Interstate standard
Official edition
Standinform
UDC 669.14-462: 006.354
Group B62.
Water-Supply and Gas-Supply Steel Pipes. Specifications.
ISS 23.040.10 OKP 13 8500, 13 8501
Date of introduction 01.01.77
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 No. 2, 3, 5).
1.1. Pipes are manufactured in size and mass given in Table. one.
At the request of the consumer pipes easy Series, designed to pump thread, are manufactured in size and mass given in Table. 2.
(Modified edition, change No. 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.
Official edition
Reprint is prohibited
© Standards Publishing House, 1976 © Standinform, 2007
Dimensions, mm.
Table 1
|
Pipe wall thickness |
Mass of 1 m pipe, kg |
||||||
Table 2 Dimensions, mm
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 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.
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. Pipe increased accuracy Manufacturers 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 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 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 |
|||
|
short |
short |
||||||
Pipes with conditional passage 6, 8, 10, 15 and 20 mm at the request of the consumer are wounded in 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:
Tube 20x2.8 GOST 3262- 75
The same, with a clutch:
Pipe M-20 x 2.8 GOST 3262- 75 Same, measuring length, threaded:
The pipe R-20X 2.8-4000 GOST 3262-75 is the same, with a zinc coating, neotoral length, with thread:
Pipe C-P-20X 2.8 GOST 3262-75 Same, with zinc coating, measuring length, threaded:
Pipe C-P-20X 2,8-4000 GOST3262-75
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", the letter D. For pipes of increased production accuracy in the conditional designation after the size of the conditional pass is indicated by the letter P.
(Modified edition, change No. 1).
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.
2.3. 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, 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.
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, change No. 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 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) - 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).
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 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%.
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%.
2.14. 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.
(Modified edition, change No. 5).
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; chemical composition And the 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, 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).
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, change No. 3, 4).
3.4. All pipes are monitored.
(Modified edition, change No. 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, 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 holds repeated tests on a double sample.
Results of repeated tests apply to the entire batch.
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. Hydraulic test Conducted according to GOST 3845 with an excerpt 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 an angle of tapering 6 °.
Testing on a mandrel with an angle of tapered 30 ° is allowed.
(Modified edition, change No. 3, 4).
In the territory Russian Federation GOST R 50779.71-99 is valid.
4.46. Test on flattening is carried out according to GOST 8695.
(Modified edition, change No. 3).
4.4B. The control of the weld is carried out by non-destructive methods on the regulatory 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 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.
(Modified edition, change No. 3, 4).
4.7. The curvature of pipes is controlled by the calibration line according to GOST 8026 and a set of probe on the ID.
(Modified edition, change. No. 3, 5).
4.8. The direct angle of the ends of the pipes is controlled by a 90 ° coal with a size of 160 x 100 mm of class 3 according to GOST 3749, plate-ups for the ID of the ID or an oppositeer according to GOST 5378. The chamfer bevel angle is controlled by a tilter according to GOST 5378.
(Modified edition, change. No. 3, 6).
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.
Monitoring the mass of the batch of pipes is carried out on the scales no more than the price of division of no more than 20 kg.
(Modified edition, change. No. 3, 4, 5, 6).
4.10. The control of the weld is carried out by non-destructive methods for technical documentation.
(Introduced additionally, meas. No. 4).
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, change No. 3).
IN AND. Chips, Cand. tehn sciences; V.M. Crow, Cand. tehn sciences; Yu.M. Mironov, Cand. tehn sciences; A.I. Postolov
|
Point number |
Point number |
||
|
GOST 9.301-86 |
GOST 7502-98. | ||
|
GOST 9.302-88 |
GOST 8026-92. | ||
|
GOST 9.307-89 |
GOST 8694-75 | ||
|
GOST 8695-75 | |||
|
GOST 1050-88 |
GOST 8944-75 | ||
|
GOST 2216-84 |
GOST 8954-75 | ||
|
GOST 2533-88 |
GOST 8965-75 | ||
|
GOST 3728-78 |
GOST 8966-75 | ||
|
GOST 3749-77 |
GOST 10006-80 | ||
|
GOST 3845-75 |
GOST 10692-80 | ||
|
GOST 5378-88 |
GOST 11358-89 | ||
|
GOST 6357-81 |
GOST 18242-72. | ||
|
GOST 6507-90. |
GOST 18360-93 |
7. Edition (May 2007) with amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989 , November 1991 (Nus 1-78, 2-79, 4-87, 8-88, 2-90, 2-92)
Editor L. I. Nakhimova Technical editor O.N. Vlasova Corrector A. S. Cherniusova Computer Layout I.A. Tyclina
Rent in the set 14.05.2007. Signed in print 05.06.2007. Format 60 x 84 VS- Paper offset. Guard Times. Print offset. Hood. Pechs. l. 0.93. Ud. l. 0.80. Circulation 126 copies. Zack. 421. Since 4031.
