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

Supports for pipelines in polyurethane foam insulation

Pipe supports are used to hold elements of main networks. They are laid during the installation of pipe lines. Made from various steels strength characteristics and corrosion resistance.

Pipeline support prices add up

Wells
Cast iron hatches
Stairs for wells
Accessories for wells
Support plates for wells
Storm water inlets
Cast iron housings and manhole covers
Gas carpets and components
Locking devices for hatches
Other products
Hatches made of ductile iron and components
Cast iron cable consoles
Wells are structures that are designed for purification, control, inspection external sewerage and drainage systems. Main function such special structures is the collection and accumulation Wastewater, rain, etc. The bottom of such wells is equipped with various trays and grooves for directing wastewater. These wells ensure unhindered migration of water into them. Role sewer wells when performing repair and maintenance work, such as flushing and cleaning the entire system, it is very high. Depending on the functions performed, wells can be the following: storage, inspection, filtering, differential, rotary.

Insulation
Rockwool
Paroc
Xotpipe
K-flex
Energoflex
Izolin
Currently, there are a large number of pipes that connect to residential, industrial, and administrative buildings; they supply heat, water, gas, and there are also main gas pipelines carrying petroleum products. All of them require reliable protection - thermal insulation, waterproofing, protection from harmful influences environment etc. Why is this necessary? In order to extend the service life and quality of service of various pipelines, without which a full life is impossible these days. This section presents the insulation that serves reliable protection for pipelines and manufactured in modern production.

Cranes
Danfoss
Broen Ballomax
Taps serve as a device for regulating the flow of various working media in a pipeline system; at any time they can be opened or closed or the pressure of the supplied liquid can be adjusted, which is very convenient. This design is quite easy to use and ensures a long service life, because The likelihood of failure is very small and minimal. Cranes come in different designs and types. Used in various systems. Due to its simplicity of design, reliability in operation and durability, it locking device is very popular and is used in many industrial sectors- water supply, heating, gas supply systems, etc.

Pumps
Grundfos
Pumps are a device that moves gases or liquids. In the present modern conditions life without pumping equipment It is simply impossible to imagine, this is confirmed by the fact that 20% of the world's electricity is used to operate pumping equipment. Pumps are divided into household and industrial, depending on the scope of application. Domestic pumps are used in heating, sewage and water supply systems, and industrial pumps are used in cooling systems, water supply to industrial installations, water treatment, supply and pumping of liquids supplied under high pressure.

Zilmet
Reflex
This section presents expansion membrane tanks that serve as a reservoir for pumps and accumulators. When you choose a tank for heating system, it is necessary to pay attention to the membrane material, which must be durable and not be destroyed when exposed to aggressive environments and high temperature. Should be paid Special attention on working conditions and main purpose expansion tank in system. The certified products presented in this section are produced by the most successful companies that specialize in the production of these products.

Fitting
Locknuts
Couplings
Bends
Transitions
Threads
Sgony
Flanges
Stubs
Tees
Bochata
Welded parts of pipelines
Fittings for steel and cast iron pipes began to be used for threaded connections highways and devices from the moment of use metal pipe to move the working environment, therefore in our time it is even more difficult to overestimate the importance of these connecting elements. Pipes and fittings have always been the basis of any pipeline, therefore, with the development technical progress Technologies and types of steel and cast iron fittings developed. The price of making a fitting depends on the materials used, their weight and purpose. A cast iron fitting is made by casting and installed for branches, turns, and transitions of pipes to another diameter, especially in cases where periodic disassembly of connections is necessary. Steel fitting in to a greater extent acts as a welded threaded connector, as well as couplings and locknuts on bends, and is produced mainly from a pipe blank on lathes. Most of hydraulic devices such as heating devices, filters, distributors, automatic and control devices, etc. it is impossible to manufacture and connect to the pipeline without using steel and cast iron fittings.

