Electric-welded straight-seam GOST 3262 are electric-welded pipes that are used to create heating and water supply systems, as well as gas pipelines. The requirements specified in the regulations apply to steel products, which may or may not have threads and galvanized coating. thin-walled and thick-walled have a wide range of applications due to good technical specifications and low cost. With their help, it is possible to implement almost any project to supply a building with utility networks.

Types of VGP pipes

The presented type of rolled metal is produced with a length from 4 to 12 m. They can be divided into VGP pipes of measured and unmeasured length. Depending on the conditional passage, they can be wound into bays. Besides, hardware This type is divided into the following types:

standard precision pipes are produced without composition standardization mechanical properties;
high-precision pipes, the creation of which complies with GOST 1050-88 standards.

Products are divided into thick-walled and thin-walled steel pipes depending on the wall thickness. Experts often divide them into light, ordinary and enhanced on a similar basis. Buyers should carefully read the product characteristics, as this will affect the operation process in the future. Incorrect choice and installation may result in premature system failure and the need for immediate repairs.

Advantages of VGP pipes

It is important to buy water and gas pipes for housing and communal services, owners of private houses and enterprises. They have the following advantages:

high quality of workmanship and absence of defects;
the ability to select products with suitable diameter, size and weight;
ease of installation is ensured by the use of welding;
materials are resistant to corrosion, chemical and mechanical stress;
high strength and absence of deformation;
long service life;
ease of transportation and storage;
affordable price.

Anyone can acquire rolled metal of the presented type, wholesale or retail, choosing it in accordance with its purpose. The terms of delivery of goods are guaranteed to satisfy all buyers.

Water and gas pipes belong to the class of steel pipes for special purposes. Products are distinguished by manufacturing method. Dimensions and ratios are determined by GOST standards. Also, based on the needs of customers, pipes with or without threads are determined.

Welded steel products according to GOST 3262-75 are:

non-galvanized;
galvanized;
with thread (cut or knurled);
without thread.

Technical characteristics of steel gas supply pipes

Water and gas pipeline (WGP) products are used in the construction of industrial buildings, residential apartment buildings and private houses, administrative buildings, educational institutions and other objects.

VGP pipes are used:

cold water supply;
heating system;
gas pipeline

Steel welded products are cut to length within 4-12 m. Pipe footage according to GOST can be:

unmeasured (4-12 m) length;
measured (4-8 m or 8-12 m) length.

Water and gas pipes are conventionally divided into groups according to wall parameters:

lungs;
reinforced;
ordinary.

Light pipes

The ratio of sizes and weights of products are different and depend on the diameter, wall thickness, steel grade, and method of processing the material (galvanized, non-galvanized).

Table 1. Grid of parameters for light steel pipes

Conditional diameter dу (mm)	Side/wall thickness – S (mm)	Outside diameter– dH (mm)	Weight (1 m in kg)	Number of meters per ton Nt
6	1,8	10,2	0,37	2682
8	2,0	13,5	0,57	1763
10	2,0	17,0	0,74	1352
15	2,35	21,3	1,10	910,5
15	2,5	21,3	1,16	862,7
20	2,35	26,8	1,42	705,7
20	2,5	26,8	1,50	667,5
25	2,8	33,5	2,12	471,7
32	2,8	42,3	2,73	366,6
40	3,0	48,0	3,33	300,4
50	3,0	60,0	4,22	237,1
65	3,2	75,5	5,71	175,3
80	3,5	88,5	7,34	136,3
90	3,5	101,3	8,44	118,5
100	4,0	114,0	10,85	92,16
125	4,0	140,0	13,42	74,54
150	4,0	165,0	15,88	62,96

