GOST R 57430-2017

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  ГОСТ Р 57430-2017

GOST R 57430−2017 Pipes, connecting parts of high-strength cast iron with nodular graphite and their connections for commercial oil pipelines. Technical specifications

GOST R 57430−2017
Group B6

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

PIPES, CONNECTION PIECES OF HIGH-STRENGTH CYLINDER WITH BALLET GRAPHITE AND THEIR CONNECTIONS FOR INDUSTRIAL OIL PIPELINES

Technical specifications

Pipes, fitting from ductile iron with spherical graphite and their connections for trade oil pipelines. Specifications

GCS 77.140.75
OKP 14 6000

Date of implementation 2017−09−01

Foreword

1 DEVELOPED by the Open Joint-Stock Company Russian Research Institute of the Pipe Industry (OJSC RosNITI)

2 was introduced by the Technical Committee for Standardization of TC 357 «Steel and Cast Iron Tubes and Cylinders»

3 APPROVED AND ENTRY INTO FORCE The Order of the Federal Agency for Technical Regulation and Metrology of March 28, 2017 N 200-st

4 INTRODUCED FOR THE FIRST TIME
The rules for the application of this standard are established in Article 26 of the Federal Law of June 29, 2015 N 162-FZ «On Standardization in the Russian Federation» . 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, the relevant notice will be published in the next issue of the monthly information index «National Standards». The relevant information, notification and texts are also posted in the public information system — on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet (www.gost.ru)

1 area of use

This standard specifies the requirements for pipes and fittings of high-strength spheroidal graphite cast iron and their compounds used for underground and aboveground laying for the construction of pipelines for in-field collection, transportation of oil and its associated components — impurities, gas and formation water.

2 Normative references

Normative references to the following standards are used in this standard:
GOST 9.602 Unified system of protection against corrosion and aging. Underground structures. General requirements for corrosion protection
GOST 166 Calipers. Technical specifications
GOST 577 Indicators of the watch type with a division price of 0.01 mm. Technical specifications
GOST 969 Cements are aluminous and high-alumina. Technical specifications
GOST 1497 Metals. Methods of tensile testing
GOST 2216 Caliber staples smooth adjustable. Technical specifications
GOST 3443 Castings of cast iron with various forms of graphite. Methods for determining the structure
GOST 6507 Micrometers. Technical specifications
GOST 7293 Cast iron with nodular graphite for castings
GOST 7565 Cast iron, steel and alloys. Method of sampling for chemical composition determination
GOST 8026 Testing rulers. Technical specifications
GOST 8736 Sand for construction works. Technical specifications
GOST 9012 Metals. Method for measuring Brinell hardness
GOST 9454 Metals. Methods of testing for impact bending at low, at room and elevated temperatures
GOST 10692 Steel pipes, cast iron and connecting parts to them. Acceptance, marking, packaging, transportation and storage
GOST 12821 Steel welded butt welds on P from 0.1 to 20.0 MPa (from 1 to 200 kgf / cm ). Design and dimensions
GOST 13841 Boxes of corrugated cardboard for chemical products. Technical specifications
GOST 14192 Marking of goods
GOST 15140 Materials for paint and varnish. Methods for determining adhesion
GOST 18360 Calibers-staples sheet for diameters from 3 to 260 mm. Dimensions
GOST 18365 Calibers-staples sheet with replaceable jaws for diameters from above 100 to 360 mm. Dimensions
GOST 19200 castings of cast iron and steel. Terms and definitions of defects
GOST 27208 Castings from cast iron. Methods of mechanical testing
GOST ISO 2531 Pipes, fittings, fittings and their compounds from spheroidal graphite iron for water and gas supply. Technical specifications

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 canceled without replacement, then the provision in which it is referenced is recommended to be adopted in the part not affecting this reference.

3 Terms, definitions, notations and abbreviations

3.1 Terms and definitions

In this standard terms are used in accordance with GOST 19200, as well as the following terms with the corresponding definitions:

3.1.1 high-strength cast iron with nodular graphite; Ductile Iron: The type of cast iron in which graphite is predominantly in a spherical form.

3.1.2 smooth end: The end of the pipe or connecting part is placed in the socket connection.

3.1.3 Length: The actual length of the pipe or connecting part (see Figure 1).

NOTE — For flanged connections, the actual length is the full length. For bell joints, the actual length is equal to the total length minus the depth at which the smooth end enters the bell.

3.1.4 permissible operating pressure: The internal pressure, excluding the pressure jumps, which the pipeline components must safely withstand during continuous operation.

3.1.5. The class of the pipe or connecting part; K: Coefficient of designating the wall thickness of the pipe or connecting part, selected from a number of numbers — 9, 10, 11, 12 …

3.1.6 nominal mass: reference mass of the casting with nominal dimensions.

3.1.7. Nominal pressure; PN, MPa: Digital pressure designation, expressed by a number that is indicative for all pipeline components of the same nominal size, having conjugate dimensions.

3.1.8 roundness; О ,%: Deviation from the circumference of the pipe cross-section, defined by formula

, (1)

where D  — the maximum external diameter, mm;

D  — The minimum external diameter, mm;

D is the nominal outer diameter, mm.

