445.73	475.05	504.32	533.54	562.72	591.84	620.91

End of Table 2

Nominal outside the diameter pipes, mm	Theoretical mass of 1 m of pipe, kg, at nominal wall thickness, mm
22	23	24	25	26th	27th	28	29	thirty	31	32	33	34	35
530	275.60	287.56	299.47	311.33	323.14	334.91	346.62	358.29	369.90	381.47	-	-	-	-
630	329.85	344.28	358.66	372.98	387.26	401.49	415.67	429.80	443.88	457.91	471.89	485.83	-	-
720	378.68	395.33	411,92	428.47	445.00	461.41	477.81	494.16	510.46	526,71	542.91	559.07	575.17	591.22
820	432.93	452.04	471.11	490.12	509.08	528.00	546.86	565.68	584.44	603.16	621.83	640.44	659.01	677.53
1020	541.44	565.48	589.47	613.42	637.31	661.16	685.00	708.70	732.40	756.05	779.65	803.20	826.70	850.15
1220	649.94	678.92	707.84	736.72	765.55	794.32	823.05	851.73	880.36	908.94	937.47	965.96	994.39	1022.77

9.1.3 Limit deviations in the wall thickness of the pipes:

— The positive tolerance must comply with the tolerances in accordance with GOST 19903 for the maximum width of rolled normal accuracy;

— the negative tolerance for pipes of type 1 must comply with the tolerances in accordance with GOST 19903 for the maximum width of rolled normal accuracy;

— The negative tolerance for type 2 pipes shall not exceed 5% of the nominal wall thickness, but not more than 0.8 mm.

9.1.4 The maximum deviation of the nominal outside diameter of the pipe body shall correspond to the values given in Table 3.


Table 3 — Limit deviations of the nominal outer diameter of the pipe body

In millimeters

Nominal OD	Limit Deviation
From 114 to 168 inclusive.	± 1.3
St. 168 to 426 inclusive.	± 2.0
Holy 426 to 1220 inclusive.	± 3.0

9.1.5 Limit deviations of the nominal outer diameter of pipe ends at a length of at least 200 mm from the end shall comply with the values given in Table 4.


Table 4 — Limit deviations of the nominal outer diameter of the pipe ends

In millimeters

Nominal OD	Limit Deviation
From 114 to 168 inclusive.	± 1.3
St. 168 to 820 inclusive	± 1.5
820 to 1220 inclusive.	± 1.6

9.1.6 The ovality of the ends of Type 1 pipes shall not cause the outer diameter to exceed the limits given in Table 3.

The ovality of the ends of pipes of type 2, defined as the difference between the largest and smallest diameters, should not exceed the following values:

— 0.010 D  — for pipes with wall thickness up to 20.0 mm inclusive;

— 0.008 D  — for pipes with a wall thickness of more than 20.0 mm.

9.1.7 The deviation from the straightness of the pipes shall not exceed 1.5 mm per 1 m of length. The total deviation from the straightness of the pipes should not exceed 0.2% of the length of the pipe.

9.1.8 The deviation from the perpendicularity of the end of the pipe relative to the generatrix (the cut cut-off) shall not exceed the following values:

— 1.0 mm — for pipes up to 219 mm in diameter;

— 1,5 mm — for pipes with a diameter exceeding 219 to 426 mm inclusive;

— 1.6 mm — for pipes with a diameter of more than 426 mm.

9.1.9 The shape and dimensions of the cutting of the edges of the pipe ends with a wall thickness of more than 5.0 mm for welding shall be as specified in Figure 1 and Table 5.

The permissible deviation of the B dimension (see Figure 1) in the weld zone (40 mm on either side of the weld axis) is ± 1.5 mm.

Figure 1 — Shape and size of pipe end cutting

Figure 1 — Shape and size of pipe end cutting

Table 5 — Size of B, depending on the thickness of the pipe wall

In millimeters

Nominal pipe wall thickness, mm	Value B, mm
From 15.0 to 19.0 inclusive.	9
St. 19.0 to 21.0 inclusive.	10
St. 21.0 to 32.0 inclusive	12
St. 32.0	16

9.1.10. The deviation of the outer surface profile of pipes of type 2 from the circumference along the body of the pipe and in the welded joint zone at the end sections of 200 mm from the ends and along the arc of the perimeter of 200 mm should not exceed 0.0015 D .

