Water and gas pipes (VGP): species, characteristics, application. Steel Pipes Water Supplies Seamless Water Supplies Pipes GOST 3262 75

Articles on the topic:

Water-gas pipes belong to the class of steel pipes of the target destination. Different products by manufacturing method. Dimensions and ratios are due to guest standards. Also, based on customers' needs, determine the pipes with thread or without it.

Welded steel products according to GOST 3262-75 are:

non-scattered;
galvanized;
with thread (sliced \u200b\u200bor rolled);
without thread.

Technical characteristics of steel gas produced pipes

Water-based (VGP) products are used in the construction of industrial structures, residential apartment buildings and private houses, administrative buildings, educational institutions and other objects.

VGP pipes apply:

cold water supply;
heating system;
gas pipeline.

Steel welded products are cut in length in the range of 4-12 m. Method of pipes according to GOST may be:

non-measure (4-12 m) length;
dimensional (4-8 m or 8-12 m) length.

Water-gas pipes are conditionally divided into groups by wall parameters:

lungs;
reinforced;
ordinary.

Light tubes

The ratio of the size and mass of products is different, depend on the diameter, the thickness of the wall, the steel grade, the method of processing material (galvanized, neoscanic).

Table 1. Mesh parameters on steel pipes

Conditional pass DU (mm)	Side / wall thickness - S (mm)	Outer diameter - DH (mm)	Weight (1 m in kg)	Number of meters in 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

dU (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

Strengthened pipes are distinguished by an increased wall thickness, and, accordingly, greater weight 1 of the route. Such products are used for water supply and gas transportation under greater pressure.

Table 3. Grid of parameters on 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

Pipes for thread

Steel pipes plants are manufactured by order of the consumer. Therefore, dimensions: length, diameter, wall thickness, execution, may be different. Pipes with chopped carvings are in great demand. Products are characterized by a high price, but on the other hand, adapted for simple installation without welding.

The threads are determined by the method of execution:

The rolling method is the most reliable method at which compliance with the standards is taken into account before the smallest detail. Permissible deviations: decrease in diameter from inside by 10%.
Outdoor thread cutting on the product.

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

Table 5. Thread Parameters for VGP Pipes

dU (mm)	Size to escape (mm)		Number of threads when passing
dU (mm)	short	long	Number of threads when passing
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	-

It should be noted that the listed types of pipes (reinforced, light, ordinary) after the galvanizing are becoming heavier than 3% than products from ferrous metal. But the limit parameter of the mass deflection should not exceed more than 8% (for the party - 10%) according to GOST.

Technical requirements for steel water-gas pipes

Gas produced pipes are made exclusively in accordance with the above-mentioned norms. Materials used for products are installed GOST 380 and 1050. This steel eliminates mechanical and chemical impurities. Requirements for gas pipes made of steel are characterized by the following principles: welded, with carvings, galvanized, black.

Steel welded pipes

Requirements and tolerances for GOST to welded steel pipes:

In the places of seams - a decrease of up to 0.5 mm in diameter. Only when the product is performed by the method of oven welding. And if in these places there is a hollow seal along the inner diameter - up to 1 mm.
The ends of products in need of welding with a wall thickness of 5 mm are treated under chamfer with an angle of 35-40 degrees towards the end. The end ring must match the width (volume) in 1-3 mm.
Pipes with DY from 20 mm on the surface of the inner wall must have graph in flattened or cut. The height of this graph is not higher than 0.5 mm. With the same conditions, but with the parameters of the water-gas pipe with a passage of 15 mm and including the manufacture with the hot reduction method - thickening not higher than 0.5 mm.

Steel Threaded Pipes

Tolerances and requirements for steel products with chopped threads:

The carving of water-based pipes is set to GOST 6357 (class B). Must be without burrs or torn places.
It is allowed black on the seams exclusively on a threaded area with the following parameters: a decrease in the height of the thread from the main norm is not more than 15%.
The length of the thread can be reduced to 15% (without escape), by order - up to 10%.

Galvanized steel pipes

Requirements for galvanized steel pipes:

If gas producing pipes are made with a zinc coating, the layer thickness must be 30 microns (no less). But the coating may be absent on the thread and the ends of the product.
The galvanized surface should not have bubbles, detachalies from the main material and various inclusions (oxides, charge, certzer).
The coating should be solid.
Rare inaccuracies are allowed in the form of flux spots or traces of capture on the surface.
Adjust correction (re-applying) of non-slip plots according to GOST 9307. In general, not more than 0.5% of the entire surface.

Non-scattered (black) steel products

Requirements for non-scattered steel pipes:

The couplings are manufactured according to the GOST standard: 8944, 8954, 8965 and 8966.
Cracks, sunsets, bloating or film on the surface of the product are excluded.
Small defects are allowed: traces of stripping, scale layers, dents, risks, ripples. But only if they do not increase the volume of the wall, leaving the minimum standards, and do not prevent the viewing.
The ends of the VGP pipes are cut at right angles. The size of the bevel is not more than two degrees, and burrs - not higher than 0.5 mm.