Cast iron pipes (Svobodny Sokol)
Cast iron fittings
Our product catalog includes cast iron styles and ductile iron pipes - socket and floor type, which are made of high-strength cast iron with nodular graphite with a nominal diameter of 80, 100, 125, 150, 200, 250, 300, 350, 400, 500, 600, 700, 800, 900, 1000 mm. Ductile iron pipes are manufactured 6 meters long, with a sealing rubber ring, with external and internal coating that complies with the standards of GOST R ISO 2531, EN 545. Socket pipes with such types of connections as: TYTON, TYTON sewerage and RVS(RJ). Tyton (Tyton) - socket connection for an O-ring with a working pressure 3.0-6.4 MPa; RVS(RJ) - socket-lock joint under a rubber sealing ring with a working pressure of 2.5-8.8 MPa; High-strength cast iron with nodular graphite - ductile iron differs from gray cast iron with a lamellar shape graphite such as more high strength, which is close to the properties of low-carbon steel, and has higher resistance to cracking. To obtain such properties, ductile iron was obtained by modifying liquid cast iron with magnesium and various additives. As a result, a metal was obtained in which graphite is in the form of balls, which makes it possible to increase the ductility and strength of pipes and fittings.

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.

Designation:	GOST 3262-75*
Russian name:	Steel water and gas pipes. Specifications
Status:	active
Replaces:	GOST 3262-62
Date of text update:	01.10.2008
Date added to the database:	01.02.2009
Effective date:	01.01.1977
Designed by:	Ministry of Ferrous Metallurgy of the USSR
Approved:	USSR State Committee for Standards (09/11/1975)
Published:	Publishing house of standards No. 1994

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 in the batch unmeasured pipes up to 5% of pipes with a length of 1.5 to 4 m are allowed.

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 weight 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 to the positive side in terms of wall thickness is limited by the maximum deviations in the weight 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 the request of the consumer, the maximum mass deviations 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 of length should not exceed:

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

1.5 mm - with a nominal bore of more than 20 mm.

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

Table4

Conditional bore, mm	Thread length before run-out, mm		Conditional bore, mm	Number of threads at nominal size	Thread length before run-out, mm
Conditional bore, mm		short	Conditional bore, mm	Number of threads at nominal size		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 20´ 2.8 GOST 3262-75

The same with the coupling:

Pipe M-20´ 2.8 GOST 3262-75

The same, measured length, thread:

Pipe R-20´ 2.8 - 4000 GOST 3262-75

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

Pipe Ts-R-20´ 2.8 GOST 3262-75

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

Pipe Ts-R-20´ 2.8 - 4000 GOST 3262-75

For pipes with rolling threads 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 the prescribed manner, from steels in accordance with GOST 380 and GOST 1050 without standardization of mechanical properties and chemical composition.

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

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 GOST8944, GOST8954, GOST8965 and GOST8966 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.

Delaminations are not allowed at the ends of the pipes.

Individual dents, ripples, 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 zone.

(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, 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 (hartzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux stains 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 consumer's request, 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 consumer's request, 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 consumer's request, 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 customer's request mechanical properties pipes for parts of water supply and gas 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. Blackness on the threads is allowed in the place of shwad 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. For threads, it is allowed to reduce the useful length of the thread (without run-out) by 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 of 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 inspection 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 and gas structures, made of steel according to GOST1050: 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 batch of pipes 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.

Inspection of the outer diameter of pipes is carried out 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 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 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).

4.4v. Weld inspection is carried out using non-destructive methods according to regulatory and technical 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 in accordance with GOST 9.301 and GOST 9.302, as well as with instruments of the MT-41NTs, MTZON or “Impulse” type according to the regulatory and technical documentation.

4.6. The thread is checked using thread ring gauges in accordance with GOST 2533 (third accuracy class).

In this case, the screwability of the non-go-through 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 in accordance with GOST 8026 and a set of feelers according to ND.

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

4.8. The right angle of the pipe ends is controlled with a 90 square ° size 160´ 100 mm class 3 GOST 3749, plate probes set 4 according to ND or inclinometer GOST 5378. The bevel angle is controlled with a protractor according to GOST 5378.