3.1.9 outgrowth: A branch from the main cylindrical part of the casting, located at an angle to it, with an equal or smaller nominal passage DN .

3.1.10 batch: The number of castings from which the test specimen is selected.

NOTE — For a batch, the number of pipes or connecting parts cast from a single melting metal, one size, one type of heat treatment is adopted.

3.1.11 bell: The end of the pipe or connecting part, covering the smooth end of the pipe or connecting part.

3.1.12 socket-and-socket connection: A fixed connection of pipes or connecting parts, in which a device is provided to prevent disconnection of the assembled connection while maintaining its tightness, mobility and strength.

Note — The socket-to-socket connection includes a sealing ring and a set of stoppers. These elements and the socket of the pipe can be of different design.

3.1.13 connecting part: A product attached to the pipe, which provides a deflection and / or a change in the direction of the pipeline.

3.1.14 pipe: Casting with an equal pass channel, with a straight axis, having a smooth and flared or flanged ends.

3.1.15 conditional passage; DN, mm: Rounded numerical designation of the internal flow section, which is common for all components of the pipeline system.

3.1.16 effective length; L, mm: For socket pipes and connecting parts L is equal to the total length minus the depth of the socket l , which includes a smooth end (see Figure 1).

3.2 Notations and abbreviations

3.2.1 Designations

b — width of the annular bead, mm;

D — outside diameter of the socket, mm;

D  — the maximum external diameter, mm;

D  — The minimum external diameter, mm;

DE — outer diameter of the pipe, mm;

DN — conditional pass, mm
h is the height of the annular bead, mm;
l — distance from the end of the pipe to the ring roller, mm;

l  — length of the bell, mm;

L — effective length, mm;

O — ovality,%;

PN — nominal pressure, MPa;

S — pipe wall thickness, mm;

S  — thickness of the inner coating, mm;
 — yield strength, N / mm ;
 — time resistance, N / mm ;
 — relative extension, %.

3.2.2 Abbreviations

Ductile Iron — high-strength cast iron with nodular graphite;
K — class of pipe or connecting part;
ДРК — double bell is compensating;
MC — clutch convolution;
MN — clutch thrust;
OP — branch outlet;
ORG — elbow, socket — smooth end;
PGG-nozzle, socket — smooth end;
ПФР — a branch pipe, a flange — a socket;
PFG — branch pipe, flange — smooth end;
PWG Art. — nozzle, bell — smooth end of steel;
ТР — tee socket;
TRG — tee, bell — smooth end;
TRFG — tee, flare — flange — smooth end;
TRF — tee, flare — flange;
UR — knee socket;
URG is the knee, the socket is the smooth end.

4 Assortment

4.1 Dimensions

4.1.1 Pipes and connecting parts are made by nominal passage DN 80, 100, 125, 150, 200, 250, 300, 350, 400 and 500 mm. The main dimensions of the smooth ends of the pipes are shown in Fig. 1 and in Table 1.

Figure 1 — Basic dimensions of pipes and their smooth ends

b is the width of the annular bead; D — outside diameter of the socket; DE — outer diameter of the pipe; h is the height of the annular bead; l — distance from the end of the pipe to the ring roller; l  — length of the socket; L is the effective length; S is the thickness of the pipe wall; S  — thickness of the inner coating

Figure 1 — Basic dimensions of pipes and their smooth ends

Table 1 — Basic dimensions and mass of pipes

Dimensions, mm								Nominal weight of pipe without cement coating / with cement coating, kg, with effective length L mm
Conditional- th passage DN	Outside the diameter of the rub D	Outside pipe diameter DE	Tol- Pipe wall thickness S	Internal thickness covered the S	Ras- standing- from the pipe end to the ring- roller l	The height of the ring- roller h	The width of the ring- roller b
5800	6000
80	156	98	6.0	3	85	5.0	8 ± 2.0	76.0 / 87.0	78.5 / 90.0
100	176	118	6.0	3	91	5.0	8 ± 2.0	95.0 / 108.0	98.0 / 12.0
125	205	144	6.0	3	95	5.0	8 ± 2.0	118.0 / 135.0	122.0 / 139.0
150	230	170	6.0	3	101	5.0	8 ± 2.0	143.0 / 163.0	148.0 / 168.0
200	288	222	6.3	3	106	5.5	9 ± 2.0	194.0 / 222.0	200.5 / 229.0
250	346	274	6.8	3	106	5.5	9 ± 2.0	255.0 / 290.0	264.0 / 299.0
300	402	326	7.2	3	106	5.5	9 ± 2.0	323.0 / 363.0	334.0 / 375.0
350	452	378	7.7	5	110	6.0	10 ± 2.0	401.0 / 473.0	415.0 / 488.0
400	513	429	8.1	5	115	6.0	10 ± 2.0	480.0 / 568.0	497.0 / 586.0
500	618	532	9.0	5	120	6.0	10 ± 2.0	666.0 / 776.0	689.0 / 800.0
Tolerances for DE and S are given for pipes without coatings. For other sizes, tolerances are not regulated. Nominal mass and wall thickness of the pipe are given for class K9. For other classes, these parameters may vary slightly. Notes 1 The thickness of the outer coatings is according to [1] * and [2] *. 2 Length of the funnel l do not regulate.