The resistance of gas pipeline pipes is checked by the following indicators:

Hydraulic pressure excerpt:
- for VGP light and ordinary: 2.4 MPa (25 kgf / cm2);
- for reinforced VGP: 3.1 MPa (32 kgf / cm2);
- for products for special price: 4.9 MPa (50 kgf / cm2).
Checking for bending gas produced products with various conditional passages (DY):
- dY to 40 mm - the radius of the surface diameter 2.5;
- dY to 50 mm - the radius of the surface diameter is 3.5.
Examination for distribution:
- dY 15 - 50 mm: no less than 7%;
- dY from 65 mm: not less than 4%.

Marking of steel water-gas pipes

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

Principles of labeling VGP pipes:

"20x2.8 GOST 3262-75" (hereinafter referred to as the GOST and number). Decoding designation:
- non-scattered ordinary pipe;
- wall thickness - 2.8 mm;
- length is non-night;
- dY - 20 mm (conditional pass);
- without thread / coupling.
"M-20х2.8". Decoding designation:
- non-scattered ordinary;
- wall thickness - 2.8 mm;
- carving is absent;
- length is non-night;
- dY - 20 mm;
- with a coupling.
"R-20X2.8-5000". Decoding designation:
- non-scattered ordinary;
- wall thickness - 2.8 mm;
- carving is present;
- length - dimensional (5 m);
- dY - 20 mm;
- no clutch.
"C-R-20X2.8". Decoding designation:
- galvanized ordinary;
- wall thickness - 2.8 mm;
- carving is present;
- length is non-night;
- dY - 20 mm;
- no clutch.
"C-R-20X2.8-4000". Decoding designation:
- galvanized ordinary;
- wall thickness - 2.8 mm;
- carving is present;
- length - dimensional (4 m);
- dY - 20 mm;
- no clutch.

Note:

the letter "H" denote pipes for pumping with carvings;
the letter "D" indicates products with long thread;
the letter "P" denote VGP tubes with increased accuracy in the manufacture.

Rules for storage, transportation, packaging VGP steel pipes

Water-gas pipes do not have specific packaging requirements. Exceptions are products with D \u003d 6 ... 20 mm. These gas producing products on the request of the customer are packaged in the bay.

When transporting the VGP pipes, it is necessary to adhere to the basic principle - the products are firmly fixed to eliminate the loss.
Yulia Petrichenko, Expert

Store gas produced pipes, based on the properties of the material:

if products with a galvanized surface, it is sufficient to fix and cover with moisture. Although these pipes are characterized by elevated anti-corrosion properties, in places free from zinc coating, a rust can be improving with high humidity;
non-scattered VGP products are stored in a dry place, excluding moisture penetration. Firmly fixed.

What pipes do you use for a gas or water supply device? What way to transport, pack or store pipes? Leave interesting facts and useful information in the comments.

The company Metallservice is delivered by the entire range of steel water-based pipes that meet the requirements of GOST 3262-75. Wholesale prices are valid for the entire metal products.

The catalog presents galvanized and non-zero products of Du 8-100 mm, having a rolled or sliced \u200b\u200bcylindrical thread either without it. Metal rolling 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 shipping rate depends on the ordered party and averages 1-12 hours.

Classification of gas produced pipes according to GOST 3262-75

There are several options for the length of products:

dimensional (4-12 m);
multiple measuring (up to 12 m, the allowance for each sub-cut - 5 mm, the longitudinal deviation along the entire length is up to 10 mm);
nemery (according to individual size, in the range of 4-12 m).

Up to 5% of the total number of non-meter PPGs, manufactured according to GOST 3262-75, can be made with a length of 1.5-4 m. On the entire length of the thread made by the rolling method, the inner diameter of 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 galvanized PPP pipes weigh 3% more non-scattered.

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

Through the thickness of the wall, the product is divided into light, ordinary and reinforced. On the products of the last two types, having a conditional passage of more than 10 mm, a carving can be applied at both ends. The choice contains products as without thread and without couplings and so and with the other.

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. Restriction of the validity of the validity of the State Standard of 12.11.91 N 1726

7. Edition (May 2007) with changes in N 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-zinc and galvanized steel welded pipes with chopped or rolled cylindrical carvings and without threads used for water pipelines and gas pipelines, heating systems, as well as for parts of water and gas pipelines.

(Modified edition, change. N 2, 3, 5).

1. Sortiment

1.1. Pipes are manufactured in size and mass given in Table 1.

At the request of the consumer of a light series pipe, designed to dump threads, are manufactured in size and mass given in Table 2.

(Modified edition, meas. N 1, 3).