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

4.9. The outer diameter is checked using smooth micrometers in accordance with GOST 6507, clamp gauges in accordance with GOST 2216 or GOST 18360.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358 from both ends of the pipe.

The length of the pipes is measured with a tape measure according to GOST 7502. The threads are controlled with gauges according to 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 in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion by lubricant in accordance with regulatory and technical documentation.

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

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. nook, A. I. Postolova

2. APPROVED AND PUSHED INTO EFFECT by the Resolution State Committee USSR according to standards from 09.11.75 No. 2379

3. Inspection frequency 5 years

4. INSTEAD GOST3262-62

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

	Item number
GOST 9.301-86
GOST 9.302-88
GOST 9.307-89
GOST 380- 94
GOST 1050-88
GOST 2216-84
GOST 2533-88
GOST 3728-78
GOST 3749-77
GOST 3845-75
GOST 5378-88
GOST 6357-81
GOST 6507-90
GOST 7502-89
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 -9 3

6. Validity restrictions were removed by Gosstandart Decree dated November 12, 1991 No. 1726

7. Reissue 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)

STEEL WATER AND GAS PIPES
GOST 3262-75

Specifications

Water-supply and gas-supply Specifications

Date of introduction: 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.

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

a) 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;

b) 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

Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter	lungs	ordinary	reinforced	lungs	ordinary	reinforced
6	10,2	1,8	2,0	2,5	0,37	0,40	0,47
8	13,5	2,0	2,2	2,8	0,57	0,61	0,74
10	17,0	2,0	2,2	2,8	0,74	0,80	0,98
15	21,3	2,35	-	-	1,10	-	-
15	21,3	2,5	2,8	3,2	1,16	1,28	1,43
20	26,8	2,35	-	-	1,42	-	-
20	26,8	2,5	2,8	3,2	1,5	1,66	1,86
25	33,5	2,8	3,2	4,0	2,12	2,39	2,91
32	42,3	2,8	3,2	4,0	2,73	3,09	3,78
40	48,0	3,0	3,5	4,0	3,33	3,84	4,34
50	60,0	3,0	3,5	4,5	4,22	4,88	6,16
65	75,5	3,2	4,0	4,5	5,71	7,05	7,88
80	88,5	3,5	4,0	4,5	7,34	8,34	9,32
90	101,3	3,5	4,0	4,5	8,44	9,60	10,74
100	114,0	4,0	4,5	5,0	10,85	12,15	13,44
125	140,0	4,0	4,5	5,5	13,42	15,04	18,24
150	165,0	4,0	4,5	5,5	15,88	17,81	21,63

table 2

Notes:

1. For threads made by rolling on a pipe, it is allowed to reduce it internal diameter 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.

(Changed edition, Amendment No. 1, 3)

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

Table 3

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.

Table 4

Conditional bore, mm	Number of threads at nominal size	Thread length before run-out, mm
Conditional bore, mm	Number of threads at nominal size	long	short
6	-	-	-
8	-	-	-
10	-	-	-
15	14	14	9,0
20	14	16	10,5
25	11	18	11,0
32	11	20	13,0
40	11	22	15,0
50	11	24	17,0
65	11	27	19,5
80	11	30	22,0
90	11	33	26,0
100	11	36	30,0
125	11	38	33,0
150	11	42	36,0

1.7. Pipes with a nominal bore 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 20×2.8 GOST 3262-75

The same with the coupling:

Pipe M-20×2.8 GOST 3262-75

The same, measured length, with thread:

Pipe R-20×2.8 - 4000 GOST 3262-75

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

Pipe Ts-R-20×2.8 GOST 3262-75

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

Pipe Ts-R-20×2.8 - 4000 GOST 3262-75

For pipes for rolling threads, the letter N is indicated in the symbol after the word “pipe”.

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 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 from steel according to.

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 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 according to.

(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)

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

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.

(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.

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%.

(Changed edition, Amendment No. 2, 3, 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 indicated in the table. 4, and at the consumer’s request up to 10%.