Ordinary pipes

Table 2. Metric data for ordinary VGP products

dу (mm)	S (mm)	dH (mm)	Weight (1 m in kg)	Nt
6	2,0	10,2	0,40	2473
8	2,2	13,5	0,61	1631
10	2,2	17,0	0,80	1245
15	-	21,3	-	-
15	2,8	21,3	1,28	782
20	-	26,8	-	-
20	2,8	26,8	1,66	603,4
25	3,2	33,5	2,39	418,2
32	3,2	42,3	3,09	324,1
40	3,5	48,0	3,84	260,4
50	3,5	60,0	4,88	205,1
65	4,0	75,5	7,05	141,8
80	4,0	88,5	8,34	120,0
90	4,0	101,3	9,60	104,2
100	4,5	114,0	12,15	82,29
125	4,5	140,0	15,04	66,50
150	4,5	165,0	17,81	56,14

Reinforced pipes

Reinforced pipes are distinguished by increased wall thickness and, accordingly, greater weight 1 linear meter. Such products are used for water supply and gas transportation under high pressure.

Table 3. Grid of parameters for reinforced steel products

6	2,5	10,2	0,47	2106
8	2,8	13,5	0,74	1353
10	2,8	17,0	0,98	1020
15	-	21,3	-	-
15	3,2	21,3	1,43	700,1
20	-	26,8	-	-
20	3,2	26,8	1,86	536,9
25	4,0	33,5	2,91	343,6
32	4,0	42,3	3,78	264,7
40	4,0	48,0	4,34	230,4
50	4,5	60,0	6,16	162,4
65	4,5	75,5	7,88	126,9
80	4,5	88,5	9,32	107,3
90	4,5	101,3	10,74	93,03
100	5,0	114,0	13,44	74,41
125	5,5	140,0	18,24	54,81
150	5,5	165,0	21,63	46,22

Threaded pipes

Factories produce steel pipes according to customer orders. Therefore, dimensions: length, diameter, wall thickness, design may be different. Pipes with cut threads are in great demand. Products are different at a high price, but on the other hand, adapted for easy installation no welding.

The thread is determined by the method of execution:

The knurling method is the most reliable way, in which compliance with standards is taken into account down to the last detail. Permissible deviations: diameter reduction from the inside by 10%.
External threading of a product.

The thread is provided both long and short. The following requirements apply to it (Table 5).

Table 5. Thread parameters for VGP pipes

dу (mm)	Size before run-off (mm)		Number of threads per pass
dу (mm)	short	long	Number of threads per pass
6	-	-	-
8	-	-	-
10	-	-	-
15	9,0	14	14
20	10,5	16	14
25	11,0	18	11
32	13,0	20	11
40	15,0	22	11
50	17,0	24	11
65	19,5	27	11
80	20,0	30	11
90	26,0	33	11
100	30,0	36	11
125	33,0	38	11
150	36,0	42	-

Note that the listed types of pipes (reinforced, light, ordinary) after galvanizing become 3% heavier than products made of ferrous metal. But the maximum mass deviation parameter should not exceed more than 8% (for a batch - 10%) according to GOST.

Technical requirements for steel water and gas pipes

Gas supply pipes are manufactured exclusively in accordance with the above standards. The materials used for the products are established by GOST 380 and 1050. This steel excludes mechanical and chemical impurities. Requirements for steel gas pipes are characterized according to the following principles: welded, threaded, galvanized, black.

Welded steel pipes

Requirements and tolerances according to GOST for welded steel pipes:

At seams – reduction to 0.5 mm in diameter. Only when making the product by furnace welding. And if in these places there is a shallow seal along the internal diameter - up to 1 mm.
The ends of products that require welding with a wall thickness of 5 mm or more are chamfered with an angle of 35-40 degrees towards the end. The end ring must correspond to a width (volume) of 1-3 mm.
Pipes with dy from 20 mm on the surface of the inner wall must have a flattened or cut burr. The height of this burr is not higher than 0.5 mm. With the same conditions, but with the parameters of a water and gas pipe with a passage of 15 mm and including production using the hot reduction method - a thickening of no more than 0.5 mm.