9.1.11 The relative edge displacement in the welded joint shall not exceed the following values:

— 1.0 mm — for all pipes of type 1 and pipes of type 2 with a wall thickness of up to 10.0 mm;

— 10% of the nominal wall thickness — for pipes of type 2 with a wall thickness of 10.0 to 20.0 mm inclusive;

— 2.0 mm — for pipes type 2 with a wall thickness of more than 20.0 mm.

9.1.12 The outer and inner weld bead of Type 1 pipes shall be removed. The height of the residue of the burr should not exceed 0.5 mm.

In the place of removal of the grate, the wall of the pipe is allowed to thin out, not removing the thickness beyond the limits of the minus tolerance.

9.1.13 The convexity of external and internal welds of pipes of type 2 shall be within the limits of:

— from 0,5 to 2,5 mm — for pipes with wall thickness up to 10,0 mm inclusive;

— from 0,5 to 3,0 mm — for pipes with a wall thickness exceeding 10,0 mm.

9.1.14 At the ends of pipes of type 2 at a length of at least 150 mm but not more than 200 mm, from the ends of the end the convexity of the internal weld shall be removed to a height of 0 to 0.5 mm.

As agreed between the consumer and the manufacturer, the convexity of the outer welded joint at the ends of the pipes at a length of not less than 150 mm, but not more than 200 mm, from the ends to a height of 0 to 0.5 mm, is removed.

Cutting the body of the pipe when removing the convexity of welded joints is not allowed.

Removal of the convexity of welded joints should be done before hydrotests and non-destructive testing of the weld at the ends of the pipes.

9.1.15 The width of the convexity of welded joints of pipes of type 2 shall be no more than:

— 20.0 mm — for pipes with wall thickness up to 10.0 mm;

— 25.0 mm — for pipes with a wall thickness of 10.0 to 16.0 mm inclusive;

— 30.0 mm — for pipes with a wall thickness exceeding 16.0 to 27.0 mm inclusive;

— 35.0 mm — for pipes with a wall thickness exceeding 27.0 mm.

In the repair area, the width of the convexity of the weld seam may be increased by 4.0 mm.

Grinding of the convexity of the weld to bring the width of the welded seams to the required parameters is not allowed.

9.1.16 The displacement of the axes of the external and internal joints (n) at the ends of the pipes of type 2 (figure 2) should be no more than:

— 3.0 mm with a wall thickness of up to 10.0 mm inclusive with an overlap of at least 1.5 mm;

— 4.0 mm with a wall thickness of more than 10.0 mm with overlap of joints of at least 2.0 mm.

Figure 2 — Offset of the axes of the outer and inner joints of pipes type 2

Figure 2 — Offset of the axes of the outer and inner joints of pipes type 2

9.2 Chemical composition of metal pipes

9.2.1 Chemical composition of metal pipes, carbon equivalent values C and a crack resistance parameter P , characterizing the weldability of steel, must meet the requirements of Table 6.

9.2.2 Calculation of carbon equivalent values C and a crack resistance parameter P , characterizing the weldability of steel, are carried out according to the formulas:

, (2)

, (3)

where C, Mn, Cr, Mo, V, Cu, Ni and Si are the mass fractions in steel, respectively carbon, manganese, chromium, molybdenum, vanadium, copper, nickel and silicon,%.

The parameter P It is used for steels with a mass fraction of carbon up to 0.12% inclusive.