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

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

never-length.

In coordinating the manufacturer with the consumer in a party of non-meter pipes, up to 5% of pipes from 1.5 to 4 m are allowed.

Table 1

Dimensions, mm.


Conditional pass	Outside diameter	Pipe wall thickness			Mass of 1 m pipe, kg
		lungs	ordinary	reinforced		ordinary	reinforced

table 2

Dimensions, mm.


Conditional pass	Outside diameter	Wall thickness	Mass of 1 m pipe, kg

Notes:

1. For a thread made by the rolling method, the pipe is allowed to reduce its inner diameter to 10% along the entire length of the thread.

2. The mass of 1 M of the pipes is calculated at the density of steel, equal to 7.85 g / cm. Galvanized pipes are heavier than non-scattered by 3%.

1.3. Limit deviations in the size of pipes should not exceed those specified in Table 3.

Table 3.


Pipe size	Limit deviation for manufacturing accuracy pipes
	normal	increased
Outer diameter with conditional passage:
up to 40 mm.	0.4 mm -0,5
over 40 mm
Wall thickness

Notes:

1. The limit deviation in the positive side of the wall thickness is limited by the limit deviations by weight of pipes.

2. Pipes of ordinary manufacturer's accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased production accuracy are used for parts of water and gas pipelines.

1.4. Limit deviations on the mass of pipes should not exceed + 8%.

At the request of the consumer, the utmost deviations by weight should not exceed:

+ 7.5% - for the party;

+ 10% - for a separate pipe.

(Modified edition, change. N 2, 5).

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

2 mm - with conditional passage up to 20 mm inclusive;

1.5 mm - with a conditional passage over 20 mm.

1.6. Threads on pipes can be long or short. Thread requirements must comply specified in Table 4.

Table 4.


Conditional passage, mm	The number of threads with conditional passage	The length of the thread before the escape, mm
		long	short

1.7. Pipes with a conditional passage 6, 8, 10.15 and 20 mm at the request of the consumer are wound into the bay.

Examples of conventional designations

The pipe is ordinary, non-zero, the usual accuracy of manufacture, non-meter length, with a conditioned passage of 20 mm, the thickness of the wall is 2.8 mm, without thread and without clutch:

Pipe 20x2,8GOST 3262-75

The same, with a clutch:

Pipe M-20X2.8GOST 3262-75

The same, measuring length, with carvings:

P-20X2.8-4000 pipeGOST 3262-75

The same, with zinc coating, neotoral length, with carvings:

Pipe c-p-20x2.8GOST 3262-75

The same, with zinc coating, measuring length, threaded:

Pipe c-p-20x2,8-4000GOST 3262-75

For pipes for pumping the thread in the conditional designation after the word "tube" indicates the letter N.

For pipes with long threads in the symbol after the word "tube" indicates the letter D.

For pipes of increased accuracy of manufacture in the symbol after the size of the conditional pass, the letter P. is indicated

(Modified edition, meas. N 1).

2. Technical requirements

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

Pipes for parts of water and gas pipeline structures are manufactured from steels according to GOST 1050.

2.2. At the request of the consumer at the ends of the pipes to be welded, the thickness of the wall is 5 mm and more, chamfer should be removed at an angle of 35 ° -40 ° to the tube's end. In this case, an ends of 1-3 mm width should be left.

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

2.1, 2.2. (Modified edition, meas. N 3, 4).

2.3. At the request of the consumer, the pipes are staffed with couplings made according to GOST 8944, GOST 8954, GOST 8965 and GOST 8966, based on one coupling for each pipe.

(Modified edition, meas. N 3).

2.4. Cracks, captives, fuses and sunsets are not allowed on the surface of the pipes.

In the ends of the pipes are not allowed bundles.

Separate dents, risks, risks, traces of stripping and other defects caused by the method of production, if they do not remove the wall thickness for the minimum sizes, as well as a scale layer that does not interfere with the inspection.

On pipes made by the method of oven welding, a decrease in the outer diameter is allowed to 0.5 mm in the presence of a gentle thickening along the inner diameter of not more than 1.0 mm in this place.

(Modified edition, meas. N 3, 4).

2.5. At the request of the consumer on pipes with a conditional passage of 20 mm and more on the inner surface of the seam of pipes, the graph should be cut or flattened, while the height of the graph or its traces should not exceed 0.5 mm.

At the request of the consumer on pipes with a conditional passage of more than 15 mm, made by oven welding and the method of hot reduction, on the inner surface of the pipes in the seam zone is allowed by a hollow thickening with a height of no more than 0.5 mm.

(Modified edition, change. N 2, 3, 4, 5, 6).

2.6. The ends of the pipes must be trimmed at right angles. The magnitude of the end of the end is not more than 2 °. The remains of burrs should not exceed 0.5 mm. When removing burrs, the formation of dulling (rounding) of the ends is allowed. It is allowed to cut the pipes in the line line.