Threaded steel pipes

Tolerances and requirements for threaded steel products:

water thread gas pipes GOST 6357 (class B) is installed. There should be no burrs or torn areas.
Blackness on the seams is allowed only in the area with threads when following parameters: reduction in thread height from the basic norm - no more than 15%.
The thread length can be reduced up to 15% (without run-out), upon request - up to 10%.

Galvanized steel pipes

Requirements for galvanized steel pipes:

If gas and water pipes are made with a zinc coating, then the layer thickness should be 30 microns (not less). But the coating may be missing on the threads and ends of the product.
The galvanized surface should not have bubbles, detachments from the base material and various inclusions (oxides, charge, hartzinka).
The coating must be continuous.
Rare inaccuracies in the form of flux stains or capture marks on the surface are allowed.
Correction (re-application) of non-galvanized areas is allowed in accordance with GOST 9307. In general, no more than 0.5% of the entire surface.

Non-galvanized (black) steel products

Requirements for non-galvanized steel pipes:

Couplings are manufactured according to GOST standards: 8944, 8954, 8965 and 8966.
Cracks, sunsets, swelling or film on the surface of the product are excluded.
Minor defects are allowed: traces of stripping, layers of scale, dents, scratches, ripples. But only if they do not increase the volume of the wall beyond the minimum standard and do not interfere with viewing.
The ends of the VGP pipes are cut at right angles. The bevel size is no more than two degrees, and the burrs are no higher than 0.5 mm.

The durability of gas pipelines is checked according to the following indicators:

Hydraulic pressure withstand:
- for lung and ordinary VGP: 2.4 MPa (25 kgf/cm2);
- for reinforced VGP: 3.1 MPa (32 kgf/cm2);
- for special order products: 4.9 MPa (50 kgf/cm2).
Bend testing of gas and water supply products with different nominal bores (dy):
- dy up to 40 mm – surface diameter radius 2.5;
- dy up to 50 mm - surface diameter radius 3.5.
Distribution examination:
- dy 15 - 50 mm: not less than 7%;
- dy from 65 mm: not less than 4%.

Marking of steel water and gas pipes

Conventional marking of a steel pipe includes information about the size, quality of the material, processing and manufacturing method. At the end of the designation, the GOST number according to which the product is manufactured is added.

Principles of marking VGP pipes:

“20x2.8 GOST 3262-75” (hereinafter without specifying GOST and number). Explanation of the designation:
- non-galvanized ordinary pipe;
- wall thickness – 2.8 mm;
- length – unmeasured;
- dy – 20 mm (nominal diameter);
- without thread/coupling.
"M-20x2.8". Explanation of the designation:
- non-galvanized ordinary;
- wall thickness – 2.8 mm;
- no thread;
- length – unmeasured;
- dy – 20 mm;
- with coupling.
"R-20x2.8-5000". Explanation of the designation:
- non-galvanized ordinary;
- wall thickness – 2.8 mm;
- carving is present;
- length – measured (5 m);
- dy – 20 mm;
- without coupling.
"Ts-R-20x2.8". Explanation of the designation:
- galvanized ordinary;
- wall thickness – 2.8 mm;
- carving is present;
- length – unmeasured;
- dy – 20 mm;
- without coupling.
"Ts-R-20x2.8- 4000". Explanation of the designation:
- galvanized ordinary;
- wall thickness – 2.8 mm;
- carving is present;
- length – measured (4 m);
- dy – 20 mm;
- without coupling.

Note:

the letter “H” denotes knurled pipes with threads;
the letter “D” indicates products with long threads;
the letter “P” denotes VGP pipes with increased manufacturing precision.

Rules for storage, transportation, packaging of VGP steel pipes

Water and gas pipes do not have specific packaging requirements. Exceptions are products with d=6...20 mm. These gas and water supply products are packaged in coils at the customer’s request.