Table 6 — Mass fraction of chemical elements in steel

Quality level	Mass fraction of chemical elements,%, not more than															C	P
C	Mn	Si	S	P	N	AI	Nb	V	Ti	Mo	Ni	Cu	Cr	B
I	0.20	1.70	0.60	0.020	0.020	0.012	0.05	0.080	0.08	0.04	0.25	0.35	0.35	0.20	0,001	0.43	0.24
II	0.12	1.85	0.60	0.010	0,015	0.010	0.05	0.11	0.08	0.04	0.25	0.35	0.35	0.20	0,001	0.42	0.23
III	0.08	1.65	0.60	0.005	0.012	0.009	0.05	0.080	0.08	0.04	0.25	0.35	0.35	0.20	0,001	0.41	0.21
Notes 1 In metal pipes of quality level I, made of low-alloy steel, the mass fractions of carbon and sulfur should not exceed 0.18% and 0.015%, respectively. 2 The total mass fraction of niobium, vanadium and titanium in the metal of pipes of all quality levels should not exceed 0.15%. 3 In the steels of controlled rolling, the mass fraction of niobium should be not less than 0.02%.

9.3 Microstructure of Pipe Metal

9.3.1 Metal pipes with a diameter of 530 mm or more shall be subjected to microstructure control.

9.3.2 Pollution by non-metallic inclusions of metal pipes of quality levels I and II shall not exceed the values given in Table 7.


Table 7 — Non-metallic inclusions in the main metal of pipes of quality level I and II

Type of inclusion		Contamination
by average score	on the maximum score
Sulphides		2.5 / 2.0	3.0
Oxides	OS	3.0 / 2.5	4.0
FROM	3.0 / 2.5	4.0
Silicates	CX	3.0 / 2.5	4.0
SP	3.0 / 2.5	4.0
CH	3.0 / 2.5	4.0
NOTE — The numerator gives the average score for the metal of pipes of quality level I, in the denominator for metal pipes of quality level II.

The contamination of metal pipes of quality level III should not exceed the values given in Table 8.


Table 8 — Non-metallic inclusions in the main metal of quality level III pipes

Type of inclusion		Contamination
by average score	on the maximum score
Sulphides		1.0	1.5
Oxides	OS	2.0	2.5
FROM	2.0	2.5
Silicates	CX	2.0	2.5
SP	2.0	2.5
CH	2.5	3.0

9.3.3 The banding of a metal structure with a ferrite-pearlite structure should not exceed a score of 3.

9.3.4 The value of the actual grain of a metal with a ferritic perlite structure should be:

— not larger than 7 numbers for pipes of quality level I;

— not larger than 8 numbers for pipes of quality level II;

— not larger than 9 rooms for pipes of quality level III.

The norms for estimating the value of the actual grain of a metal with a different structure are established by agreement between the manufacturer and the consumer.

9.4 Mechanical and technological properties of metal pipes and welded joints

9.4.1 The mechanical properties of the base metal of the pipes, determined from the tensile test, shall comply with the values given in Table 9.

9.4.2 The relative uniform elongation of the base metal of the quality III pipe shall be not less than 6%.

The relative narrowing of the cross-section of the round samples of the base metal of the quality III pipes should be at least 70%.

9.4.3 The hardness of the base metal of the pipes shall not be more than 250 HV10.

9.4.4 The temporary resistance of welded joints of pipes when testing flat specimens with seams or burrs removed shall be not less than the standard value established for the base metal in Table 9.


Table 9 — Mechanical properties of metal pipes

Pipe strength class	Temporary resistance , MPa	Yield strength , MPa	Relative extension ,%
not less than
K34	335	206	24
K38	375	235	22
K42	410	245	21
K48	470	265	21
C50	490	345	20
K52	510	355	20
K54	530	380	20
K55	540	390	20
K56	550	410	20
K60	590	460	20

9.4.5 The maximum actual values of the time resistance should not exceed the established norms by more than 108 MPa for strength classes up to K55 and more than 98 MPa for strength classes of K55 and more.

9.4.6 The ratio of the actual yield strength to the temporary resistance (/ ) of the main metal pipes:

— for pipes type 1 — not more than 0.90;

— for pipes of type 2 of strength class up to K52 inclusive, not more than 0.87;

— for pipes of type 2 of strength class above K52 not more than 0.90.