In coordination of the manufacturer with the consumer on pipes with a conditional passage of 6-25 mm, made by the method of oven welding, burrs are allowed to 1 mm.

(Modified edition, change. N 4, 6).

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

On the surface of galvanized pipes, bubbleness and extraneous inclusions are not allowed (Gartsink, oxides, the stitching mixture), peeling the coating from the base metal.

Separate flux spots and traces of pipe capture lifting devices, roughness and minor local zinc influx are allowed.

It is allowed to correct individual non-scattered sections by 0.5% of the outer surface of the pipe according to GOST 9.307.

(Modified edition, meas. N 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm) - Ordinary and light tubes;

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

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

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

At the request of the consumer of the pipes must withstand a test for distribution:

for pipes with a conditional passage from 15 to 50 mm - at least 7%;

for pipes with a conditional passage of 65 mm and more - at least 4%.

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

2.8, 2.9. (Modified edition, change. 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 be complied with GOST 1050.

2.11. The carving of the pipes must be clean, without ribbon and burrs and correspond to GOST 6357, the class of accuracy V.

Cylindrical carving pipes are used when assembling with seals.

2.10, 2.11. (Modified edition, meas. N 3, 4).

2.12. In place of the seam allowed black on thread threads, 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%.

It is allowed on thread threads with torn (for sliced) or incomplete (for rolling) thread, provided that their length in the amount 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 a thread reduction of the useful thread length (without escape) to 15% compared with the one specified in Table 4, and at the request of the consumer - up to 10%.

2.12, 2.13. (Modified edition, change. N 2, 3, 5).

2.14. Drawing threads to galvanized pipes are carried out after galvanizing.

2.15. (Excluded, meas. N 3).

2.16. At the request of the consumer, the weld seams of the pipes are controlled by non-destructive methods.

(Modified edition, meas. N 5).

3. Rules of acceptance

3.1. Pipes take parties. The party must consist of pipes of the same size, one steel grade and accompanied by one quality document in accordance with GOST 10692 with a supplement for pipes intended for the manufacture of parts of water and gas pipelines, from steel according to GOST 1050; The chemical composition and mechanical properties of steel - in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.

Party mass - no more than 60 tons.

(Modified edition, meas. N 3, 4).

3.2. Verification of the surface, sizes and curvatures subjected each part of the party.

It is allowed to apply statistical control methods according to GOST 18242 * with a normal level. Control plans are established in coordinating the manufacturer with the consumer.
________________
* GOST R 50779.71-99 is valid on the territory of the Russian Federation.

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

(Modified edition, change. N 3, 4, 5).

3.3. To control the thread parameters, for testing for distribution, flattening, bend, the height of the inner graph, the residues of the burrs, the right angle and the chamfering angle (for pipes with beveled edges), mechanical properties take no more than 1%, but at least two batch pipes, And for pipes made by the method of continuous oven welding, two pipes from the party.

(Modified edition, meas. N 3, 4).

3.4. All pipes are monitored.

(Modified edition, meas. N 3).

3.5. Hydraulic pressure testing each pipe. With 100% control of the quality of the weld with non-destructive methods, the test of hydraulic pressure is allowed not to be carried out. In this case, the ability of pipes to withstand test hydraulic pressure is guaranteed.

(Modified edition, meas. N 6).

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

(Modified edition, meas. N 2).

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

Results of repeated tests apply to the entire batch.

4. Test methods

4.1. To control the quality from each selected tube, one sample is cut for each type of test.

Tensile test is carried out according to GOST 10006. It is allowed instead of tensile test to monitor mechanical properties by non-destructive methods.

(Modified edition, meas. N 3, 6).

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

4.3. The hydraulic test is carried out according to GOST 3845 with an exposure under test pressure of at least 5 s.

4.4. Test for bending is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Modified edition, meas. N 3).

4.4A. Distribution test is carried out according to GOST 8694 on a conical mandrel with an angle of tapering 6 °.

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

(Modified edition, meas. N 3, 4).

4.4b. Test on flattening is carried out according to GOST 8695.

(Modified edition, meas. N 3).

4.4B. The control of the weld is carried out by non-destructive methods on the regulatory documentation.

(Introduced additionally, meas. N 3).

4.5. The thickness of the zinc coating on the outer surface and in the available places of the inner surface is controlled according to GOST 9.301 and GOST 9.302, as well as instruments of types of MT-41TC, MTZON or type "pulse" on regulatory documentation.

4.6. Threads are checked with threaded rings in GOST 5378 with both ends of the pipe.

The length of the pipes is measured by a roulette according to GOST 7502. Threads are controlled by calibers according to GOST 2533.

Control of the mass of the batch of pipes is carried out on scales not more than 10 tons with the price of dividing no more than 20 kg.