Pipes and connecting parts can have different types of socket-joint connections (for example «RJ», see Appendix A). The type of socket-and-socket connection is established by agreement between the manufacturer and the customer.

4.1.2. Die casting parts from Ductile iron are manufactured:
— with the socket part on one side and the smooth end on the other;
— with a flange on one side and a smooth end on the other;
— with flare parts from two or three (for tees) sides.
The names and designations of cast connecting parts are given in Table 2, the configuration and dimensions are in Appendix B.

Table 2 — Molded connecting parts

Name	Notation		Configuration and basic dimensions
in the schemes	in document
Tee socket		TP	Figure B.2, Table B.2
Knee socket		UR	Figure B.3, Table B.3
Knee, socket — smooth end		UWG	Figure B.4, Table B.4
Branch outlet		PR	Figure B.5, Table B.5
Branch, socket — smooth end		ORG	Figure B.6, Table B.6
The nozzle, the bell — the smooth end		PWG	Figure B.7, Table B.7
Pipe, flange — bell		FIUs	Figure B.8, Table B.8
Pipe, flange — smooth end		PFG	Figure B.9, Table B.9
Double bell of compensation		DRC	Figure B.10, Table B.10
Clutch		MS	Figure B.11, Table B.12
Coupling thrust		MN	Figure B.12, Table B.13

4.1.3 Welded connecting parts from Ductile Iron Iron are manufactured:
— with the socket part on one side and the smooth end on the other;
— with a flange on one side and a smooth end on the other;
— with bell parts with two or three (for tees) sides;
— with flare part, flange and smooth end (for tees).

NOTE — As agreed between the manufacturer and the customer, other options for the manufacture of welded connecting parts are possible.
The names and symbols of the welded connecting parts are given in Table 3, the configuration and dimensions are in Appendix B.
Table 3 — Welded connecting parts

Name	Notation		Configuration and basic dimensions
in the schemes	in document
Tee, socket — smooth end		TWG	Figure B.1, Table B.1
Tee, flare — flange — smooth end		TRFG	Figure B.1, Table B.1
Tee socket		TP	Figure B.2, Table B.2
Tee, flange — flange		TRF	Figure B.2, Table B.2
Knee, socket — smooth end		UWG	Figure B.3, Table B.3
Knee socket		UR	Figure B.4, Table B.3
Branch outlet		PR	Figures B.5, B.6, Tables B.4, B.5
Branch, socket — smooth end		ORG	Figures B.5, B.6, Tables B.4, B.5
Pipe, flange — smooth end		PFG	Figure B.7, Table B.6
Pipe, flange — bell		FIUs	Figure B.8, Table B.7
Socket, flare — smooth end of steel		PWG Art.	Figure B.9, Table B.8

4.2 Classes

Pipes and connecting parts make the following classes: K9, K10, K11, K12 …

4.3 Wall thickness

The nominal thickness of the wall of pipes and connecting parts S, mm, is calculated by the following formula, with the pipe wall thickness not less than 6 mm, connecting parts — not less than 7 mm:

, (2)

where K is the class of a pipe or a connecting part;

DN — conditional pass, mm.

4.4. Length

Pipes with socket connection deliver an effective length of 5800 and 6000 mm.

NOTE — When ordering pipes of a total length, the manufacturer can determine the number of pipes of any length required for delivery by summing the effective lengths of individual pipes.

4.5 Weight

The nominal weight of the pipes is given in Table 1.

4.6 Examples of symbols

Pipe of the socket (pipe Ductile) for the connection «RJ» (RJ), with the nominal passage DN 200 mm (200), measuring length 6000 mm (6000), class K10 (K10), manufactured according to GOST R:

The pipe of Ductile Iron — RJ — 200x6000 — K10 — GOST R 57430−2017

Tee tee (TP) with the barrel of the conditional pass DN 200 mm (200) and the process of the conditional pass DN 100 mm (100), with the socket connection «RJ» (RJ) made according to GOST R:

TR 200x100 — RJ — GOST R 57430−2017

Knee socket (UR) with nominal passage DN 300 mm (300), with socket connection «RJ» (RJ), manufactured according to GOST R:

UR 300 — RJ — GOST R 57430−2017

Knee, socket — smooth end (URG), with nominal passage DN 300 mm (300), with socket connection «RJ» (RJ), manufactured according to GOST R:

URG 300 — RJ — GOST R 57430−2017

Spigot socket (OP) with conditional pass DN 300 mm (300), with a central angle of 45 ° (45 °), with socket connection «RJ» (RJ), manufactured according to GOST R:

OP 300 — 45 ° — RJ — GOST R 57430−2017

Spigot, bell — smooth end (ORG) with conditional pass DN 400 mm (400), center angle 30 ° (30 °), with socket connection «RJ» (RJ), manufactured according to GOST R:

ORG 400 — 30 ° — RJ — GOST R 57430−2017

Socket, socket — smooth end (PGG) with nominal passage DN 250 mm (250), with socket connection «RJ» (RJ), manufactured according to GOST R:

PWG 250 — RJ — GOST R 57430−2017

Pipe, flange — socket (PFR) with nominal passage DN 500 mm (500), with socket connection «RJ» (RJ), manufactured according to GOST R:

