GOST for water and gas pipes. Water and gas pipes (VGP): types, characteristics, application

Pipes of the VGP category are a group of water and gas pipes made of steel. Moreover, there are galvanized and non-galvanized options. Pipes are hollow, cylindrical in shape, having a longitudinal welded seam.

The category has three options for wall thickness - thick-walled, medium and thin-walled. An assortment of this nature makes it possible to use pipes suitable specifically for the project in which they are used.

Product parameters

The name speaks for itself - a pipe of this type can be used both in plumbing systems and in gas pipelines. In principle, the VGP pipe is considered a universal option for many applications.

Standard pipes have a length of segments from 4 m to 12 m. Moreover, there is a choice of material - without thread, or with cylindrical or knurled threads at the ends. Moreover, it can be short or long - it all depends on the nuances in use.

Typically, the VGP pipe has three strength categories:

Ordinary.
Lungs.
Reinforced.

Although such pipes are heavier than non-galvanized ones, by about 3%, the coating gives an excellent result when liquids pass through the line. The pipe does not rust, and its service life is extended significantly.

Advantages of VGP pipes

Standard pipes VGP GOST 3262 75 are made of high quality steel.

The so-called "black pipes" of the VGP have a reinforced welded seam.

Pipes of this type have three categories convenient for the consumer - light, reinforced and ordinary. This allows you to choose the right option for the perfect design of the highway.

The thread at the ends of the pipes can be long, short, or applied, depending on the wishes of the customer, to the desired side in the required parameters.

Pipes of this category are supplied either with or without couplings.

Pipe parameters can be indicated in inches, which is considered the norm.

The pipes being sold undergo mandatory hydro-vortex control, so compliance with the standards can be considered almost perfect.

Low cost with excellent product quality is the guarantor of the assigned standards and regulations.

Versatility in application. Pipes of the right type are ideal for installation and repair work of almost any category.

A huge range of pipe varieties - from hot-rolled seamless to cold-rolled and electric-welded options.

The presence of components - flanges, couplings, tees, bends, transitions and other things, as well as the possibility of their easy use in installation work.

As you understand, standard VGP pipes GOST 3262 75 have a wide range of applications. The presence of at least three types of this type makes it possible to use them in almost all areas of pipelines. Moreover, it is possible to select a category for the type of line, with a rich selection of pipe types for its installation.

GOST 7502-98

GOST 8026-92

GOST 8694-75

GOST 8695-75

GOST 8944-75

GOST 8954-75

GOST 8965-75

GOST 8966-75

GOST 10006-80

GOST 10692-80

GOST 11358-89

GOST 18242-72

GOST 18360-93

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

7. EDITION (May 2007) with Amendments Nos. 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)

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

(Changed edition, Rev. N 2, 3, 5).

1. ASSORTMENT

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

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

(Changed edition, Rev. N 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 off-gauge pipes.

Table 1

Dimensions, mm


Conditional pass	Outside diameter	Pipe Wall Thickness			Weight of 1 m of pipes, kg
		lungs	ordinary	enhanced		ordinary	enhanced

table 2

Dimensions, mm


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

Notes:

1. For a thread made by knurling, a reduction in its inner diameter of up to 10% along the entire length of the thread is allowed on the pipe.

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

1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table 3.

Table 3


Pipe size	Limit deviation for precision pipes
	ordinary	elevated
Outer diameter with nominal bore:
up to 40 mm incl.	0.4mm -0,5
over 40 mm
Wall thickness

Notes:

1. The maximum deviation in the plus side along the wall thickness is limited by the maximum deviations in the mass of pipes.

2. Pipes of ordinary manufacturing accuracy are used for water pipes, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water and gas pipeline structures.

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

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

+7.5% - for the party;

+10% - for a separate pipe.

(Changed edition, Rev. N 2, 5).

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

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

1.5 mm - with nominal bore over 20 mm.

1.6. Pipe threads can be long or short. Thread requirements must be as specified in Table 4.

Table 4


Conditional passage, mm	Number of threads with conditional passage	Thread length to the run, mm
		long	short

1.7. Pipes with a nominal bore of 6, 8, 10.15 and 20 mm are wound into coils at the request of the consumer.

Legend Examples

Ordinary pipe, non-galvanized, of the usual manufacturing accuracy, random length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without thread and without a coupling:

Pipe 20x2.8 GOST 3262-75

The same with the clutch:

Pipe M-20x2.8 GOST 3262-75

The same, measured length, threaded:

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

The same, zinc coated, random length, threaded:

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

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

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

For pipes for thread rolling, the letter H is indicated after the word "pipe" in the symbol.