9.4.7 Welded joints of pipes with a diameter of less than 530 mm shall withstand the flattening test. Flattening of pipes should be carried out to a distance equal to 2/3 of the nominal outer diameter, between flattening planes without the appearance of cracks, tears and segregations visible in the welded joint and base metal visible to the naked eye.

9.4.8 Welded joints of pipes with a diameter of 530 mm or more shall withstand the static bending test. Flat specimens of welded joints, with transverse joints or burrs removed, should withstand the bend at an angle of up to 120 ° without cracking and prolonged tears. Single tears of no more than 3.0 mm and a depth of not more than 12.5% of the sample thickness are allowed.

9.4.9 The hardness of the weld metal and the HAZ (for type 2 pipes) shall not be more than 260 HV10.

9.5 Characteristics of the resistance of metal to pipes and welded joints

9.5.1 For pipes of quality levels I and II, the toughness of the base metal and the welded joint metal of pipes with a wall thickness of 6.0 mm or more, determined from the results of testing samples with a concentrator of the form V (KCV) for impact bending, and the proportion of the viscous component in the break in the samples of the parent metal, determined by the results of the IPG, should correspond to the values given in Table 10.


Table 10 — Impact strength and the proportion of the viscous constituent of the base metal of the quality I and II pipes

Diameter of pipes, mm	Impact strength KCV, J / cm		The proportion of the viscous component in the fracture of the samples at IPG,%
base metal	welded joint
Not less than
From 114 to 426 inclusive.	34	29	-
Holy 426 to 630 inclusive.	59	39	50
Holy 630 to 920 inclusive.	78	44	60
St. 920 to 1220 inclusive.	88	49	80

Tests for impact bending of the base metal and welded joints, as well as the IPG of the base metal of the quality level I pipes, should be carried out at minus 5 ° C, and quality II pipes at -20 ° C.

9.5.2 For pipes of quality level III, the toughness of the base metal and the weld metal, determined from the test results of the specimen with a concentrator of the form V (KCV) for impact bending, and the proportion of the viscous component in the fracture of the base metal samples determined by the results of the IPG, the values given in Table 11.


Table 11 — Impact strength and the proportion of the viscous constituent of the base metal of the quality level pipes III

Diameter of pipes, mm	Impact strength KCV, J / cm		The proportion of the viscous component in the fracture of the samples at IPG,%
base metal	welded joint
Not less than
From 530 to 630 inclusive.	98	44	60
Holy 630 to 920 inclusive.	118	49	70
St. 920 to 1220 inclusive.	137	54	90

Tests on impact bending of the base metal and welded joints of pipes should be carried out at a temperature of minus 40 ° C.

The IPG of the base metal should be carried out at a temperature of minus 20 ° C.

9.5.3 Base metal and welded joints (center of weld and heat affected zone) of quality III pipe shall be subjected to fracture toughness tests at minus 20 ° C. The opening at the tip of the crack (CTOD) should be at least 0.2 mm for the base metal and at least 0.15 mm for the welded joint.

9.6. Hydraulic pressure tests

9.6.1 Each pipe shall be tested by internal hydraulic pressure. The parameters of the hydraulic test are recorded in the diagram.

9.6.2 Pipes, when hydraulic tests have revealed leaks, sweats, changes in shape or swelling, are considered inconsistent with this standard and discarded.

9.7 Surface condition and defects in welded joints of pipes

9.7.1 Surface quality

9.7.1.1. On the outer and inner surfaces of the base metal, there should be no flaws, captures, cracks, rolled up fines and crusts, rolled scale and other contaminants.

The depth of scratches, scratches, shells, scoring should not exceed 0.2 mm.

9.7.1.2. Bundles that overlap external and internal surfaces and end sections are not allowed.

9.7.1.3 Dents greater than 3.2 mm shall not be allowed on the surface of the pipes.

Do not allow dents of any size with mechanical damage to the metal surface and dents on the weld seam.