PFR 500 — RJ — GOST R 57430−2017

Pipe, flange — smooth end (PPG) with nominal passage DN 80 mm (80), with socket connection «RJ» (RJ), manufactured according to GOST R:

PFG 80 — RJ — GOST R 57430−2017

Double compensating bell (DRC) with nominal passage DN 150 mm (150), manufactured according to GOST R:

DRC 150 — GOST R 57430−2017

Coupling (MC) with nominal passage DN 250 mm (250), manufactured in accordance with GOST R:

MS 250 — GOST R 57430−2017

Coupling thrust (MN) with nominal passage DN 200 mm (200), manufactured in accordance with GOST R:

MN 200 — GOST R 57430−2017

The welded tee, the socket is a smooth end (TRG), with the barrel of the conditional pass DN 200 mm (200) and the process of the conditional pass DN 100 mm (100), with the RJ socket (RJ) for a nominal pressure of 4.0 MPa (PN4, 0), manufactured according to GOST R:

TRG 200x100 — RJ — PN4.0 — GOST R 57430−2017

The welded branch pipe, flange — smooth end (PPG), with nominal passage DN 100 mm (100), with socket connection «RJ» (RJ), 555 mm long (L555) for a nominal pressure of 4.0 MPa (PN4.0), made in accordance with GOST R, flange version 1 (flange 1) in accordance with GOST 12821 of steel 20 (St20):

PFG 100 — RJ — L555 PN4,0 — GOST R 57430−2017 — Flange 1 — GOST 12821 - Ст20

The welded elbow, the socket is a smooth end (URG), with a nominal pass DN 200 mm (200), with a socket connection «RJ» (RJ) for a nominal pressure of 4.0 MPa (PN4.0), manufactured according to GOST R:

URG 200 — RJ — PN4,0 — GOST R 57430−2017

4.7 Information specified in the order

4.7.1 When ordering pipes and fittings from Ductile Iron, manufactured in accordance with this standard, the customer must specify the following mandatory requirements in the order:

a) the designation of this standard;

b) characteristics and classification of transported media (see 12.5, table 6);

c) conditional passage of pipes (see 4.1.1, table 1);

d) the name of the cast connector, if necessary (see 4.1.2, table 2);

e) the name of the welded connecting part, if necessary (see 4.1.3, table 3);

f) the class of the pipe or the connecting part (see 4.2);

g) length of pipes of dimensional length, or the total effective length of pipes in the order (see 4.4);

i) type of socket joint (see Appendix A);

j) conditional pass of the cast connector (see Appendix B);

l) conditional pass of the welded connecting part (see Appendix B).

4.7.2 If necessary, the customer can specify the following requirements in the order:

a) additional marking with paint on the outer surface of the pipe (see 5.12.6);

b) the supply of pipes with an outer protective coating (see 5.13.1);

c) the supply of pipes with an internal protective coating (see 5.13.1);

d) supply of pipes with external and internal protective coatings (see 5.13.1);

e) supply of connecting parts with an external protective coating (see 5.13.2);

f) supply of connecting parts with an internal protective coating (see 5.13.2);

g) supply of connecting parts with external and internal protective coatings (see 5.13.2);

i) increase the thickness of the inner coating of the epoxy composition or polyurethane material to 2 mm (see 5.13.4);

j) supply complete with polyethylene film (hose) (see 9.4);

l) increase in the length of the tee L up to 1.5 m (see Table B.1, Annex B);

m) angle change for tapping in the range from 5 ° to 45 ° (see Table B.4, Annex B);

n) changing the angle for retraction in the range from 45 ° to 88 ° (see Table B.5, Annex B);

n) changing the flange length — a smooth end up to 2 m (see Table B.6, Annex B);

p) changing the length of the flange-to-flare nozzle within a range of up to 2 m (see Table B.7, Annex B);

c) changing the length of the nozzle socket — smooth end of the steel within a range of up to 2 m (see Table B.8, appendix B).

4.7.3. If necessary, the following requirements can be agreed between the customer and the manufacturer:

a) the type of the socket joint (see 4.1.1);

b) other options for manufacturing welded connecting parts (see 4.1.3);

c) another type of packaging (see 5.12.7);

d) completeness of delivery (see 9.1).

5 Technical requirements

5.1 Method of production

5.1.1 Ductile iron pipes are manufactured with centrifugal castings.

5.1.2. Die casting parts from Ductile iron are manufactured by any foundry method.

5.1.3 Welded connecting parts are made by welding of blanks from Ductile Iron pipes using in some cases billets of carbon structural steel.

5.1.4. On the outer surface of the smooth ends of pipes and welded connecting parts, the annular rollers are fused by arc welding according to the dimensions indicated in figure 1 and in table 1. On cast connecting parts, annular rollers are made when casting connecting parts.

5.2 Chemical composition

The recommended chemical composition of cast iron for pipes and connecting parts is given in Appendix G.