(Modified edition, change. N 3, 4, 5, 6).

4.10. The control of the weld is carried out by non-destructive methods for technical documentation.

(Introduced additionally, meas. N 4).

5. Marking, Packaging, Transportation and Storage

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

5.1.1. The carving of pipes should be protected from mechanical damage and corrosion by lubricant on regulatory documentation.

Section.5. (Modified edition, meas. N 3).

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GOST 3262-75 Steel water pipe pipes. Technical conditions

Categories GOST 3262-75 OKS:

23.40. Pipelines and their components
23.40.10 Cast iron and steel pipes * Steel pipes and special purpose tubes See 77.140.75

Document status: Acts, entered into force 01.01.1977 Name in English: Water-Supply and Gas-Supply Steel Pipes. Specifications. Date of updating information on the standard: 09/11/2019, at 10:56 (less than 3 months ago) Type of Standard: Standards for products (services) The start date of the GOST: 1977-01-01 Date of the last edition of the document: 2007-05-01

Document codes GOST 3262-75:

OKP code: 138500;138501 KGS code: B62. OKSTO code: 1385

Number of pages: 8

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

Untilty index (s): 534731 The document was developed by the Org-her: Ministry of Intelligence of the USSR Keywords of the document: test, accept, sortman, technical requirements, pipes of neoscakes, gunning pipes, pipes welded, steel pipes

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

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GOST 3262-75

Group B62.

Interstate standard

Steel water pipes

Technical conditions

Water-Supply and Gas-Supply Steel Pipes. SPESIFICATIONS.

OKP 13 8500, OKP 13 8501

Date of introduction 1977-01-01

Information details

1. Designed and introduced by the Ministry of Black Metallurgy of the USSR

Developers

V.I.Trazhok, Cand. tehn sciences; V.M.Vorone, Cand. tehn sciences; Yu.M.Mironov, Cand. tehn sciences; A.I.Postolova

2. APPROVED AND INTRODUCED RESOLUTION OF THE STATE COMMITTEE OF THE USSR on Standards from 11.09.75 N 2379

3. The frequency of verification - 5 years

4. Instead of GOST 3262-62

5. Reference regulatory and technical documents


	Point number

________________
* On the territory of the Russian Federation acts.

6. Restriction of the validity of the validity of the State Standard of 12.11.91 N 1726

7. Edition with changes in N 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-zinc and galvanized steel welded pipes with chopped or rolled cylindrical carvings and without threads used for water pipelines and gas pipelines, heating systems, as well as for parts of water and gas pipelines.

(Modified edition, change. N 2, 3, 5).

1. Sortiment

1.1. Pipes are manufactured in size and mass given in Table 1.

Table 1

Dimensions, mm.


Conditional pass	Outside diameter	Pipe wall thickness			Mass of 1 m pipe, kg
		lungs	outline	reinforced	lungs	outline	reinforced

At the request of the consumer of a light series pipe, designed to dump threads, are manufactured in size and mass given in Table 2.

table 2

Dimensions, mm.


Conditional pass	Outside diameter	Wall thickness	Mass of 1 m pipe, kg

Notes:

1. For a thread made by the rolling method, the pipe is allowed to reduce its inner diameter to 10% along the entire length of the thread.

2. The mass of 1 M of the pipes is calculated at the density of steel, equal to 7.85 g / cm. Galvanized pipes are heavier than non-scattered by 3%.

(Modified edition, meas. N 1, 3).

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

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

Never-length.

In coordinating the manufacturer with the consumer in a party of non-meter pipes, up to 5% of pipes from 1.5 to 4 m are allowed.

1.3. Limit deviations in the size of pipes should not exceed those specified in Table 3.

Table 3.


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

Notes:

1. The limit deviation in the positive side of the wall thickness is limited by the limit deviations by weight of pipes.

2. Pipes of ordinary manufacturer's accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased production accuracy are used for parts of water and gas pipelines.

1.4. Limit deviations on the mass of pipes should not exceed + 8%.

At the request of the consumer, the utmost deviations by weight should not exceed:

7.5% - for the party;

10% - for a separate pipe.

(Modified edition, change. N 2, 5).

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

2 mm - with conditional passage up to 20 mm included.;

1.5 mm - with a conditional passage over 20 mm.

1.6. Threads on pipes can be long or short. Thread requirements must comply specified in Table 4.

Table 4.


Conditional passage, mm	The number of threads with conditional passage	The length of the thread before the escape, mm
			short

1.7. Pipes with a conditional passage 6, 8, 10.15 and 20 mm at the request of the consumer are wound into the bay.

Examples of conventional designations

The pipe is ordinary, non-zero, the usual accuracy of manufacture, non-meter length, with a conditioned passage of 20 mm, the thickness of the wall is 2.8 mm, without thread and without clutch:

Pipe 20x2.8 GOST 3262-75

The same, with a clutch:

Pipe M-20x2.8 GOST 3262-75

The same, measuring length, with carvings:

P-20X2.8-4000 GOST 3262-75

The same, with zinc coating, neotoral length, with carvings:

Pipe c-p-20x2.8 GOST 3262-75

The same, with zinc coating, measuring length, threaded:

Pipe c-p-20x2,8-4000 GOST 3262-75

For pipes for pumping the thread in the conditional designation after the word "tube" indicates the letter N.