9.7.1.4 The length of dents in any direction shall not exceed 50% of the nominal outside diameter of the pipe. Dents greater than 1.5 mm deep located at a distance of less than 40 mm from the axis of the weld and / or less than 40 mm from the end of the pipe are not allowed.

The depth of the dent is measured as the gap between the deepest point of the dent and the continuation of the contour of the pipe.

Correction of dents and grinding of mechanical damages in dents are not allowed.

9.7.2 Assessment of the quality of the base metal and welded joints of pipes by physical methods

9.7.2.1 In the basic metal of pipes, no delamination is allowed, the dimensions of which are greater than those indicated in Table 12.


Table 12 — Maximum sizes of bundles

Pipe quality level	Area, mm	Length in any direction, mm
I, II	2500	55
III	1500	45

Each stratification of 25 mm or more in length should be more than 500 mm from the next.

The chains of bundles with a total length exceeding 55 mm are not allowed. A strand is considered to be a stratification up to 25 mm, spaced from each other at a distance less than the wall thickness of the pipe.

Monitoring for continuity of the base metal is carried out:

— for pipes of type 1 in the manufacture of pipes;

— for pipes type 2 in the manufacture of sheet steel, intended for the manufacture of pipes.

9.7.2.2 In the zones of the base metal of 40 mm wide pipes adjacent to the lines of fusion of longitudinal joints of pipes of type 2, stratification is not allowed, the size of which in any direction exceeds 6.4 mm.

The equipment is configured in accordance with Appendix B.

9.7.2.3 On the end sections of pipes with a diameter of 530 mm and more than a width of 40 mm, stratification is not allowed, the size of which in any direction exceeds 6.4 mm.

The equipment is configured in accordance with Appendix B.

9.7.2.4. Bevelled surfaces at the ends of pipes with a diameter of 530 mm or more shall undergo a magnetic particle inspection or a luminescent method.

Discontinuities, the indication from which exceeds the indication from artificial defects, is not allowed.

The sensitivity of the equipment is adjusted using a sample with artificial defects of length (3.2 ± 0.1) mm and an opening width (0.05 ± 0.01) mm, oriented in the annular and radial directions.

As agreed with the customer, the control of the bevelled surfaces of the ends of pipes of type 1 is not carried out.

9.7.2.5 Welded joints of pipes of type 1 after hydrotesting shall be subjected to ultrasonic testing or electromagnetic monitoring. Electromagnetic monitoring is allowed for pipes with a diameter of up to 426 mm inclusive.

9.7.2.6 Welded joints of pipes of type 2 shall be subjected to non-destructive testing by the following methods:

a) during technological inspection of welded joints of pipes (after welding):

— 100% of welded joints with decoding of welded joints, marked by АУК, РГК or РТК and РУЗК;

— 100% of RUZK at the ends of pipes at a length of up to 100 mm, which are not controlled by AUZ;

— RGC or RTK and RUZK welded welded sections;

b) during final control (after hydrotesting of pipes):

— 100% of welded joints with decoding of welded joints, marked by АУК, РГК or РТК and РУЗК;

— 100% RGC or RTC of the end sections of welded joints at a length of at least 200 mm.

Welded joints of pipes intended for the construction of underwater crossings shall be subjected to 100% RGC or RTK for technological or final inspection.

9.7.2.7 The rejection of welded joints following the results of non-destructive testing shall be carried out in accordance with annexes Gd.

9.7.3 Defects of welded joints of pipes

9.7.3.1 Welded joints shall be free of fissures, cracks, burns, fistulas, pores, rips, and sharp constrictions.

The initial sections and end craters of welded joints in type 2 pipes must be completely removed.

9.7.3.2 The depth of single cuts in one section of welded pipes of type 2 shall not be more than 0.4 mm for pipes of quality levels I and II and not more than 0.2 mm for pipes of quality level III and for pipes intended for underwater crossings. The length of undercuts is no more than 150 mm.

Do not unrepeated undercuts in one section of the pipe from the outer and inner surfaces of the joints.

9.8 Limiting magnetization of pipes

The residual magnetic induction at the ends of the pipes should not be more than 3 mT.