5.3 Mechanical properties

5.3.1 The mechanical properties of pipes and fittings shall be in accordance with Table 4.

5.3.2. The temporary resistance of welded joints in welded joints shall be not less than 400 N / mm .


Table 4 — Mechanical properties of pipes and connecting parts

Product	Yield strength , N / mm	Temporary resistance , N / mm	Relating elongation ,%	Impact strength, J / cm
not less than
Pipes and welded connecting parts	300	420	10	3.0
Molded connecting parts and stopper	300	420	5

5.4 Hardness

5.4.1. The hardness of metal pipes and welded joints shall not exceed 230 NW.

5.4.2. The hardness of the metal of the cast connecting parts on the outer surface shall not exceed 250 Nm.

5.4.3. The hardness in the weld zone of the welded joints shall not exceed 230 Nm.

5.5 Microstructure

5.5.1 The microstructure of the pipe metal shall be ferritic with a spherical graphite shape. The proportion of the pearlitic component should not exceed 20%. The share of spherical graphite should be at least 95%. The amount of structurally-free cementite in the microstructure should not exceed 5%.

5.5.2 The microstructure of the metal of the connecting parts must be ferritic-pearlitic with a spherical shape of graphite. The proportion of the pearlitic component should not exceed 40%. The share of spherical graphite should be at least 95%. The amount of structurally-free cementite should not exceed 5%.

5.6 Limit deviations in size, length, shape and mass

5.6.1 Limit deviation of dimensions

5.6.1.1 The limiting deviations in the dimensions of the smooth ends of pipes and connecting parts are given in Table 1.

NOTE — For pipes with internal coating, a conditional passage DN of 10 mm can be reduced.

5.6.1.2 The maximum deviations in the wall thickness S and in the external diameter of the cylindrical part of the DE pipes shall not exceed the values indicated in Table 1. The plus tolerance for the wall thickness of the pipe is limited by the weight tolerance.

5.6.1.3 The maximum deviations in the wall thickness S of the cylindrical sections of the connecting parts shall not exceed the values specified in annexes B and B. The plus tolerance for the wall thickness of the connecting parts is limited by the tolerance for mass.

5.6.2 Limit length deviations

5.6.2.1 Limit variations in pipe lengths shall not exceed mm.

5.6.2.2 When supplying a batch of pipes of one dimensional length, the number of pipes with a minus tolerance shall not exceed 10%.

5.6.2.3 The maximum deviation of the length of the welded joints shall not exceed ± 2% of the length.

5.6.2.4 Limit deviations of the length of cast connecting parts with flares, with flange and flare, with flange and smooth end shall not exceed ± 20 mm, and along the length of flange connecting parts ± 10 mm.

5.6.3 Limit deviations of the form

5.6.3.1. The straightness of the whole pipe shall not deviate from more than 0.125% of the pipe length.

5.6.3.2 Ovality of smooth pipe ends and connecting parts shall:

— remain within the tolerances of the outer diameter — for DN from 80 to 200 mm inclusive;

— make up no more than 1% of the outer diameter — for DN from 250 to 500 mm inclusive.

5.6.4 Maximum mass deviations

The deviations of the actual mass from the nominal design mass should not exceed:

— ± 8% — for pipes and casting parts DN from 80 to 200 mm inclusive;

— ± 5% — for pipes and casting parts DN from 250 to 500 mm inclusive;

— ± 8% for welded connection parts.

Notes

1 The mass value above the maximum allowable value is not a defect condition provided that the set value of the nominal DN is ensured.

2 The mass value below the minimum permissible value is not a defect condition provided that the wall thickness of the pipe is within the specified tolerance.

5.7 Surface quality

5.7.1. On the outer and inner surfaces of pipes and connecting parts, defects caused by the production method are allowed, not removing the wall thickness for the minimum permissible values and not affecting the strength and tightness of the pipes during the hydrostatic test. Appendix D shows the allowable defects for pipes and fittings from Ductile iron, taking into account the terms of GOST 19200 .

5.7.2. At the point of contact of the sealing ring with the outer surface of the smooth end of the pipe and the connecting parts of the recesses, they must be embedded with fillers based on polyester resins. It is allowed to seal with putty on the basis of polyester resins of defective places located on other parts of the outer surface of the pipe and connecting parts, if they worsen the presentation.

5.7.3 At the point of contact of the rubber sealing ring with the inner surface of the socket, the recesses must be filled with fillers based on polyester resins.

5.8 Quality of welding seams

5.8.1 Welds of welded joints shall not be welded in:

— cracks of any size, of all kinds and directions, located in the weld metal and the weld zone;

— not welded at the root of a unilateral suture with a depth of more than 10% of the wall thickness or a total length of more than 30% of its length, regardless of depth;

— pores and slag inclusions according to requirements [3].

5.8.2. The surface of the welded joints of the welded joints shall be slightly convex. Undercuts, craters and burns are not allowed.

5.8.3 It is allowed to correct defects in the weld seam of a welded connecting part if the total length of a section with impermissible defects does not exceed 30% of its total length with a depth of these defects not exceeding 50% of the wall thickness and a crack length of not more than 50 mm.

5.8.4 Defective spots shall be removed, welded again and subjected to non-destructive testing. A one-sided seam with a non-welded root of the weld can be corrected by root welding.

5.9 Tightness

5.9.1. The pipes shall withstand the test hydrostatic pressure:

— not less than 6.0 MPa — for DN from 80 to 300 mm;

— not less than 4.0 MPa — for DN from 350 to 500 mm.