When transporting VGP pipes, it is necessary to adhere to the basic principle - the products are firmly fixed to prevent losses.
Yulia Petrichenko, expert

Gas and water pipes are stored based on the properties of the material:

If the products have a galvanized surface, then it is enough to fix them and cover them from moisture. Although these pipes are characterized by increased anti-corrosion properties, rust may appear in areas free of zinc coating due to high humidity;
Non-galvanized VGP products are stored in a dry place, excluding moisture penetration. Firmly fixed.

What pipes do you use for gas or water supply? How do you transport, pack or store pipes? Leave it in the comments Interesting Facts and useful information.

STEEL WATER AND GAS PIPES

TECHNICAL CONDITIONS

GOST 3262-75

PUBLISHING HOUSE OF STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

dateintroduction 01.01.77

This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.

(Changed edition, Rev. No. 1 , 3 ).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

of unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

Table 1

Dimensions, mm

Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter		ordinary	reinforced		ordinary	reinforced

table 2

Dimensions, mm

Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.

Table 3

Pipe sizes	Limit deviations for manufacturing precision pipes
		increased
Outer diameter with nominal bore:
up to 40 mm incl.
	- 0,5
Outer diameter with nominal bore: over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes:

1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.

2. Pipes of standard manufacturing precision are used for water supply, gas pipelines and heating systems. Pipes with increased manufacturing precision are used for parts of water and gas pipeline structures.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At customer's request maximum deviations by weight should not exceed:

7.5% - for the party;

10% - for a separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore over 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.

2.2. At the request of the consumer, the ends of pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring 1 - 3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the request of the consumer, pipes are equipped with couplings manufactured in accordance with GOST 8944, GOST 8954, GOST 8965 and GOST 8966 at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delamination is not allowed at the ends of the pipes.

Individual dents, rippling, scratches, traces of stripping and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along the inner diameter of no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, the burr on the inner surface of the pipe seam must be cut off or flattened, and the height of the burr or its traces should not exceed 0.5 mm.

At the request of the consumer, on pipes with a nominal bore of more than 15 mm, manufactured by furnace welding and hot reduction, a gentle thickening with a height of no more than 0.5 mm is allowed on the inner surface of the pipes in the weld area.

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

2.6. The ends of the pipes must be cut at right angles. The allowed end bevel value is no more than 2 ° . The remaining burrs should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas by 0.5% outer surface pipes according to GOST 9.307.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf/cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)

2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 outer diameters, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 outer diameters.

At the request of the consumer, pipes must withstand the distribution test:

for pipes with a nominal bore from 15 to 50 mm - no less than 7%;

for pipes with a nominal bore of 65 or more - no less than 4%.

At the request of the consumer, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8, 2.9. (Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050.

2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Amendment No. 3, 4).

2.12. At the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

Threads with torn (for cut) or incomplete (for rolled) threads are allowed on threads, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.

2.13. On a thread, it is allowed to reduce the useful length of the thread (without running) up to 15% compared to that specified in, and at the request of the consumer up to 10%.

2.12., 2.13. (Changed edition, Amendment No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Amendment No. 3).

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same brand and be accompanied by one quality document in accordance with GOST 10692 with the addition for pipes intended for the manufacture of parts for water supply and gas structures, made of steel according to GOST 1050: chemical composition and mechanical properties of steel in accordance with the document on the quality of the workpiece manufacturer.

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use statistical control methods in accordance with GOST 18242 c normal level. Control plans are established by agreement between the manufacturer and the consumer.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, the remains of burrs, the right angle and the chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch are selected, and for pipes manufactured by continuous furnace welding - two pipes per batch.

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

3.5. Each pipe is subjected to hydraulic pressure testing. With 100% quality control weld Using non-destructive methods, hydraulic pressure testing may not be carried out. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out according to GOST 10006. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.

(Changed edition, Amendment No. 3, 6).

4.2. The surface of the pipes is inspected visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure to test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .

It is allowed to test on a mandrel with a taper angle of 30 ° .

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Changed edition, Amendment No. 3).