For pipes with long threads in the symbol after the word "tube" indicates the letter D.

For pipes of increased accuracy of manufacture in the symbol after the size of the conditional pass, the letter P. is indicated

(Modified edition, meas. N 1).

2. Technical requirements

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

Pipes for parts of water and gas pipeline structures are manufactured from steels according to GOST 1050.

2.2. At the request of the consumer at the ends of the pipes to be welded, the thickness of the wall is 5 mm and more, chamfer should be removed at an angle of 35-40 ° to the tube's end. In this case, an ends of 1-3 mm width should be left.

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

2.1, 2.2. (Modified edition, meas. N 3, 4).

2.3. At the request of the consumer, the pipes are completed with couplings made by software, and, at the rate of one coupling for each pipe.

(Modified edition, meas. N 3).

2.4. Cracks, captives, fuses and sunsets are not allowed on the surface of the pipes.

In the ends of the pipes are not allowed bundles.

Separate dents, risks, risks, traces of stripping and other defects caused by the method of production, if they do not remove the wall thickness for the minimum sizes, as well as a scale layer that does not interfere with the inspection.

On pipes made by the method of oven welding, a decrease in the outer diameter is allowed to 0.5 mm in the presence of a gentle thickening along the inner diameter of not more than 1.0 mm in this place.

(Modified edition, meas. N 3, 4).

At the request of the consumer on pipes with a conditional passage of more than 15 mm, made by oven welding and the method of hot reduction, on the inner surface of the pipes in the seam zone is allowed by a hollow thickening with a height of no more than 0.5 mm.

(Modified edition, change. N 2, 3, 4, 5, 6).

In coordination of the manufacturer with the consumer on pipes with a conditional passage of 6-25 mm, made by the method of oven welding, burrs are allowed to 1 mm.

(Modified edition, change. N 4, 6).

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

On the surface of galvanized pipes, bubbleness and extraneous inclusions are not allowed (Gartsink, oxides, the stitching mixture), peeling the coating from the base metal.

Separate flux spots and traces of pipe capture lifting devices, roughness and minor local zinc influx are allowed.

It is allowed to correct individual non-scattered sections by 0.5% of the outer surface of the pipe according to GOST 9.307.

(Modified edition, meas. N 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm) - Ordinary and light tubes;

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

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

At the request of the consumer of the pipes must withstand a test for distribution:

For pipes with a conditional passage from 15 to 50 mm - at least 7%;

For pipes with a conditional passage of 65 mm and more - at least 4%.

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

2.8, 2.9. (Modified edition, change. 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 be complied with GOST 1050.

2.11. Carving pipes must be clean, without ribbon and burrs and fit, the class of accuracy V.

Cylindrical carving pipes are used when assembling with seals.

2.10, 2.11. (Modified edition, meas. N 3, 4).

2.12. In place of the seam allowed black on thread threads, 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%.

It is allowed on thread threads with torn (for sliced) or incomplete (for rolling) thread, provided that their length in the amount 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 a thread reduction of the useful thread length (without escape) to 15% compared with the one specified in Table 4, and at the request of the consumer - up to 10%.

2.12, 2.13. (Modified edition, change. N 2, 3, 5).

2.14. Drawing threads to galvanized pipes are carried out after galvanizing.

2.15. (Excluded, meas. N 3).

2.16. At the request of the consumer, the weld seams of the pipes are controlled by non-destructive methods.

(Modified edition, meas. N 5).

3. Rules of acceptance

3.1. Pipes take parties. The party must consist of pipes of the same size, one brand of steel and accompanied by one quality document in accordance with the supplement for pipes intended for the manufacture of parts of water and gas pipeline structures, from steel software; The chemical composition and mechanical properties of steel - in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.

Party mass - no more than 60 tons.

(Modified edition, meas. N 3, 4).

3.2. Verification of the surface, sizes and curvatures subjected each part of the party.

It is allowed to apply statistical methods for controlling the software with a normal level. Control plans are established in coordinating the manufacturer with the consumer.

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

(Modified edition, change. N 3, 4, 5).

(Modified edition, meas. N 3, 4).

3.4. All pipes are monitored.

(Modified edition, meas. N 3).

(Modified edition, meas. N 6).

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

(Modified edition, meas. N 2).

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

Results of repeated tests apply to the entire batch.