5.9.2. The welded joints shall withstand a test hydrostatic pressure equal to 1.25 of the working pressure.

5.10 Angle of folding

Angle of bending of welded joints in welded joints must be at least 18 °.

5.11 Finishing the ends

The end of the smooth end at the outer surface of the pipe should have a rounding radius of 5 mm.

5.12 Marking and packaging

5.12.1. On the inside surface of the pipe socket, a cast marking shall be marked, containing:

— name or trademark of the manufacturer;

— conditional pass;

— melting number;

— bucket number;

— pipe number;

— year and quarter of manufacture;

— material designation («GGG»).

5.12.2. On the outer surface of the connecting part, a marking shall be marked, containing:

— the manufacturer’s trademark;

— conventional designation of the connecting part;

— year of manufacture (two last digits are allowed);

— material designation («GGG»);

— nominal pressure for flange connections (PN).

5.12.3 Marking of welded joints is applied to the non-working surface by impact. The font height is 10−40 mm. It is allowed to paint with paint.

5.12.4 Marking on cast connectors is cast on a non-working surface. The designation of nominal pressure for flanges (PN) is allowed to be stamping. The font height is 10−40 mm.

5.12.5 For the marking of pipes and connecting parts with paint, the following information shall be affixed:

— reference to this standard;

— material designation («GGG95»);

— allowable working pressure.

5.12.6 Packing of pipes and connecting parts, as well as additional marking — according to GOST 10692. On the customer’s request it is allowed to apply additional paint marking on the outer surface of the pipe.

5.12.7 Sealing rubber rings are packed in cardboard boxes in accordance with GOST 13841 (not more than 30 kg), stoppers — in special containers (boxes). As agreed between the manufacturer and the customer, another type of packaging is allowed. Transport marking — according to GOST 14192 .

5.13 Protective Coatings

5.13.1 At the request of the customer, external or internal protective coatings or their various combinations are applied to the pipes.

5.13.1.1 Outer coatings:

a) metallic zinc — according to [1];

b) metallic zinc — according to [1] with zinc coating on the additional coating with one of the following materials:

— a primer based on acrylic resin — according to [4];

— epoxy composition — according to GOST 9.602, [5], [6];

— polyurethane — according to GOST 9.602, [5], [6];

— adhesive polymer tapes — according to GOST 9.602 ;

c) it is allowed to apply protective coatings on pipes without zinc coating.

5.13.1.2 Weight of zinc coating (not less than 130 g / m ) and the thickness of the final outer coating (at least 70 μm) — according to [1].

5.13.1.3 Internal coatings:

a) cement-sand from high-alumina cement — according to GOST 969, [7];

b) epoxy compositions or polyurethane materials — according to GOST 9.602, [5], [6].

5.13.2 At the request of the customer, an outer or inner protective coating or a combination thereof is applied to the connecting parts.

5.13.2.1 External coatings:

a) zinc-filled paint — according to [2];

b) Zinc-filled paint — according to [2], with an additional coating applied over it with one of the following materials:

— a primer based on acrylic resin — according to [4];

— epoxy composition — according to GOST 9.602, [5], [6];

— polyurethane — according to GOST 9.602, [5], [6];

— adhesive polymer tapes — according to GOST 9.602 ;

c) it is allowed to apply protective coatings on connecting parts without coating with zinc-filled paint.

5.13.2.2 Coating weight with zinc paint (not less than 150 g / m3 ) and the thickness of the final outer coating (at least 70 μm) — according to [2].

5.13.2.3 Internal coatings:

a) cement-sand from high-alumina cement — according to GOST 969, [7];

b) epoxy compositions or polyurethane materials — according to GOST 9.602, [5], [6].

5.13.3 Adhesion of applied outer coatings should not exceed 1 point.

5.13.4 The thickness of the internal cement-sand coating is [8]. The average thickness of the applied inner coating, consisting of an epoxy composition or a polyurethane material, should be at least 70 μm. At the request of the customer, it is possible to increase the thickness of the layer to 2 mm.

6 Safety and environmental requirements

6.1 Pipes and connecting parts are manufactured from explosion-proof, non-toxic and radiation-safe materials. Special safety precautions are not required for the entire life of the pipes and connecting parts.

6.2 When storing, transporting and operating, pipes and fittings are environmentally friendly products.

6.3 Pipes and connecting parts must be recycled at the end of the operation.

7 Acceptance rules

7.1 Pipes and connecting parts are accepted in batches. The number of castings inspected in the batch is determined by the manufacturer.

7.2 Pipes and fittings from Ductile iron are subjected to the following types of control:

— chemical composition;
— on stretching;
— impact strength;
— hardness;
— microstructure;
— measuring;
— visual;
— hydrostatic;
— the quality of the coating.

The welded joints additionally control the mechanical properties of the weld and the bending angle.

7.3 The control of the chemical composition of the cast iron of pipes and connecting parts shall be carried out on samples made of a liquid metal of one batch. The microstructure and chemical composition (other than sulfur and phosphorus content) of cast iron are optional characteristics and are not considered to be defective characteristics while observing the mechanical properties of the metal.