STEEL WATER AND GAS PIPES

TECHNICAL CONDITIONS

GOST 3262-75

PUBLISHING HOUSE OF STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

dateintroduction 01.01.77

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.

(Changed edition, Rev. No. 1 , 3 ).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

of unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

Table 1

Dimensions, mm

Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter		ordinary	reinforced		ordinary	reinforced

table 2

Dimensions, mm

Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.

Table 3

Pipe sizes	Limit deviations for manufacturing precision pipes
		increased
Outer diameter with nominal bore:
up to 40 mm incl.
	- 0,5
Outer diameter with nominal bore: over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes:

1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At the request of the consumer, maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for a separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore over 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the request of the consumer, pipes are equipped with couplings manufactured in accordance with GOST 8944, GOST 8954, GOST 8965 and GOST 8966 at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delamination is not allowed at the ends of the pipes.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along the inner diameter of no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf/cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)

At the request of the consumer, pipes must withstand the distribution test:

for pipes with a nominal bore from 15 to 50 mm - no less than 7%;

for pipes with a nominal bore of 65 or more - no less than 4%.

At the request of the consumer, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8, 2.9. (Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050.

2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Amendment No. 3, 4).

2.12. At the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

2.13. On a thread, it is allowed to reduce the useful length of the thread (without running) up to 15% compared to that specified in, and at the request of the consumer up to 10%.

2.12., 2.13. (Changed edition, Amendment No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Amendment No. 3).

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use statistical control methods in accordance with GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

3.5. Each pipe is subjected to hydraulic pressure testing. With 100% quality control of the weld using non-destructive methods, hydraulic pressure testing may not be carried out. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out according to GOST 10006. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.

(Changed edition, Amendment No. 3, 6).

4.2. The surface of the pipes is inspected visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure to test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .

It is allowed to test on a mandrel with a taper angle of 30 ° .

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Changed edition, Amendment No. 3).

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GOST 3262-75 Steel water and gas pipes. Specifications

Categories GOST 3262-75 according to OKS:

23.40. Pipelines and their components
23.40.10 Cast iron and steel pipes *steel pipes and tubes for special purposes, see 77.140.75

Document status: valid, put into effect 01/01/1977 Name on English language: Water-supply and gas-supply steel pipes. Specifications Date of update of information according to the standard: 09/11/2019, at 10:56 (less than 3 months ago) Type of standard: Standards for products (services) Start date of GOST: 1977-01-01 Date of last publication of the document: 2007-05-01

Document codes GOST 3262-75:

OKP code: 138500;138501 KGS code: B62 OKSTU code: 1385

Number of pages: 8

Purpose of GOST 3262-75: This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures

SRSTI index(es): 534731 The document was developed by the organization: Ministry of Cherry and Metallurgical Metals of the USSR Document Keywords: tests, acceptance, assortment, technical requirements , non-galvanized pipes, galvanized pipes, welded pipes, steel pipes

Links to others: TU 2-034-225-88

You can download GOST 3262-75 in the following versions:

Date added to file version:

Amendments and changes to GOST 3262-75:

Name, type:

registration:

start of action:

Change No. 1 to GOST 3262-75

Change type: Text change
Change number: 1
Registration number: 2669

Change No. 2 to GOST 3262-75

Change type: Text change
Change number: 2
Registration number: 45

Change No. 3 to GOST 3262-75

Change type: Text change; Title changed
Change number: 3
Registration number: 4456
New value: See title

Change No. 4 to GOST 3262-75

Change type: Text change
Change number: 4
Registration number: 1139
New value: -

Change No. 5 to GOST 3262-75

Change type: Text change
Change number: 5
Registration number: 3347
New value: -

Change No. 6 to GOST 3262-75

Change type: Text change
Change number: 6
Registration number: 1726
New value: -

GOST 3262-75

Group B62

INTERSTATE STANDARD

STEEL WATER AND GAS PIPES

Specifications

Water-supply and gas-supply steel pipes. Specifications

OKP 13 8500, OKP 13 8501

Date of introduction 1977-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy

DEVELOPERS

V.I.Struzhok, Ph.D. tech. sciences; V.M.Vorona, Ph.D. tech. sciences; Yu.M. Mironov, Ph.D. tech. sciences; A.I. Postolova