For pipes with a long thread, the letter D is indicated after the word "pipe" in the symbol.

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

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations approved in the prescribed manner, from steels according to GOST 380 and GOST 1050 without standardization of mechanical properties and chemical composition.

Pipes for parts of water and gas pipeline structures are made of steel according to GOST 1050.

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

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

2.1, 2.2. (Changed edition, Rev. N 3, 4).

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

(Changed edition, Rev. N 3).

2.4. Cracks, captivity, swelling and sunsets are not allowed on the surface of the pipes.

At the ends of the pipes, delamination is not allowed.

Separate dents, ripples, risks, traces of stripping and other defects due to the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a scale layer 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 weld site if there is a gentle thickening of the inner diameter of not more than 1.0 mm in this place.

(Changed edition, Rev. N 3, 4).

2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, on the inner surface of the pipe seam, the burr must be cut or flattened, while 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, made by the method of furnace welding and the method of hot reduction, a gentle thickening of a height of not more than 0.5 mm is allowed on the inner surface of the pipes in the weld zone.

(Changed edition, Rev. N 2, 3, 4, 5, 6).

2.6. Pipe ends must be cut square. The value of the bevel of the end is allowed no more than 2 °. Burr residues 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, made by furnace welding.

(Changed edition, Rev. N 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, blistering and foreign inclusions (hardzinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.

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

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

(Changed edition, Rev. N 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).

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

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

for pipes with nominal bore from 15 to 50 mm - not less than 7%;

for pipes with a nominal bore of 65 mm or more - at least 4%.

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

2.8, 2.9. (Changed edition, Rev. N 2, 3, 5).

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

2.11. The pipe thread must be clean, without flaws and 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, Rev. N 3, 4).

2.12. In the place of the seam, blackness on the threads of the thread is allowed if the decrease 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 stripped (for cut) or incomplete (for knurled) 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. It is allowed on the thread to reduce the useful length of the thread (without run-off) 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, Rev. N 2, 3, 5).

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

2.15. (Deleted, Rev. N 3).

2.16. At the request of the consumer, welded seams of pipes are subjected to control by non-destructive methods.

(Changed edition, Rev. N 5).

3. ACCEPTANCE RULES

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

Party weight - no more than 60 tons.

(Changed edition, Rev. N 3, 4).

3.2. The surface, dimensions and curvature are checked for each pipe of the batch.

It is allowed to apply statistical control methods according to GOST 18242 * with a normal level. Control plans are established by agreement between the manufacturer and the consumer.
________________
* On the territory of the Russian Federation, GOST R 50779.71-99 applies.

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

(Changed edition, Rev. N 3, 4, 5).

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

(Changed edition, Rev. N 3, 4).

3.4. All pipes are subjected to weight control.

(Changed edition, Rev. N 3).

3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the weld by 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, Rev. N 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 are taken from the lot.

(Changed edition, Rev. N 2).

3.7. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample.

The retest results apply to the entire lot.

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 by non-destructive methods.

(Changed edition, Rev. N 3, 6).

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

4.3. Hydraulic testing is carried out in accordance with GOST 3845 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, Rev. N 3).

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

The test can be carried out on a mandrel with a taper angle of 30°.

(Changed edition, Rev. N 3, 4).

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

(Changed edition, Rev. N 3).

4.4c. Weld seam control is carried out by non-destructive methods according to normative documentation.

(Introduced additionally, Rev. N 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301 and GOST 9.302, as well as with devices of the MT-41NTs, MTZON or Impulse types according to regulatory documentation.

4.6. The thread is checked with threaded ring gauges according to GOST 5378 from both ends of the pipe.

The length of the pipes is measured with a tape measure according to GOST 7502. The thread is controlled by gauges according to GOST 2533.

The control of the mass of a batch of pipes is carried out on scales of not more than 10 tons with a division value of not more than 20 kg.

(Changed edition, Rev. N 3, 4, 5, 6).

4.10. Weld seam control is carried out by non-destructive methods according to technical documentation.

(Introduced additionally, Rev. N 4).

5. MARKING, PACKAGING, TRANSPORT AND STORAGE

5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion by grease in accordance with regulatory documents.

Section 5. (Changed edition, Rev. N 3).

Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
M.: Standartinform, 2007

GOST 7502-98

GOST 8026-92

GOST 8694-75

GOST 8695-75

GOST 8944-75

GOST 8954-75

GOST 8965-75

GOST 8966-75

GOST 10006-80

GOST 10692-80

GOST 11358-89

GOST 18242-72

GOST 18360-93

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

1. ASSORTMENT

Table 1

Dimensions, mm


Conditional pass	Outside diameter	Pipe Wall Thickness			Weight of 1 m of pipes, kg
		lungs	ordinary	enhanced		ordinary	enhanced

table 2

Dimensions, mm


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

Notes:

1. For a thread made by knurling, a reduction in its inner diameter of up to 10% along the entire length of the thread is allowed on the pipe.

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

1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table 3.

Table 3


Pipe size	Limit deviation for precision pipes
	ordinary	elevated
Outer diameter with nominal bore:
up to 40 mm incl.	0.4mm -0,5
over 40 mm
Wall thickness

Notes:

1. The maximum deviation in the plus side along the wall thickness is limited by the maximum deviations in the mass of pipes.

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

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

1.5 mm - with nominal bore over 20 mm.

1.6. Pipe threads can be long or short. Thread requirements must be as specified in Table 4.

Table 4


Conditional passage, mm	Number of threads with conditional passage	Thread length to the run, mm
		long	short

1.7. Pipes with a nominal bore of 6, 8, 10.15 and 20 mm are wound into coils at the request of the consumer.

Legend Examples

Ordinary pipe, non-galvanized, of the usual manufacturing accuracy, random length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without thread and without a coupling:

Pipe 20x2.8 GOST 3262-75

The same with the clutch:

Pipe M-20x2.8 GOST 3262-75

The same, measured length, threaded:

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

The same, zinc coated, random length, threaded:

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

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

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

2. TECHNICAL REQUIREMENTS

2.1, 2.2. (Changed edition, Rev. N 3, 4).

2.8, 2.9. (Changed edition, Rev. N 2, 3, 5).

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

2.11. The pipe thread must be clean, without flaws and 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, Rev. N 3, 4).

2.13. It is allowed on the thread to reduce the useful length of the thread (without run-off) 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, Rev. N 2, 3, 5).

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

2.15. (Deleted, Rev. N 3).

2.16. At the request of the consumer, welded seams of pipes are subjected to control by non-destructive methods.

(Changed edition, Rev. N 5).

3. ACCEPTANCE RULES

3.4. All pipes are subjected to weight control.

(Changed edition, Rev. N 3).

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

(Changed edition, Rev. N 2).

3.7. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample.

The retest results apply to the entire lot.

4. TEST METHODS

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

4.3. Hydraulic testing is carried out in accordance with GOST 3845 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, Rev. N 3).

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

(Changed edition, Rev. N 3).

4.4c. Weld seam control is carried out by non-destructive methods according to normative documentation.

(Introduced additionally, Rev. N 3).

4.10. Weld seam control is carried out by non-destructive methods according to technical documentation.

(Introduced additionally, Rev. N 4).

5. MARKING, PACKAGING, TRANSPORT AND STORAGE

5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion by grease in accordance with regulatory documents.

Section 5. (Changed edition, Rev. N 3).

Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
M.: Standartinform, 2007

The METALLSERVICE company supplies the entire range of steel water and gas pipes that meet the requirements of GOST 3262-75. Wholesale prices apply to all metal products.

The catalog contains galvanized and non-galvanized products DN 8–100 mm, with or without rolled or cut cylindrical threads. Rolled metal of this type is always available in warehouses in Moscow, St. Petersburg, Samara, Rostov-on-Don, Penza, Novosibirsk, Khabarovsk and other cities. Delivery is carried out throughout Russia and the Republic of Belarus. The speed of shipment depends on the ordered batch and averages 1-12 hours.

Classification of gas pipes according to GOST 3262-75

There are several length options available:

measured (4–12 m);
multiple measured (up to 12 m, allowance for each undercut - 5 mm, longitudinal deviation along the entire length - up to 10 mm);
unmeasured (by individual size, within 4–12 m).

Up to 5% of the total number of off-gauge VGP pipes manufactured in accordance with GOST 3262-75 can be made with a length of 1.5–4 m. For the entire length of the thread made by knurling, the inner diameter of the products can be reduced by 10%.

The mass of 1 m of the presented metal products is indicated taking into account the density of the steel alloy of 7.85 g per cubic meter. see. At the same time, VGP galvanized pipes weigh 3% more than non-galvanized ones.

Depending on the degree of compliance with regulatory geometric parameters, pipes are divided into 2 classes:

According to the wall thickness, the products are divided into light, ordinary and reinforced. On products of the last two types, having a nominal bore of more than 10 mm, threads can be applied at both ends. The choice includes products both without thread and without couplings, and with both.