7.4 Control of the mechanical properties, hardness and microstructure of the metal pipes and connecting parts is carried out on samples made from any pipe, and on the connecting parts of the tidal samples in the tested lot.

7.5 A hydrostatic test, a visual and a measurement control, every pipe or connecting part must be subjected.

7.6. The results of hydrostatic testing of pipes and fittings are considered satisfactory if no visible leakage, sweat or other signs of damage are found on their outer surface.

7.7 When the unsatisfactory results of tests for temporary resistance, relative elongation or impact strength are obtained, repeated tests are carried out on this indicator of the doubled number of samples taken from the same pipe or connecting part. The results of repeated tests are distributed to the whole lot.

7.8 It is permissible in the case of unsatisfactory results of repeated tests to subject each product to piece-by-piece inspection for an ineffective index.

8 Methods of control and testing

8.1 Samples and samples for chemical analysis are selected in accordance with GOST 7565 .

The chemical composition of cast iron is determined by standard inspection methods.

When there are differences in the definition of the chemical composition, chemical analysis methods are used.

8.2. To conduct mechanical tests, determine the microstructure and hardness of the metal from the smooth end of the selected pipe, cut off the ring from which one tensile test specimen and three impact strength samples are made. Manufacture of samples — according to GOST ISO 2531. For connecting parts separately cast billets — according to GOST 7293 .

Tensile tests are carried out according to GOST 1497 or GOST 27208 .

8.3 Tests on the toughness of the metal pipes and connecting parts are carried out in accordance with GOST 9454 at a temperature of 20 ° C on samples without a notch. The result of the tests is formulated as the arithmetic mean value according to [9] .

8.4 Hardness testing is carried out in accordance with GOST 9012 .

8.5 Microstructure control is carried out in accordance with GOST 3443 .

8.6. The geometric dimensions of pipes, connecting parts and weld bead shall be controlled by a caliper -bracket in accordance with GOST 18360, GOST 18365, GOST 2216, a caliper according to GOST 166, a micrometer according to GOST 6507, or a template manufactured according to the manufacturer’s drawings.

8.7 The straightness of the entire pipe is checked visually. In case of disagreement, the deviation from the straightness of any section of the pipe with a length of 1 m can be measured using a calibration ruler in accordance with GOST 8026 and a set of probes or by other methods according to the manufacturer’s method.

8.8 The thickness of the wall of pipes and connecting parts is controlled by the ultrasonic inspection method in accordance with GOST ISO 2531 .

8.9 Determination of the mass of pipes and connecting parts is carried out on a scale by the manufacturer’s method.

8.10 Quality control of the external and internal surfaces of pipes and connecting parts is performed visually without the use of magnifying devices.

To determine the effect of such defects as gas roughness, shells, depressions, scratches on the strength and performance characteristics of pipes, it is necessary to determine the depth of the defect for the subsequent determination of the thickness of the defect-free metal under the defect.

The depth of defects is determined by the indicator of the watch type in accordance with GOST 577. The indicator should be adapted to measure depressions and shells with a diameter of 1.0 mm or more. It is allowed to use similar measuring devices with the same or higher accuracy class.

Measurements are made on the surface with the most characteristic defects, at any five points.

8.11 Hydrostatic testing of pipes and connecting parts is carried out in accordance with GOST ISO 2531 .

8.12 The pipe end rounding radius is controlled by the manufacturer’s documentation.

8.13 Composition and properties of cement-sand coating are regulated in accordance with GOST 969 and GOST 8736 or according to the documentation of the manufacturer.

8.13.1 Quality control of cement-sand coating applied to the pipe is performed visually and with the help of instrumental control methods according to [7].

8.13.2 The thickness of the internal cement-sand coating of the pipes is controlled by:

— immediately after its application — by piercing a special probe, manufactured according to the drawings of the manufacturer;
— after curing the cement-sand coating — thickness gage coatings.

8.13.3 The average value of the thickness of the internal cement-sand coating is measured in any section perpendicular to the axis of the pipe at four points, separated by 90 ° intervals, at a distance of at least 200 mm from the smooth end.

8.13.4 Quality control of the outer protective coating is performed visually. The thickness of the protective coating is measured by [10].

8.13.5 Adhesion of the outer finishing coating is determined by the method of lattice cuts in accordance with GOST 15140 at a distance of 200−500 mm from the edge of the pipe. The control is carried out not earlier than 24 hours after coating on pipes and connecting parts.

8.13.6 Control of the mass of the zinc coating is carried out according to [1].

8.14 Quality control of sealing rubber rings and stoppers is performed by [11] and [12].

9 Completeness

9.1 Completeness of delivery of pipes and connecting parts is determined by agreement between the manufacturer and the customer, taking into account the requirements of this section.

9.2 Pipes and connecting parts are supplied to the customer complete with sealing rubber rings. The dimensions and mass of the O-rings are determined by the type of the socket-and-socket joint. Technical requirements — according to [11].

9.3 Pipes and connecting parts are supplied to the customer complete with stoppers. Dimensions and weight of the stoppers are determined by the type of the socket-joint connection. Technical requirements — according to [12].

9.4 On request, the pipes can be supplied complete with polyethylene film (hose), designed to provide additional protection of pipelines against corrosion. The hose is put on pipes immediately before their laying.