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated 09.11.75 N 2379

3. Inspection frequency - 5 years

4. INSTEAD GOST 3262-62

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS


	Item number

________________
* In the territory Russian Federation operates .

6. The validity period was removed by Decree of the State Standard of November 12, 1991 N 1726

7. EDITION with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989, November 1991 ( IUS 1-78, 2-79, 4-87, 8-88, 2-90, 2-92)

(Changed edition, Amendment No. 2, 3, 5).

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in Table 1.

Table 1

Dimensions, mm


Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
		lungs	ordinary	reinforced	lungs	ordinary	reinforced

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table 2.

table 2

Dimensions, mm


Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm. Galvanized pipes are 3% heavier than non-galvanized pipes.

(Changed edition, Amendment No. 1, 3).

1.2. The length of the pipe is made from 4 to 12 m:

Measured or multiple measured length with an allowance for each cut of 5 mm and a longitudinal deviation for the entire length plus 10 mm;

Unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

1.3. Maximum deviations in pipe sizes should not exceed those indicated in Table 3.

Table 3


Pipe size	Limit deviation for precision pipes manufacturing
		increased
Outer diameter with nominal bore:
up to 40 mm incl.	0.4 mm -0,5
over 40 mm	0,8% -1,0
Wall thickness

Notes:

1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At the request of the consumer, maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore over 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those specified in Table 4.

Table 4


Conditional bore, mm	Number of threads at nominal size	Thread length before run-out, mm
			short

1.7. Pipes with a nominal diameter of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.

Examples of symbols

An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:

Pipe 20x2.8 GOST 3262-75

The same with the coupling:

Pipe M-20x2.8 GOST 3262-75

The same, measured length, with thread:

Pipe P-20x2.8-4000 GOST 3262-75

The same, with zinc coating, of unmeasured length, with thread:

Pipe Ts-R-20x2.8 GOST 3262-75

The same, with zinc coating, custom length, with thread:

Pipe Ts-R-20x2.8-4000 GOST 3262-75

For pipes for thread rolling in symbol After the word “pipe” the letter N is indicated.

For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.

For pipes with increased manufacturing precision, the letter P is indicated in the symbol after the size of the nominal bore.

(Changed edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in in the prescribed manner, from steels with and without standardization of mechanical properties and chemical composition.

Pipes for parts of water supply and gas pipeline structures are made of steel in accordance with GOST 1050.

2.2. At the consumer's request, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35-40° to the end of the pipe. In this case, an end ring 1-3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1, 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the consumer's request, pipes are equipped with couplings made according to , and , at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delamination is not allowed at the ends of the pipes.

Individual dents, rippling, scratches, traces of stripping and other defects caused by the production method are allowed if they do not exceed the wall thickness minimum dimensions, as well as a layer of scale that does not interfere with inspection.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along the inner diameter of no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

2.6. The ends of the pipes must be cut at right angles. The bevel of the end is allowed to be no more than 2°. The remaining burrs should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm) - ordinary and light pipes;

3.1 MPa (32 kgf/cm) - reinforced pipes.

At the request of the consumer, the pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf/cm).

At the request of the consumer, pipes must withstand the distribution test:

For pipes with a nominal bore from 15 to 50 mm - no less than 7%;

For pipes with a nominal bore of 65 mm or more - no less than 4%.

At the request of the consumer, pipes must withstand the flattening test to a distance between flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8, 2.9. (Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050.

2.11. Pipe threads must be clean, without flaws or burrs and correspond to accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10, 2.11. (Changed edition, Amendment No. 3, 4).