4. Test methods

4.1. To control the quality from each selected tube, one sample is cut for each type of test.

Tensile test is carried out according to GOST 10006. It is allowed instead of tensile test to monitor mechanical properties by non-destructive methods.

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

4.3. The hydraulic test is carried out with shutter speed under test pressure at least 5 s.

4.4. Test for bending is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Modified edition, meas. N 3).

4.4A. Distribution test is carried out on a conical mandrel with an angle of tapering 6 °.

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

(Modified edition, meas. N 3, 4).

4.4b. Test on flattening is carried out according to GOST 8695.

(Modified edition, meas. N 3).

4.4B. The control of the weld is carried out by non-destructive methods on the regulatory documentation.

(Introduced additionally, meas. N 3).

4.5. The thickness of the zinc coating on the outer surface and in the available places of the inner surface control the software and, as well as the instruments of the types of MT-41TC, MTZON or the type of "impulse" on the regulatory documentation.

4.6. Threads are tested by threaded calibers-rings of software (third accuracy class).

In this case, no more than three revolutions should be screwed in the thread.

(Modified edition, meas. N 3, 4).

4.7. The curvature of pipes is controlled by the calibration line of the software and a set of probe on ND.

(Modified edition, meas. N 3, 5).

4.8. The straight angle of the ends of the pipes is controlled by a 90 ° coated with a size of 160x100 mm class 3 of the software, plate-ups of a set of 4 nd or a tilter according to GOST 5378. The chamfer bevel angle is controlled by a tilter according to GOST 5378.

(Modified edition, meas. N 3, 6).

4.9. Control of outer diameter is carried out by smooth micrometers of software, Cable Calibers, or GOST 18360.

The wall thickness, the height of the inner graph and the height of the burrs are measured by a micrometer for or by a wall-acting software with both ends of the pipe.

The length of the pipes is measured by a tape measure according to GOST 7502. The threads are controlled by calibers according to GOST 2533.

Control of the mass of the batch of pipes is carried out on scales not more than 10 tons with the price of dividing no more than 20 kg.

(Modified edition, change. N 3, 4, 5, 6).

4.10. The control of the weld is carried out by non-destructive methods for technical documentation.

(Introduced additionally, meas. N 4).

5. Marking, Packaging, Transportation and Storage

5.1. Marking, packaging, transportation and storage are carried out with an addition.

5.1.1. The carving of pipes should be protected from mechanical damage and corrosion by lubricant on regulatory documentation.

Section.5. (Modified edition, meas. N 3).

The text of the document is drilled by:
official edition
Metal pipes and connecting parts to them.
Part 3. Welded pipes. Profile pipes: Sat. Gostov. -
M.: IPK Publishing standards, 2001

GOST 3262-75 is a regulatory document, according to which steel water-gas pipes produce. With such pipes that, unlike plastic products, can be successfully operated in open areas, carry out the installation of pipelines for transporting liquid and gaseous media. There are practically indispensable to such steel pipes in the field of capital and private construction, housing and communal services, agriculture.

You can familiarize yourself with the requirements of GOST to steel water-gas pipes by downloading the document in the PDF format on the link below.

General information about steel pipes VGP

Water-gas steel pipes whose parameters are determined by GOST 3262-75, refer to the target products, which and the name says. The differences in their types are primarily in the production method. However, to whatever type of steel pipes under consideration of the category, all of their parameters are negotiated by the provisions of such a document as GOST 3262 (75, 80, 85, 91).

So, according to this standard (3262-75, the latest revision of the 91st year), water-based pipes manufactured by the weld can belong to one of the following types:

non-scattered;
galvanized;
initially made with threads at the ends, which can be obtained by cutting or rolling;
without thread.

Application scope and individual parameters

The main areas of use of water-gas pipes, geometrical parameters and the technical characteristics of which are complied with the standard 3262-75, - construction and repair. The pipes of this category are used to arrange gas, plumbing communications and heating systems in cottages and buildings of multi-unit type, administrative buildings, educational institutions, agricultural, industrial and any other objects.

So, this type of metal is used in:

communications of cold, as well as hot water supply;
heating systems;
gas pipelines.

GOST 3262 (75, 80, 85, 91) assumes that welded can be produced measuring, multiple dimensional and non-meter length. So, according to this gradation, they have the following dimensions (along the length of products produced):

dimensional - 4 to 12 m long;
having a length, multiple dimensional value;
nemers with a length that are within the dimensional value.

The size of the wall is the criterion by which water-gas pipes are distinguished:

ordinary;
lungs;
reinforced.

The reinforced PPP pipes are products (sometimes galvanized), the wall thickness in which are increased (respectively, such products have more weight). They are used to mount pipelines, along which liquid or gaseous media is transported under high pressure.

If the technical characteristics and the main geometrical parameters of water-based tubes are governed by the regulatory document, then the variant of their constructive design and the length of the cutting defines the customer. Thus, the pipes are most popular, at the ends of which thread is cut in the production process. The reason for their high popularity is that it does not need to use welding operations.