FSUE "Standinform", 123995 Moscow, grenade lane, 4. Write in FSUE "Starotinform" on the PEVM
Printed in the branch of FSUE "Standinform" - type. Moscow Provider, 105062 Moscow, Lyalin Per., 6
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.
There are several options for the length of products:
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.
The water and gas pipeline will be made of steel for a long time. Alternative options - 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.
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. On the picture - gas pipeline.
Benefits:
Disadvantages:
Dimensions and possible deviations are regulated by GOST 3262-75.
As it is about water pipesInstead of the size of the inner diameter, this indicator is used as a conditional passage. It is given both in inches and in mm.
Different way Styling pipeline I. different conditions operation suggest excellent from each other specifications. Rental produces several modifications.
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:
In fact, both types of water-water pipes are made of steel, but there are different levels of control. As a result, get:
Trumpet water and gas pipes GOST 3262-75 produced:
The wall thickness of the waterproofing determines the strength and resistance to a certain hydraulic pressure. Classification is as follows:
Technical conditions
Water-Supply and Gas-Supply Specifications
Date of administration: 01.01.77
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.
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 dump threads, are manufactured in size and mass given in Table 2.
1.2. The length of the pipe is made from 4 to 12 m:
a) a dimensional or multiple dimensional length with an allowance for each cut 5 mm and a limit deviation for the entire length plus 10 mm;
b) neotoral 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 | Pipe wall thickness | Mass of 1 m pipe, kg | ||||
|---|---|---|---|---|---|---|---|
| lungs | ordinary | reinforced | lungs | ordinary | reinforced | ||
| 6 | 10,2 | 1,8 | 2,0 | 2,5 | 0,37 | 0,40 | 0,47 |
| 8 | 13,5 | 2,0 | 2,2 | 2,8 | 0,57 | 0,61 | 0,74 |
| 10 | 17,0 | 2,0 | 2,2 | 2,8 | 0,74 | 0,80 | 0,98 |
| 15 | 21,3 | 2,35 | - | - | 1,10 | - | - |
| 15 | 21,3 | 2,5 | 2,8 | 3,2 | 1,16 | 1,28 | 1,43 |
| 20 | 26,8 | 2,35 | - | - | 1,42 | - | - |
| 20 | 26,8 | 2,5 | 2,8 | 3,2 | 1,5 | 1,66 | 1,86 |
| 25 | 33,5 | 2,8 | 3,2 | 4,0 | 2,12 | 2,39 | 2,91 |
| 32 | 42,3 | 2,8 | 3,2 | 4,0 | 2,73 | 3,09 | 3,78 |
| 40 | 48,0 | 3,0 | 3,5 | 4,0 | 3,33 | 3,84 | 4,34 |
| 50 | 60,0 | 3,0 | 3,5 | 4,5 | 4,22 | 4,88 | 6,16 |
| 65 | 75,5 | 3,2 | 4,0 | 4,5 | 5,71 | 7,05 | 7,88 |
| 80 | 88,5 | 3,5 | 4,0 | 4,5 | 7,34 | 8,34 | 9,32 |
| 90 | 101,3 | 3,5 | 4,0 | 4,5 | 8,44 | 9,60 | 10,74 |
| 100 | 114,0 | 4,0 | 4,5 | 5,0 | 10,85 | 12,15 | 13,44 |
| 125 | 140,0 | 4,0 | 4,5 | 5,5 | 13,42 | 15,04 | 18,24 |
| 150 | 165,0 | 4,0 | 4,5 | 5,5 | 15,88 | 17,81 | 21,63 |
table 2
Notes:
1. For 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%.
(Modified editors, change No. 1, 3)
1.3. Limit deviations in the size of pipes should not exceed the specified in Table. 3.
Table 3.
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 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.