(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 document on quality in accordance with the addition for pipes intended for the manufacture of parts for water supply and gas pipeline structures, made of steel according to: chemical composition and mechanical properties of steel in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.

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 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).

3.3. To control thread parameters, to test for expansion, flattening, bending, internal burr height, burr residues, right angle and 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 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. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.

4.2. The surface of the pipes is inspected 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. 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°.

It is permissible 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.

(Changed edition, Amendment No. 3).

4.4v. Weld inspection is carried out using non-destructive methods according to regulatory and technical 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 devices of the MT-41NTs, MTZON or Impulse type according to the normative and technical 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 feelers according to TU 2-034-225-87.

(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, plate probes set 4 TU 2-034-225-87 or a protractor. The bevel angle of the chamfer is controlled using a protractor.

(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 .

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 using a tape measure. The thread is controlled by gauges.

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.

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).

(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 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

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 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).

(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).

Water and gas pipe for a long time will be made of steel. Alternative options– metal-plastic water conduits, ceramic, can be used only in certain areas: local water supply systems, free-flow sewerage, communications inside the building. However, when above ground installation the pipeline is exposed to too much stress weather factors. This eliminates the use of plastic or other products.

Characteristics of VGP

Water and gas pipes are made from steel blanks - strips, using the molding method. The edges of the workpiece are welded. The seam used is reinforced. Examination of the seam is the first task of quality control, since it represents a place increased risk. According to GOST 3262-75, radiography is used to determine quality.

Water and gas pipes, as a rule, are made straight-seam, since for these products the more important quality is resistance to internal pressure rather than resistance to external loads. On the picture - gas pipeline.

Advantages:

high strength, which allows the product to be used with any installation method and in any area;
oxygen and gas impermeability are precisely those properties due to which gas pipelines are and will be constructed only from steel products;
low coefficient of expansion - temperature and moisture changes do not affect the material. The pipeline does not expand, which allows the use of rigid fastening and does not require the installation of compensation devices;
durability - with proper maintenance it is 50 years;
affordable price.

Flaws:

quite heavy, which makes installation difficult and requires large quantity fasteners;
the need for preventive maintenance - metal accumulates electricity;
the need for thermal insulation when laying in the ground - the freezing liquid expands, while the parameters of the water pipeline remain unchanged. This leads to damage and ruptures.

VGP parameters

Dimensions and possible deviations regulated by GOST 3262-75.

Outer diameter – from 33 to 165 mm.
Wall thickness – from 1 to 5.5 mm.
Length – unmeasured ranges from 4 to 12 m, measured 4–8 or 8–12 m.

Because we're talking about O water pipes, then instead of the internal diameter, an indicator such as nominal diameter is used. It is given in both inches and mm.

Product varieties

Different way pipeline laying and different conditions operation assume different specifications. The rental company produces several modifications.

Classification by material

Raw materials for production water and gas pipes carbon steel of various grades is used. At the same time, GOST 3262-75 regulates two types of products:

water pipelines made of steel of ordinary precision - only the mechanical qualities of the product are controlled. Chemical composition steel is not being investigated. The products are used for household communication systems;
pipeline made of high-precision steel - galvanized steel is used in manufacturing, mechanical properties are standardized by GOST 3262-75. The products are used in the construction of large highways, where high pressure resistance is important.

In fact, both types of water and gas pipes are made of steel, but pass different levels control. As a result you get:

black – without galvanizing, more often used when laying gas lines;
galvanized - finished products are galvanized - immersed in molten zinc. Forms on the inner and outer surfaces of the product. protective layer, protecting against corrosion. Large water mains are constructed from galvanized VGP.

Release form

Water and gas pipes GOST 3262-75 are produced:

with threads at the ends (knurling or cutting) - it is worth noting that the protective layer is damaged during welding, and therefore galvanized products are mounted only by the threaded method;
without thread - a welded connection is assumed.

Resistance to hydraulic pressure

The thickness of the walls of the water and gas pipeline determines the strength and resistance to a certain hydraulic pressure. The classification is: