Pipe Electros welded water-base GOST 3262 75. Steel water pipes

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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).

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. 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).

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.

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

The water and gas pipeline will be made of steel for a long time. Alternatives - metal-plastic waterways, ceramic, can be used only at certain sites: local water pipes, non-pressure sewage, communication inside the building. However, with above ground installation, the pipeline is exposed to too strongly affected by weather factors. This eliminates the use of plastic or other products.

Characteristics of VGP

Water and gas pipes are made of steel blanks - strips, forming method. The edges of the workpiece are brewed. Seam used enhanced. The seam study is the first task of quality control, as it is a place of increased risk. According to GOST 3262-75, radiography is used to determine the quality.

Water-gas pipes are generally manufactured directly, since for these products more important quality is resistance to internal pressure, and not resistance to external loads. In the photo - gas pipeline.

Benefits:

high strength, which allows the use of products with any installation method and on any sections;
oxygen and gas impermeability are precisely those properties due to which gas pipelines are constructed and will be constructed only from steel products;
low expansion coefficient - temperature drops and moisture do not affect the material. The pipeline does not expand, which allows the use of rigid fastening and does not require a device of compensation tools;
durability - with proper maintenance is 50 years;
available cost.

Disadvantages:

quite a big weight, which makes it difficult to install and requires a large amount of fasteners;
the need for preventive maintenance - metal accumulates electricity;
the need for thermal insulation when laying into the ground - the freezing liquid is expanding, while the parameters of the water duty remain unchanged. This leads to damage and breaks.

Parameters VGP

Dimensions and possible deviations are regulated by GOST 3262-75.

Outer diameter - from 33 to 165 mm.
Wall thickness - from 1 to 5.5 mm.
Length - Never ranges from 4 to 12 m, measured 4-8 or 8-12 m.

Since we are talking about plumbing pipes, instead of the internal diameter value, this indicator is used as a conditional passage. It is given both in inches and in mm.

Varieties of products

Different way to laying the pipeline and different operating conditions involve excellent technical specifications. Rental produces several modifications.

Classification by material

The raw material in the manufacture of water-gas pipes is carbon steel of various brands. In this case, GOST 3262-75 is regulated by two types of products:

water expenditures of ordinary accuracy - only the mechanical quality of the product is controlled. The chemical composition of steel is not investigated. Products are used for household communications systems;
the pipeline made of increased accuracy - galvanized steel in manufacturing, mechanical properties are normalized by GOST 3262-75. Products are used in the construction of large highways, where high pressure resistance is important.

In fact, both types of water-water pipes are made of steel, but there are different levels of control. As a result, get:

black - without galvanizing, are more often used when laying gas highways;
galvanized - finished products are subjected to galvanizing - immersion in the zinc melt. On the inner and outer surface of the product, a protective layer is formed, which protects against corrosion. Large waterways are constructed from galvanized VGPs.

Form release

Pipe water-base GOST 3262-75 produced:

threaded at the ends (rolling or cutting) - it is worth noting that the protective layer is damaged during welding, and therefore galvanized products are mounted only by a threaded method;
no thread - a welded joint is assumed.

Resistance to the hydraulication

The wall thickness of the waterproofing determines the strength and resistance to a certain hydraulic pressure. Classification is as follows:

lightweight - working fluid pressure should not exceed 25 kg / kV. cm;
ordinary - implies the same pressure, but allows hydrowards;
reinforced - pressure can reach a value of 32 kg / kV. cm.

Designation:	GOST 3262-75 *
Name Rus:	Steel water pipes. Technical conditions
Status:	suitable
Replaces:	GOST 3262-62.
Text update date:	01.10.2008
Date to add to the database:	01.02.2009
Date of introduction:	01.01.1977
Designed:	Ministry of Black Metallurgy of the USSR
Approved:	State Committee of the USSR on standards (09/11/1975)
Published:	Standards Publishing House No. 1994

Steel pipes pipes

Technical conditions

GOST 3262-75

Publishing standards

Moscow

State Standard of the Union of SSR

dateadministration 01.01.77

This standard protrudescent on non-zinc and galvanized steel welded pipes are covered with or rolled cylindrical carvings and without threads used for the route and gas pipelines, heating systems, as well as for detailing and gas pipelines.

1. Sortiment

1.1. Pipes produce samples and mass shown in Table. one.

At the request of the consumer of the lightweight series, designed to pump the thread, are manufactured by the mass of the mass given in Table. 2.

(Modified editors, meas. Number 1 , 3 ).

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

dimensional or multiple mertaline with a bunch for each cut 5 mm and the limit deviation to the entire length of 10 mm;

never-length.

In coordination of the manufacturer of the consumer in the neuroral batch batch, 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
Conditional pass	Outside diameter		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 knobs, the pipe is allowed to reduce its internal gear meter 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 3. Calcated pipes are heavier than non-scattered by 3%.

1.3. Limit deviations of pipe sizes should not exceed those specified in Table. 3.

Table 3.

Dimensions of pipes	Limit deviations for manufacturing accuracy pipes
		increased
Outer diameter with conditional passage:
up to 40 mm.
	- 0,5
Outer diameter with conditional passage: Over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes:

1. The limit deflection of the positive side of the wall thickness is limited to the limit disabilities of pipes.

2. Pipe production accuracy is used for water pipelines, gas pipelines and systems. Pipes of increased production accuracy are used for detail and gas pipeline structures.

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

At the request, consumer deviations for mass should not exceed:

7.5% - for the party;

10% - for an individual.

(Modified edition, change No. 2, 5).

1.5. The curvature of pipes per MDLIN should not exceed:

2 mm - with a conditional passroad 20 mm included.;

1.5 mm - with a conditional passing of 20 mm.

1.6. Pipes on pipes can be long or short. Thread requirements must match the specified Table. four.

Table4.

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

1.7. Pipes with a conditional pressure of 6, 8, 10, 15 and 20 mm at the request of the consumer are wound into rebellion.

Examples of conditional substantives

Truck ordinary, non-zinc, conventional accuracy of manufacture, non-meter length, with a conditional pressure of 20 mm, wall thickness 2.8 mm, without thread and without clutch:

Pipe 20.´ 2.8 GOST 3262-75

The same, with a clutch:

Pipe M-20´ 2.8 GOST 3262-75

The same, dimensional length, cutting:

Pipe P-20´ 2.8 - 4000 GOST 3262-75

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

Pipe C-P-20´ 2.8 GOST 3262-75

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

Pipe C-P-20´ 2.8 - 4000 GOST 3262-75

For pipes for pumping a threaded conditional designation after the word "tube" indicates the letter N.

For pipes with long threads, the letter D. is indicated after the word "tube"

For pipes of increased accuracy in conditional designation after the size of the conditional passage indicated by P.

(Modified edition, change No. 1).

2. Technical requirements

2.1. Pipes are manufactured with intercommunications with the requirements of this Standard and in technological models approved in the prescribed manner, from Steel according to GOST380 and GOST1050 without rationing mechanical properties and chemical composition.

Pipes for detailing and gas pipeline structures are manufactured from steels according to GOST1050.

2.2. According to the requirement at the ends of the pipes to be welded, with a wall thickness of 5 mm and more, chamfer must be removed at an angle of 35-40 ° To the trough of the pipe. There should be an ends of 1 - 3 mm width of 1 - 3 mm.

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

2.1; 2.2. (Modified edition, change No. 3, 4).

2.3. Upon the requirement of pipes, the pipes are staffed with couplings made according to GOST8944, GOST8954, GOST8965 and GOST8966 at the rate of each coupling for each pipe.

(Modified edition, change No. 3).

2.4. Cracks, captives, swolings and sunsets are prevented on the surface of the pipes.

In the ends of the pipes are prevented stratification.

Separate-stranded, ripples, risks, traces of stripping and other defects, due to the production of production, if they do not derive the wall thickness for mining sizes, as well as a layer of scale, which does not interfere with the inspection.

On pipes manufactured by furnace welding, a decrease in the outer diameter of up to0.5 mm is allowed in the presence of a gentle thickening in the inner diameter of the internal diameter.

(Modified edition, change No. 3, 4).

2.5. Upon the requirement on the pipes on pipes with a conditional passage of 20 mm and more on the internal suture of the seam of pipes, the graph should be cut or flattened, while the height of the grades of its traces should not exceed 0.5 mm.

At the request of the consumer of natrubs by a conditional passage of more than 15 mm, made by the method of oven welding by the content of hot reduction, on the inner surface of the pipes in the zone of the shvadopuskah flip thickening with a height of no more than 0.5 mm.

(Modified edition, change No. 2, 3, 4, 5, 6).

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

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

(Modified edition, change No. 4, 6).

2.7. Galvanized pipes 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 robbing, bubbleness and extraneous inclusions (Gartsink, oxides, stitching), peeling the coating from the base metal are not allowed on the surface.

Separate fuel stains and traces of pipe capture of pipes with lifting devices, roughness minor local zinc influx are allowed.

It is allowed by correction of non-zinc sections by 0.5% of the outer surface of the pipe according to GOST9.307.

(Modified edition, change No. 3, 4).

2.8. Pipes must be hydraulic pressure:

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

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

At the request of consumers should withstand hydraulic pressure of 4.9 MPa (50 kgf / cm 2)

2.9. The pipes with a conditional pressure of up to 40 mm inclusively must withstand the bend test of around the flexion by a radius equal to 2.5 outer diameter, and with a conditional passage of 50 mm-on the mandrel with a radius equal to 3.5 outer diameter.

At the request of consumers must withstand the test for distribution:

for pipes conditional track 15 to 50 mm - at least 7%;

for pipes with conditional passage65 and more - at least 4%.

At the request of consumers must withstand the tension on flattening to the distance to the distance surfaces equal to 2/3 of the outerness of the pipes.

2.8,2.9. (Modified edition, change No. 2, 3, 5).

2.10. Upon request, the mechanical properties of pipes for the parts of water and gas pipelines must comply with GOST1050.

2.11. Carving pipes should be pure, without ribbon and burrs and correspond to GOST6357, the class of accuracy V.

Cylindrical tubes are used when assembling with seals.

2.10; 2.11. (Modified edition, change No. 3, 4).

2.12. In place, a reservoir on thread threads, if the reduction in the normal height of the profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

It is allowed on the threads of the Nutkais torn (for sliced) or incomplete (for the rolled) thread, provided that their length in the amount does not exceed 10% of the required thread length, and at the request does not exceed 5%.

2.13. It is allowed on the threading of the useful thread length (without escape) to 15% compared with the specified B, and at the request of Consumer (10%.

2.12.,2.13. (Modified edition, change No. 2, 3, 5).

2.14. Drawing threads Nocheum pipes are carried out after galvanizing.

2.15. (Excluded, change No. 3).

2.16. Upon the requirement, the weld seams of the pipes are controlled by non-destructive methods.

(Modified edition, change No. 5).

3. Rules of acceptance

3.1. Pipes by accepting points. The party must consist of pipes of the same size, one brand is displaced by one quality document in accordance with GOST10692 with a supplement for pipes intended for the manufacture of detailing and gas pipeline structures, from steel GOST1050.: Chemical composition and mechanical properties of steel in compliance with a document on the quality of the manufacturer's workpiece.

Party mass no more than 60 tons.

(Modified edition, change No. 3, 4).

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

It is allowed to apply store methods for GOST18242 with a normal level. Control plans are established by the co-preparation with the consumer.

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

(Modified edition, change. No. 3, 4, 5).

3.3. To control the 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 beserved edges), mechanical properties take no more than 1%, but at least two pipes from the party, adla Pipes made by the method of continuous oven welding are two pipes of the departments.

(Modified edition, change No. 3, 4).

3.4. Mass culture all pipes.

(Modified edition, change No. 3).

3.5. Each pipe is subjected to trumps. With 100% control of the weld of the weld non-destructive methods, the test of the hydraulomation is allowed not to be carried out. In this case, the ability of pipes with supporting hydraulic pressure is guaranteed.

(Modified edition, change No. 6).

3.6. To check the thickness of the whole coating on the outer surface and in the available places of the internal surface, two pipes are taken from the party.

(Modified edition, change No. 2).

3.7. Upon receipt of the methods of testing results, at least one of the indicators of this is re-testing on a double sample.

The results of repeated tests apply to the entire batch.

4. Test methods

4.1. To control the quality of each selected tube, cut out one specimen for each type.

Tensile testing according to GOST 10006. It is detailed instead of tensile testing to monitor mechanical substitutions by non-destructive methods.

4.2. Inspection of the surface of the pipe produce visually.

4.3. Hydraulic testing is carried out according to GOST 3845 with exposure under test pressure of at least 5 s.

4.4. Test for flexure according to GOST3728. Galvanized pipes are tested before coating.

(Modified edition, change No. 3).

4.4A. Distribution test according to GOST8694 on a conical mandrel with angle of taper ° .

It is allowed to conduct on the mandrel with an angle of tapering 30 ° .

(Modified edition, change No. 3, 4).

4.4b. Sacking test is carried out according to GOST 8695.

(Modified edition, change No. 3).

4.4B. Monitoring welded moving by non-destructive methods according to regulatory and technical documentation.

(Introduced additionally, meas. No. 3).

4.5. The thickness of the zinc coating on the outer surface and in the available places of the internal surface control circulation according to GOST9.301 and GOST9.302, as well as the instruments of the types of MT-41TC, MTZON or the type of "impulse" of the attractive and technical documentation.

4.6. Threads with tested caliber-rings according to GOST 2533 (third grade accuracy).

At the same time, the screw-in-speed caliber rings on the thread should be no more than three revolutions.

(Modified edition, change No. 3, 4).

4.7. The curvature is pipe control of the calibration line according to GOST 8026 and a set of probe-nd.

(Modified edition, change. No. 3, 5).

4.8. A straight corner of the ends pipe control capacity 90 ° 160 size´ 100 mm class 3 GOST 3749, lamellar dialing 4 on ND or GOST 5378. The skosal angle is controlled by a tilt of GOST 5378.

(Modified edition, change. No. 3, 6).

4.9. The control of the outer-hydrameter is carried out by smooth micrometers according to GOST 6507, the chain-brackets according to GOST2216 or GOST 18360.

The thickness of the wall, highlighter graph and the height of burrs are measured by a micrometer according to GOST 6507-90 or a wall-acting according to GOST11358 from both ends of the pipe.

The length of the pipes is measured by rouletteau GOST 7502. Solution is controlled by calibers according to GOST 2533.

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

(Modified edition, change. No. 3, 4, 5, 6).

4.10. CONTROL WELLED SPWAILED NEXT DEVICULATE METHODS ON TECHNICAL DOCUMENTATION.

(Introduced additionally, meas. No. 4).

5. Marking, Packaging, Transportation and Storage

5.1. Marking, packaging, transportation and storage are carried out according to GOST10692 with a supplement.

5.1.1. Carving pipes should be protected from mechanical damage and corrosion with lubrication of attractive technical documentation.

Section. five. (Modified edition, change No. 3).

Information details

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

Developers

V. I. Chrzok, Cand. tehn science V. M. Voron, Cand. tehn science Yu. M. Mironov, Cand. tehn nuk A. I. Postolov

2. Approved by Ivvedhen, the decision of the USSR State Committee on Standardamot 11.09.75 No. 2379

3. Performance check 5 years

4. Instead of GOST3262-62.

5. Reference regulatory and technical documents

	Point 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. Restrictions on the validity period of the decree of the State Standard of 12.11.91 No. 1726

7. Reprint by simulations 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 pipes

Technical conditions

GOST 3262-75

Publishing standards

Moscow

State Standard of the SSR Union

dateadministration 01.01.77

1. Sortiment

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

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

(Modified editors, meas. Number 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 the limit 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
Conditional pass	Outside diameter		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 density of steel equal to 7.85 g / cm 3. Galvanized pipes are heavier than non-scattered by 3%.

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

Table 3.

Dimensions of pipes	Limit deviations for manufacturing accuracy pipes
		increased
Outer diameter with conditional passage:
up to 40 mm.
	- 0,5
Outer diameter with conditional passage: Over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

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 by weight 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 No. 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. Cleaning requirements must comply with the table specified in Table. four.

2.2. At the request of the consumer at the ends of the pipes to be welded, with a wall thickness of 5 mm and more, chamfer must be removed at an angle of 35-40 ° To the trough of the pipe. At the same time, a mechanical ring 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, change No. 3, 4).

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

(Modified edition, change No. 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.

(Modified edition, change No. 3, 4).

(Modified edition, change No. 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 No. 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, change No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

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

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

At the request of the consumer, the pipes must withstand the hydraulic pressure of 4.9 MPa (50 kgf / cm 2)

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 65 and more - at least 4%.

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

2.8, 2.9. (Modified edition, change No. 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, change No. 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%.

2.13. It is allowed on a thread a decrease in the useful thread length (without escape) to 15% compared with the specified B, and at the request of the consumer to 10%.

2.12., 2.13. (Modified edition, change No. 2, 3, 5).

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

2.15. (Excluded, change No. 3).

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

(Modified edition, change No. 5).

3. Rules of acceptance

3.1. Pipes take parties. The party must consist of pipes of one size, one brand 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 GOST 1050.: Chemical composition and mechanical properties of steel in accordance with the document on the quality of the manufacturer's workpiece.

Party mass no more than 60 tons.

(Modified edition, change No. 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.

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. No. 3, 4, 5).

(Modified edition, change No. 3, 4).

3.4. All pipes are monitored.

(Modified edition, change No. 3).

(Modified edition, change No. 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, change No. 2).

3.7. Upon receipt of unsatisfactory test results, at least one of the indicators on it is re-tested 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, change. No. 3, 6).

4.2. Inspection of pipe surfaces produce 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, change No. 3).

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

Testing on a mandrel with angle of taper 30 ° .

(Modified edition, change No. 3, 4).

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

(Modified edition, change No. 3).

Date of introduction 01.01.1977

1. Sortiment

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

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

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

Conditional pass	Outside diameter	Wall thickness			Weight 1 meter, kg
Conditional pass	Outside diameter	lungs	overseas-Venny	strengthened	lungs	overseas-Venny	strengthened
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	1,50	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	3,0	3,5	4,0	3,33	3,84	4,34
50	60	3,0	3,5	4,0	4,22	4,88	6,16
65	75,5	3,2	3,5	4,0	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	4,0	4,5	5	10,85	12,15	13,44
125	140	4,0	4,5	5,5	13,42	15,04	18,24
150	165	4,0	4,5	5,5	15,88	17,81	21,63

table 2

Conditional pass	Outside diameter	Wall thickness	Weight 1 m, kg
10	16	2,0	0,69
15	20	2,5	1,08
20	26	2,5	1,45
25	32	2,8	2,02
32	41	2,8	2,64
40	47	3,0	3,26
50	59	3,0	4,14
65	74	3,2	5,59

For a thread made by the rolling method, it is allowed to reduce its inner diameter to 10% along the entire length of the thread.
The mass of 1 M of pipes is calculated at the density of steel, equal to 7.85 g / cm3. Galvanized pipes are heavier than non-scattered by 3%.

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

Table 3.

The limit deviation in the positive side of the wall thickness is limited by the limit deviations by weight of pipes.
Pipes of ordinary manufacturer accuracy are used for water supply systems, gas pipelines and heating systems. Pipes of increased production accuracy are used for parts of water and gas pipelines.

1.4. Limit deviations by weight 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.

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. Cleaning requirements must comply with the table specified in Table. four.

Table 4.

Conditional pass	The number of threads with conditional passage	The length of the thread before the escape, mm
Conditional pass	The number of threads with conditional passage	long	short
6	-	-	-
8	-	-	-
10	-	-	-
15	14	14	9
20	14	16	10,5
25	11	18	11
32	11	20	13
40	11	22	15
50	11	24	17
65	11	27	19,5
80	11	30	22
90	11	33	26
100	11	36	30
125	11	38	33
150	14	42	36

1.7. Pipes with 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:
Pipe R-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 a thread in the conditional designation after the word "tube" indicates the letter N.
For pipes with long threads in the conditional designation 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

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.

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.

2.3. 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.

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.

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.

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.

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm 2) - Tubes ordinary and light;
3.1 MPa (32 kgf / cm 2) - Pipes reinforced.
At the request of the consumer, the pipes must withstand the hydraulic pressure of 4.9 MPa (50 kgf / cm 2).

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

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.

2.12. 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%.

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%.

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

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

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 manufacturer of the workpiece.

Party mass - no more than 60 tons.

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.

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

3.4. All pipes are monitored.

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.

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 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.

4.4. 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.
4.4-b. Test on flattening is carried out according to GOST 8695.
4.4-c. The control of the weld is carried out by non-destructive methods on the regulatory documentation.

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 the instruments of the types of MT-41TC, MTZON or the type of "impulse" on the regulatory documentation.

4.6. Threads are checked by threaded calibers-rings according to GOST 2533 (third grade of accuracy). In this case, no more than three revolutions should be screwed in the thread.

4.7. The curvature of pipes is controlled by the calibration line according to GOST 8026 and a set of probe on ND.

4.8. The straight angle of the ends of the pipes is controlled by a 90 ° coated with a size of 160,100 mm of class 3 according to GOST 3749, plate-ups for a set of 4 nd or a negotiation according to GOST 5378. The chamfer bevel angle is controlled by a tilt of GOST 5378.

4.9. Control of the outer diameter is carried out by smooth micrometers according to GOST 6507, gauges in accordance with GOST 2216 or GOST 18360.

The wall thickness, the height of the inner graph and the height of the burbs are measured by the micrometer according to GOST 6507 or the wall-acting according to GOST 11358 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 of no more than 10 tons of division of no more than 20 kg.

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

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.

Includes Changes No. 1, 2, 3, 4, 5, 6, approved in January 1987, May 1988, November 1989, November 1991 2-90, 2-92)