Table 4.
| Conditional passage, mm | The number of threads with conditional passage | The length of the thread before the escape, mm | |
|---|---|---|---|
| long | short | ||
| 6 | - | - | - |
| 8 | - | - | - |
| 10 | - | - | - |
| 15 | 14 | 14 | 9,0 |
| 20 | 14 | 16 | 10,5 |
| 25 | 11 | 18 | 11,0 |
| 32 | 11 | 20 | 13,0 |
| 40 | 11 | 22 | 15,0 |
| 50 | 11 | 24 | 17,0 |
| 65 | 11 | 27 | 19,5 |
| 80 | 11 | 30 | 22,0 |
| 90 | 11 | 33 | 26,0 |
| 100 | 11 | 36 | 30,0 |
| 125 | 11 | 38 | 33,0 |
| 150 | 11 | 42 | 36,0 |
1.7. Pipes with a conditional passage of 6, 8, 10, 15 and 20 mm at the request of the consumer are wound into rebellion.
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 20 × 2.8 GOST 3262-75
The same, with a clutch:
Pipe M-20 × 2.8 GOST 3262-75
The same, measuring length, with carvings:
Pipe r-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-R-20 × 2.8 - 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
(Modified edition, change No. 1).
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 made of steels of software.
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 should be removed at an angle of 35-40 ° to the tube's end. 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 by software, and 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.
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, change No. 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 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.
(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)
(Modified edition, change No. 2, 3, 5).
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 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.
(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 match.
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, 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%.
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%.
(Modified edition, change No. 2, 3, 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%.
(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).
3.1. Pipes take parties. The party must consist of pipes of one size, one brand 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 by: chemical composition and mechanical properties of steel in accordance with the document quality document - Preceiver the 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 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. No. 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, change No. 3, 4).
3.4. All pipes are monitored.
(Modified edition, change No. 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, 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.
4.1. To control the quality from each selected tube, one sample is cut for each type of test.
Tensile test is carried out by. It is allowed instead of tensile test to monitor mechanical properties by non-destructive methods.
4.2. Inspection of pipe surfaces produce 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 by software. Galvanized pipes are tested before coating.
(Modified edition, change No. 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, change No. 3, 4).
4.4b. Filming test is carried out by.
(Modified edition, change No. 3).
4.4B. The control of the weld is carried out 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 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 and technical 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, change No. 3, 4).
4.7. The curvature of pipes is controlled by the calibration line of the software and a set of probes on TU 2-034-225-87.
(Modified edition, change. No. 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, plate-panels of a set of 4 TU 2-034-225-87 or a tilter. The bevel of the chamfer is controlled by a coupler by.
(Modified edition, change. No. 3, 6).
4.9. Control of outer diameter is carried out by smooth micrometers of software, caliber-brackets for or.
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 tape measure. Threads are controlled by calibers.
Pipes Category VGP are a group of water-wire pipes made of steel. Moreover, there are galvanized and non-dissolved options. Pipes hollow, cylindrical formhaving longitudinal weld.
The category has three versions of wall thickness - thick-walled, medium and thin-walled. An assortment of this nature makes it possible to use pipes that are suitable for this project in which they are used.
The name speaks for itself - the pipe of this type can be used as in plumbing systemsand in highways conducted gas. In principle, VGP tube is considered a universal option for many applications.
Standard pipes have a length of segments from 4 m to 12 m. Moreover, it is possible to select the material - without thread, or with cylindrical or rolled threads at the ends. Moreover, it may be short or long - it all depends on the nuances to use.
Usually the PPP tube has three strength categories:
At least such pipes are heavier than those of the non-scattered, about 3%, the coating gives an excellent result when passing the liquids on the highway. The pipe does not rust, and its service life is extended at times.
Advantages of pipes VGP
- Standard Pipes VGP GOST 3262 75 are made of high quality steel.
- The so-called "black pipes" VGP have reinforced welded seams.
- The pipes of this type have three convenient categories for consumer - light, reinforced and ordinary. This allows you to select the desired option for the ideal line of the highway.
- The thread at the ends of the pipes can be long, short, or applied depending on the wishes of the customer on the desired side in the desired parameters.
- Suppliers of this category or with couplings, or without them.
- Pipe parameters can be indicated in inches, which is considered the norm.
- The implemented pipes undergo mandatory hydrocarcy control, therefore compliance with the norms can be considered almost perfect.
- Low cost with excellent quality products - Garant of assigned standards and standards.
- Universality in application. The pipes of the desired type are ideal for assembly and repair work almost any category.
- A huge range of pipe varieties - from hot-rolled seamless, to cold-rolled and electrical welded options.
- The presence of component elements - flanges, couplings, tees, taps, transitions, and other things, as well as the possibility of their easy use in assembly work.
As you understood, standard VGPs of GOST 3262 75 pipes have a wide range of applications. The presence of at least three types of this species makes it possible to apply them in almost all regions of pipelines. Moreover, it is possible to choose a category for a highway, with a rich selection of type of pipes for its installation.