Thread on PPP pipes can be created in the process of their production:

kump (technology that allows to obtain threads with the most accurate parameters, while it is assumed that the inner diameter of the pipe will be less than 10%);
cutting.

The carving on the VGP pipes on the wish of the customer is cut or rolls, and it can be both short and long.

When calculating the mass of water-gas pipes should be borne in mind that galvanized products weigh 3% more than made of ferrous metal. On the batch deviations, the standard also imposes a limitation: they should not exceed 8%.

Technical requirements

From the pipes of each type a sortment is formed, in which their geometrical parameters and theoretical weight are listed.

Steel from which the PPPs categories are manufactured must also comply with the requirements specified in GUT (380, 1050), with mechanical properties, as well as the chemical composition of the manufacturing material are not normalized. To each type of pipes (welded, from ferrous metal, galvanized, threaded) there are special technical requirements on which it should be stopped in more detail.

Welded

In accordance with the provisions of the GOST, the following requirements are presented to the pipes of the category of WGP welded type.

If pipe products are connected by oven welding technology, then in the weld area, their outer diameter can be reduced by half a millionth. In the presence of a seam of gentle thickening on the inside of the seam, its value should not exceed 1 mm.
If with the help of welding, it is necessary to connect water-gas pipes, the wall thickness of which is more than 5 mm, then at their ends, the champers are removed at an angle of 35-40 degrees. At the same time, the width of the end ring after the chamfer removal should be in the range of 1-3 mm.
On the inner part of the weld of water-wire pipe, the diameter of which exceeds 20 mm, the excess metal must be cut or flattened so that its height does not exceed half a million.
The customer may additionally specify the characteristics of products with an internal passage diameter of more than 15 mm produced using hot reduction technology (exhaust) and combined with oven welding. According to such requirements, the hollow thickening may be present on the inside of the weld, the height of which is no more than 0.5 mm.

Threaded

Water-gas pipes, thread at the ends of which is cut or rolls the manufacturer, should have the following parameters.

The thread formed at the ends of the water-gas pipes in the factory conditions must correspond to the category of accuracy "B". Its characteristics are negotiated by the provisions of the GOST 6357. So, the thread should be clean, there can be no Rvanin and burrs.
In places of compounds, threads are possible on the turns of the thread, while the height of the thread profile in such places should not be reduced more than 15%. The customer has the right to set tighter requirements for which the thread profile reduction limit can be reduced to 10%.
The useful thread length (specified in the sorting and measured without escape) can be reduced to 15%, but the customer has the right to reduce the value of this deviation to 10%.

Galvanized

The zinc layer, which is applied to the entire surface of the water-gas pipe in the factory conditions, should have a thickness of at least 30 microns. It is assumed that there may be no zinc coating on sections with chopped threads and on the ends.
The zinc film must be applied to qualitatively, it does not allow bubbles, detachments from the base metal and extraneous inclusions (oxides, the stitching, zinc waste, etc.).
Guest is allowed on the surface of galvanized flux spots, small spills of zinc, roughness and traces, which leave elements of lifting devices.
If areas not covered with zinc are detected on water-gas pipes, then their re-processing is possible - provided that the total area of \u200b\u200bsuch sites does not exceed 0.5% of the area of \u200b\u200bthe entire surface of this product.

Without zinc coat

The customer can specify with the manufacturer a complete set of guest couplings (8944, 8954, 8965, 8966) - one coupling on each product.
On the surface of the pipes, such defects are excluded such as bloating, sunsets, cracks, oxide film, and on the ends of products - bundles.
On the surface of water-gas pipes, the presence of separate defects, which are due to the production method (ripples, risks, dents, traces of stripping). At the same time, such defects should not reduce the thickness of the pipe wall below the tolerance specified in the assortment. The scale layer may also be present, but it should not prevent the product inspection.
The ends of the water-wire pipes released by the consumer are trimmed at right angles. SCOS, if it occurs when trimming, should not exceed 2 degrees. The magnitude of the burrs remaining after trimming should not exceed half a millionth.

The regulatory document also negotiates the methods of control, which is mandatory all pipes are subject to the water supply category:

Hydraulic pressure test that must withstand pipes:
- ordinary and light type - 25 kgf / cm2 (2.4 MPa);
- reinforced - 32 kgf / cm2 (3.1 MPa);
- Appropriate special requirements - 50 kgf / cm2 (4.9 MPa).
Tests for bend, conducted on mandrels with a radius comprising:
- 2.5 size of the outer diameter - products with Du up to 40 mm;
- 3.5 sizes of outer diameter - pipes with Du 50 mm.
Distribution test for water-based pipes with Du:
- 15-50 mm - no less than 7%;
- More than 65 mm - at least 4%.