9.5 For each batch of pipes to be delivered to the customer, the manufacturer must issue a document on the quality of the pipes, in which:

— designation of this standard;
— name of the manufacturer;
— name of the customer;
— conditional pass and class of pipes;
— number of pipes and total length in meters;
— batch number and melting number;
— rated design mass of pipes;
— type and number of sealing rubber rings;
— the value of the test hydrostatic pressure;
— temporary resistance, elongation, yield point;
— magnitude of impact strength;
— hardness of the metal pipes;
— chemical composition of cast iron;
— metallographic analysis;
— types of external and internal coating;
— the date of issue of the document.

9.6. For each consignment of connecting parts shipped to the customer, the manufacturer must issue a quality document in which:

— designation of this standard;
— name of the manufacturer;
— name of the customer;
— Order number;
— name and designation of connecting parts;
— number of connecting parts in pieces and lot weight;
— batch number and melting number;
— the value of the test hydrostatic pressure;
— type and number of sealing rubber rings;
— confirmation of conformity of products to the requirements of this standard;
— types of external and internal coating;
— date of issue of the quality document.

10 Transportation and storage

10.1 Transport and storage of pipes and connecting parts shall be carried out in accordance with GOST 10692 .

10.2 Pipes DN 80 to 300 mm are transported in packages. In the package, each layer of pipes is placed on special wooden pads. The number of pipes in packages is regulated by the manufacturer’s documentation. DN pipes from 350 to 500 mm are transported without packages.

The connecting parts are transported in special containers or in loose form. Transport marking — according to GOST 14192 .

10.3. Vehicles must be suitable for the transport, loading and unloading of pipes. During transportation, the following rules must be observed:

— do not allow direct contact of pipes with the bottom of the vehicle;
— during transportation, use side stops;
— fix the load with the help of textile belts and tensioning devices;
— when transporting pipes by road, the length of the hanging ends should not exceed 25% of the length of the pipe;
— do not allow the pipes to come in contact with the metal surfaces of the vehicle.

10.4 Storage of pipes in warehouses and construction sites is carried out in transport packages or without packages in specially equipped stacks.

The connecting parts can be stored in warehouses, in unheated rooms and under canopies.

10.4.1 Pipe bundles can be stacked, on uneven bars 80x80x2600 mm in size, 3 or 4 bags in each row. Each subsequent tier of packages is separated from the previous bars, the thickness of which is greater than the numerical value of the difference between the diameters of the bell and the cylinder of the pipe. The total height of the stack should not exceed 2.5 m.

10.4.2 Stacking of unpacked pipes must be carried out on even and strong bases. The rows of pipes in the stack should be laid on wooden pads. In this case, it is necessary to provide side supports preventing the spontaneous rolling of the pipes.

10.5 Stoppers are stored in open containers, sorted by diameters.

10.6 Sealing rubber rings are transported and stored in accordance with [11].

11 Loading and unloading

11.1 During loading and unloading operations with pipes and connecting parts, it is necessary to avoid swinging, blowing or friction of pipes and connecting parts about other pipes or connecting parts, ground, trailer supports, side of the car.

11.2 Loading and unloading of packages shall be carried out by devices ensuring the integrity and integrity of the packages. To move should be used devices using nylon ropes or belts with a four-fold margin for carrying capacity.

11.3 Do not drop, drop, or subject them to shock loads when transporting, loading and unloading connecting parts and tubing packs.

11.4 Loading and unloading of packages shall be carried out by capturing the entire package. It is forbidden to grip the bag for one pipe.

11.5 For unpainted pipes and connecting parts, hooks with an elastic coating should be used, and it is important to avoid contact of the metal with the inner coating to avoid damage to it.

12 Application notes

12.1 Pipes manufactured in accordance with this standard are designed for operation in pipelines with a transport temperature of up to 95 ° C.

NOTE — A short-term temperature increase of up to plus 130 ° C (up to 15 h once every 2 months) is possible.

12.2 Permissible operating pressure is given in Table 5.


Table 5 — Permissible operating pressure

Nominal passage DN, mm	Permissible operating pressure, MPa
80	4.0
100	4.0
125	4.0
150	4.0
200	4.0
250	3.6
300	3.4
350	3.0
400	2.5
500	2.5

12.3 Permissible temperature of operation and construction of pipelines — up to minus 40 ° C.

12.4 Pipes and fittings from Ductile Iron with an external protective coating can be used in all types of soils.

12.5 The characteristics of admissible media for the pipelines from Ductile iron are given in Table 6.

12.6 The customer specifies the characteristics and classification of the transported media in the order.

Table 6 — Characteristics of transport media

Wednesday	pH	Content of aggressive components						Degree of aggressive action
Miner- lization, g / dm	SVB	H S, mg / dm	CO , mg / dm	O , mg / dm	The particles, mg / dm
Fresh water (technical)
non-aerated	~ 7	less than 5	-	-	-	less than 0.5	-	Non-aggressive
aerated	~ 7	less than 5	-	-	-	more than 0.5	-	Slightly aggressive
Waters of underground horizons
non-aerated
— not containing H S, CO	6… 8	any	-	-	-	less than 0.1	100	Slightly aggressive