2.12. At the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

2.13. On a thread, it is allowed to reduce the useful length of the thread (without run-out) by up to 15% compared to that indicated in Table 4, and at the request of the consumer - up to 10%.

2.12, 2.13. (Changed edition, Amendment No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Amendment No. 3).

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same grade of steel and be accompanied by one quality document in accordance with the addendum for pipes intended for the manufacture of parts for water supply and gas structures, made of steel according to; chemical composition and mechanical properties of steel - in accordance with the document on the quality of the manufacturer of the workpiece.

Batch weight - no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use statistical control methods at a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out in accordance with GOST 10006. Instead of the tensile test, it is allowed to control the mechanical properties by non-destructive methods.

4.2. Inspection of the pipe surface is carried out visually.

4.3. Hydraulic testing is carried out with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out on a conical mandrel with a taper angle of 6°.

Testing on a mandrel with a taper angle of 30° is allowed.

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Changed edition, Amendment No. 3).

4.4v. Weld inspection is carried out using non-destructive methods in accordance with regulatory documentation.

(Introduced additionally, Amendment No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled by and, as well as by instruments of the MT-41NTs, MTZON or "Impulse" type according to regulatory documentation.

4.6. The threads are checked using threaded ring gauges (third accuracy class).

In this case, the screw-in of the no-go ring gauge onto the thread should be no more than three turns.

(Changed edition, Amendment No. 3, 4).

4.7. The curvature of the pipes is controlled using a straight edge and a set of probes according to ND.

(Changed edition, Amendment No. 3, 5).

4.8. The right angle of the pipe ends is controlled with a 90° square measuring 160x100 mm class 3 according to , plate probes set 4 according to ND or an inclinometer according to GOST 5378. The bevel angle of the chamfer is controlled with an inclinometer according to GOST 5378.

(Changed edition, Amendment No. 3, 6).

4.9. Control of the outer diameter is carried out with smooth micrometers according to, clamp gauges according to or GOST 18360.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer or a wall gauge at both ends of the pipe.

The length of the pipes is measured with a tape measure in accordance with GOST 7502. The threads are controlled with gauges in accordance with GOST 2533.

The mass of a batch of pipes is controlled on scales of no more than 10 tons with a division value of no more than 20 kg.

(Changed edition, Amendment No. 3, 4, 5, 6).

4.10. Weld inspection is carried out using non-destructive methods according to technical documentation.

(Introduced additionally, Amendment No. 4).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Labeling, packaging, transportation and storage are carried out according to the addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion with lubricant according to regulatory documentation.

Section 5. (Changed edition, Amendment No. 3).

The text of the document is verified according to:
official publication
Metal pipes and connecting parts to them.
Part 3. Welded pipes. Profile pipes: Sat. GOST. -
M.: IPK Standards Publishing House, 2001

Steel water and gas pipes. Water and gas pipes (WGP): types, characteristics, application Steel pipe DN15 GOST 3262 75

Types of VGP pipes

Advantages of VGP pipes

Technical characteristics of steel gas supply pipes

Light pipes

Ordinary pipes

Reinforced pipes

Threaded pipes

Technical requirements for steel water and gas pipes

Welded steel pipes

Threaded steel pipes

Galvanized steel pipes

Non-galvanized (black) steel products

Marking of steel water and gas pipes

Rules for storage, transportation, packaging of VGP steel pipes

1. ASSORTMENT

Dimensions, mm

3. ACCEPTANCE RULES

4. TEST METHODS

1. ASSORTMENT

Dimensions, mm

3. ACCEPTANCE RULES

4. TEST METHODS

Classifier OKPD 2

Legend

File types

GOST statuses

GOST 3262-75 Steel water and gas pipes. Specifications

You can download GOST 3262-75 in the following versions:

Amendments and changes to GOST 3262-75:

INTERSTATE STANDARD

INFORMATION DATA

1. ASSORTMENT

2. TECHNICAL REQUIREMENTS

3. ACCEPTANCE RULES

4. TEST METHODS

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE