GOST 3262 75 applies to galvanized and non-galvanized welded steel pipes without threads and with rolled or cut cylindrical threads. The scope of their application is water and gas pipelines, heating systems, as well as the production of parts for water and gas supply structures.
Welded steel pipes are used for the installation of water and gas pipelines
In accordance with the requirements of this regulatory document pipes are manufactured according to the weight and dimensions indicated in table 1. The unit of measurement for geometric dimensions is millimeters.
Table 1
When calculating the mass of 1 meter of products, the value of steel density equal to 7.85 g / cm³ was taken as a basis. Non-galvanized pipes are 3% lighter than galvanized water and gas pipes GOST 3262 75.
Maximum deviation by weight at the request of the customer should not exceed:
The production of steel pipes for water and gas supply of the above assortment in accordance with GOST 3262 75 is carried out from steels in accordance with GOST 1050 and GOST 380 without standardization chemical composition and mechanical properties. Pipes for parts of gas and water supply structures are produced in accordance with GOST 1050.
The length of steel water and gas pipes GOST 3262 75 is produced in the range of 4m≤L≤12m.
Steel pipes are available in measured and unmeasured lengths.
If this parameter is used as a criterion, these products are:
All tolerances are strictly regulated by GOST and in the presence of deviations exceeding the permissible ones, the product is considered a marriage.
Important! If the thread is made by knurling, the reduction of the inner diameter of the steel water and gas pipe GOST 3262 75 is allowed by no more than 10 percent along the length of the thread.
The range of maximum deviations of pipe sizes is indicated in table 2.
table 2
The "Pipe curvature" indicator per 1 meter of length in accordance with GOST 3262 75 does not exceed:
One of the most significant technical characteristics of the GOST 3262 75 water and gas pipe is pressure resistance. Depending on the type, a product of this type can withstand:
The thickness of the zinc coating over the entire surface of pipes of this assortment must be at least 30 microns. Its absence is allowed on the threads and ends of the products. The galvanized surface should not have inclusions (sintered mixture, oxides, hartzinc), blistering and signs of flaking of the coating from the steel base.
Insignificant influx of zinc in some places and roughness, traces of capture of products by lifting equipment and local flux spots are allowed.
Separate sections of a galvanized steel water-gas pipe GOST 3262 75 can be corrected if there is no zinc coating on them by no more than 0.5% of the total surface area. This operation must be carried out in accordance with the requirements of GOST 9.307.
If the nominal bore does not exceed 40 millimeters, the galvanized pipe must withstand a bend test conducted around the mandrel, the diameter of which is 2.5 * Dvn, where Dvn. Is the outer diameter of the test piece.
Expansion test of steel pipes is carried out using tapered mandrels
In addition to this method, there is a more stringent technology for checking the technical characteristics of pipes. It is called the "Expansion test", it is expressed as a percentage and determines the ability of the pipe to expand until cracks appear, when a cone-shaped body moves in its hole. With a conditional passage of 15 ... 50 millimeters, the value of this indicator should be at least 7 percent. For pipes, the nominal size of which exceeds 65 millimeters - at least 4 percent.
Helpful information! The above test methods are especially relevant for galvanized water and gas pipes GOST 3262 75. After all, the destruction of the coating layer will deprive the product of many attractive technical characteristics for which the consumer buys not just steel, but galvanized water pipes.
Galvanized pipes manufactured in accordance with the requirements of GOST 3262-75 are a guarantee of the reliability and durability of the pipeline for any purpose.
GOST 3262 75: welded steel water and gas pipes
GOST 3262 75 steel water and gas pipes. Assortment of products. Specifications pipes in accordance with GOST 3262 75. Requirements. Test methods.
This group includes non-galvanized and galvanized welded steel pipes used for water and gas pipelines, as well as for heating systems and structural parts. By lenght water and gas pipes made from 4 to 12 m:
a) measured or multiple measured lengths with an allowance for each cut of 5 mm and a longitudinal deviation for the entire length plus 10 mm,
b) unmeasured length.
By agreement between the manufacturer and the consumer in a batch of unmeasured water and gas pipes up to 5% of pipes with a length of 1.5 to 4 m are allowed.
For a thread made by the knurling method, on a pipe it is allowed to reduce its inner diameter by up to 10% along the entire length of the thread. Weight 1 m water and gas pipe calculated with a density of steel equal to 7.85 g / cm. Galvanized water and gas pipes heavier than non-galvanized by 3%.
Note: Maximum deviation to the plus side along the wall thickness is limited by maximum deviations in mass water and gas pipes... Water and gas pipes of normal manufacturing accuracy are used for water supply, gas pipelines and heating systems.
Water and gas pipes increased accuracy manufacture is used for parts of water and gas pipelines.
Maximum deviations in pipe weight should not exceed + 8%. At the request of the consumer, the maximum deviations in weight should not exceed: + 7.5% - for a batch, + 10% - for a separate pipe.
The curvature of water and gas pipes per 1 m of length should not exceed: 2 mm - with a nominal bore up to 20 mm inclusive, 1.5 mm - with a nominal bore over 20 mm.
Water and gas pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the request of the consumer. Examples of symbols:
Ordinary pipe, non-galvanized, of normal manufacturing accuracy, off-gauge length, with a nominal bore of 20 mm, wall thickness of 2.8 mm, without thread and without coupling: pipe 20 × 2.8 GOST 3262-75.
The same, with the coupling: pipe М-20х2,8 GOST 3262-75.
The same, measured length, with thread: pipe R-20x2, 8-4000 GOST 3262-75.
For water and gas pipes for thread rolling, the letter H is indicated in the symbol after the word “pipe”.
For water and gas pipes with a long thread, the letter D. is indicated in the symbol after the word “pipe”.
For water and gas pipes of increased manufacturing accuracy, the letter P. is indicated in the symbol after the size of the conditional passage.
Water and gas pipes
Water and gas pipes Steel water and gas pipes (GOST 3262-75) This group includes non-galvanized and galvanized welded steel pipes used for water supply and
Galvanized VGP pipe in accordance with GOST 3262-75- This is a fairly well-known and popular type of pipe-rolling, which has a zinc coating, which gives the product a decent anti-corrosion strength.
VGP pipes are manufactured in accordance with GOST 3262-75 from steel of the highest quality. The average length of the products is 4-13 meters. At the request of the customer, it can be created more than the specified length.
Galvanized steel VGP pipe Is a high-precision pipe-rolling product, which is mainly used as gas and water supply structures.
GOST 3262-75 establishes technical requirements and standards according to which rolled steel pipes are manufactured. But each standard provides for possible deviations from the norms. For example, the possible maximum deviation by weight cannot exceed 8%.
The assortment of galvanized-coated water and gas steel pipes is divided into 2 categories.
Variety of lengths of VGP pipes
Unmeasured length with coupling.
Advantages of galvanized VGP pipes in accordance with GOST 3262-75:
These products significantly exceed the strength of metal products, and when compared with carbon metal pipes, they have high resistance to corrosion.
The specialists of the company "Metal-Service" confidently guarantee the highest quality and durability of this pipe-rolling.
Galvanized VGP pipe in accordance with GOST 3262-75 is coated in two ways. At hot-dip galvanized pipe-rolling is dipped into a zinc melt, after which it is allowed to cool, as a result of which a film is formed. At electrochemical galvanized zinc solution is used. But the disadvantage of this method is that the toxic electrolyte used in this method needs to be destroyed.
According to this standard, products are produced in lengths of 4-13 meters and an outer diameter of 10.2-166 mm. At the request of the customer, pipes can be up to 20 mm in diameter and of the required length.
The method is selected taking into account the wall thickness of the products. Products with a thickness of 5 mm or more are suitable for welding.
Light and ordinary galvanized VGP pipes are used in areas with a pressure of 2.4 MPa, reinforced - 3.1 MPa.
The entire surface of the products is covered with a zinc coating with a thickness of at least 30 microns. He may be absent at the end. Allowed "influx" of zinc in some places, roughness, as well as traces of lifting equipment.
The manufactured products are checked by various methods.
In the case when the product has a nominal bore of not more than 40 mm, then it can withstand bending test (hot dipping method) passing around a mandrel with an outer diameter of 2.5 mm.
There is an even more serious test - this dispensing test (immersion method), which is expressed as a percentage. It can be used to determine how much the pipe has the ability to expand before cracking occurs. With a nominal bore of 15-50 mm, the value of this indicator is usually more than 7%, and with a bore of more than 65 mm - less than 4%.
“The described methods are suitable only for galvanized HDPE pipes in accordance with GOST 3262-75. After all, the destruction of the galvanized layer of the pipe coating will deprive it of many quality characteristics. "
All VGP pipes are manufactured according to the GOST standard. This table presents fixed dimensions for the production of water and gas products. Each manufacturer focuses on them.
Now let's find out where this rolled metal is used.
Galvanized VGP pipe in accordance with GOST 3262-75 used for laying internal communications in residential and industrial facilities, as well as their heating.
Such products are in demand in the aviation, shipbuilding industry, as well as in civil engineering.
Galvanized products, including VGP pipes according to GOST 3262-75 will be popular for many years to come. This is due to the fact that the metal has qualities such as:
Compared with other types of pipe rolling, galvanized VGP pipe according to GOST 3262-75 has great advantage... The product is absolutely not exposed to the appearance of rust, and its walls are smooth. By quality characteristics, the product has high mechanical properties. It cannot be accidentally damaged. Moreover, the product can be used in any weather conditions as it is heat-resistant. For this type, the method of welding or threaded connection is usually used.
But the installation of galvanized VGP pipes in accordance with GOST 3262-75 must be performed by a specialist. Knowledge and experience are required to obtain a leak-free connection.
"Metal-Service" offers to buy high quality galvanized VGP pipes from trusted suppliers. We guarantee that all products will fully comply with the established GOST standards.
Our employees are distinguished by their special professionalism. Therefore, if you have any questions about metal rolling - Call us! The managers of the company will be happy to tell you what a galvanized VGP pipe is in accordance with GOST 3262 75 and where it is used.
Galvanized VGP pipe in accordance with GOST 3262-75
Technical requirements for galvanized VGP pipes in accordance with GOST 3262-75. Test methods and methods for galvanizing VGP pipes.
Water-supply and gas-supply steel pipes. Specifications
GOST 3262-75
OKP 13 8500, OKP 13 8501
Date of introduction 01.01.77
This standard applies to non-galvanized and galvanized steel welded pipes with threaded or rolled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of plumbing and gas pipelines.
(Modified edition, Amendments No. 2, 3, 5).
1.1. Pipes are manufactured according to the dimensions and weight given in table. one.
At the request of the consumer pipes light series intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.
(Modified edition, Amendments No. 1, 3).
1.2. The length of the pipe is made from 4 to 12 m:
measured or multiple measured lengths with an allowance for each cut of 5 mm and a longitudinal deviation for the entire length plus 10 mm;
unmeasured length.
By agreement between the manufacturer and the consumer, in a batch of off-gauge pipes, up to 5% of pipes with a length of 1.5 to 4 m are allowed.
Table 1
Table 2
NOTE:
1. For a thread made by the knurling method, on a pipe it is allowed to reduce its inner diameter up to 10% along the entire length of the thread.
2. The mass of 1 m of pipes is calculated at a density of steel equal to 7.85 g / cm 3. Galvanized pipes are heavier than non-galvanized ones by 3%.
1.3. Limit deviations in pipe dimensions should not exceed those indicated in table. 3.
Table 3
NOTE:
1. The maximum deviation to the plus side in the wall thickness is limited by the maximum deviations in the mass of the pipes.
2. Pipes of normal manufacturing accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water supply and gas supply structures.
1.4. Maximum deviations in pipe weight should not exceed +8%.
At the request of the consumer, the maximum deviations in weight should not exceed:
7.5% - for the party;
10% - for a separate pipe.
(Changed edition, Amendments No. 2, 5).
1.5. The curvature of pipes for 1 m of length should not exceed:
2 mm - with nominal bore up to 20 mm inclusive;
1.5 mm - with a nominal bore over 20 mm.
1.6. The pipe threads can be long or short. The requirements for the thread must correspond to those indicated in table. 4.
Table 4
1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are coiled at the request of the consumer.
EXAMPLES OF EQUIPMENT
Ordinary pipe, non-galvanized, of normal manufacturing accuracy, off-gauge length, with a nominal bore of 20 mm, wall thickness of 2.8 mm, without thread and without coupling:
Pipe 20 -2.8 TOAST 3262-75
The same with the clutch:
Pipe M-20 -2.8 TOST 3262-75
The same, measured length, with thread:
Pipe R-20 2.8-4000 TOST 3262-75
The same, with zinc coating, unmeasured length, with thread:
Pipe Ts-R-20 -2.8 TOST 3262-75
The same, with a zinc coating, measured length, with a thread:
Pipe Ts-R-20 -2.8-4000 TOST 3262-75
For pipes for thread rolling, the letter H is indicated in the symbol after the word "pipe".
For pipes with a long thread, the letter D. is indicated in the symbol after the word "pipe".
For pipes of increased manufacturing accuracy, the letter P. is indicated in the symbol after the size of the nominal bore.
(Modified edition, Amendment No. 1).
2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations, approved in the prescribed manner, from steels in accordance with GOST 380 and GOST 1050 without standardizing the mechanical properties and chemical composition.
Pipes for parts of water supply and gas supply structures are made of steel in accordance with GOST 1050.
2.2. At the request of the consumer, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35–40 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left.
At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.
2.3. At the request of the consumer, pipes are equipped with couplings made in accordance with GOST 8944, GOST 8954, GOST 8965 and GOST 8966, at the rate of one coupling for each pipe.
(Modified edition, Amendment No. 3).
2.4. Cracks, captivity, swelling and sunsets are not allowed on the pipe surface.
No delamination is allowed at the ends of the pipes.
Separate dents, ripples, risks, traces of cleaning and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.
On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam, if there is a shallow thickening in this place of not more than 1.0 mm along the inner diameter.
(Modified edition, Amendments No. 3, 4).
2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, on the inner surface of the pipe seam, the burr must be cut or flattened, while the burr height or, therefore, must exceed 0.5 mm.
At the request of the consumer, on pipes with a nominal bore of more than 15 mm, made by furnace welding and by the method of hot reduction, a gentle thickening with a height of no more than 0.5 mm is allowed on the inner surface of the pipes in the seam zone.
(Modified edition, Amendments No. 2, 3, 4, 5, 6).
2.6. The ends of the pipes must be cut at right angles. The size of the bevel of the butt face is allowed more than 2 °. Burr residues should not exceed 0.5 mm. When removing burrs, the formation of bluntness (rounding) of the ends is allowed. Cutting of pipes in the mill line is allowed.
By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6–25 mm, made by furnace welding.
(Modified edition, Amendments No. 4, 6).
2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of the pipes is allowed.
On the surface of galvanized pipes, blistering and foreign inclusions (hard zinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.
Separate flux spots and traces of pipe gripping by lifting devices, roughness and slight local influx of zinc are allowed.
It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307.
(Modified edition, Amendments No. 3, 4).
2.8. The pipes must be able to withstand hydraulic pressure:
2.4 MPa (25 kgf / cm 2) - ordinary and light pipes;
3.1 MPa (32 kgf / cm 2) - reinforced pipes.
At the request of the consumer, the pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2).
2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 of the outer diameter, and with a nominal bore of 50 mm, on a mandrel with a radius equal to 3.5 of the outer diameter.
At the request of the consumer, pipes must withstand the expansion test:
for pipes with a nominal bore from 15 to 50 mm - at least 7%;
for pipes with a nominal bore of 65 mm and more - at least 4%.
At the request of the consumer, pipes must withstand the flattening test up to a distance between flattened surfaces equal to 2/3 of the outer diameter of the pipes.
2.10. At the request of the consumer, the mechanical properties of pipes for parts of water and gas supply structures must comply with GOST 1050.
2.11. The pipe thread must be clean, without flaws and burrs and comply with GOST 6357, accuracy class B.
Pipes with cylindrical threads are used for assembly with seals.
2.12. In the place of the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.
Threads with stripped (for cut) or incomplete (for rolled) threads are allowed on the thread, provided that their total length does not exceed 10% of the required thread length, and does not exceed 5% at the consumer's demand.
2.13. Allowed on the thread to reduce the useful length of the thread (without runaway) up to 15% compared to that indicated in table. 4, and at the request of the consumer - up to 10%.
2.14. Threading on galvanized pipes is carried out after galvanizing.
2.15. (Deleted, Amendment No. 3).
2.16. At the request of the consumer, pipe welds are subjected to non-destructive testing.
(Modified edition, Amendment No. 5).
3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, one grade of steel and be accompanied by one document of quality in accordance with GOST 10692 with an addition for pipes intended for the manufacture of parts of water supply and gas pipeline structures, made of steel in accordance with GOST 1050; chemical composition and mechanical properties of steel - in accordance with the quality document of the manufacturer of the workpiece.
Lot weight - no more than 60 tons.
(Modified edition, Amendments No. 3, 4).
3.2. The surface, dimensions and curvature are checked for each pipe in the batch.
It is allowed to apply statistical control methods in accordance with GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and 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, Amendments No. 3, 4, 5).
3.3. To control the parameters of the thread, for testing for expansion, flattening, bending, the height of the inner burr, the remnants of burrs, the right angle and the bevel angle (for pipes with beveled edges), mechanical properties, take no more than 1%, but not less than two pipes from the batch, and for pipes made by continuous furnace welding - two pipes per batch.
(Modified edition, Amendments No. 3, 4).
3.4. All pipes are subject to weight control.
(Modified edition, Amendment No. 3).
3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the welded seam by non-destructive methods, it is allowed not to carry out a hydraulic pressure test. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.
(Modified edition, Amendment No. 6).
3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the batch.
(Modified edition, Amendment No. 2).
3.7. Upon receipt of unsatisfactory test results for at least one of the indicators for it, repeated tests are carried out on a doubled sample.
Retest results apply to the entire batch.
4.1. For quality control, one sample is cut from each selected pipe for each type of test.
Tensile testing is carried out in accordance with GOST 10006. Instead of tensile testing, it is allowed to carry out control of mechanical properties by non-destructive methods.
4.2. Inspection of the pipe surface is carried out visually.
4.3. Hydraulic test carried out in accordance with GOST 3845 with holding under test pressure for at least 5 s.
4.4. The bend test is carried out in accordance with GOST 3728. Galvanized pipes are tested before coating.
(Modified edition, Amendment No. 3).
4.4a. The expansion test is carried out in accordance with GOST 8694 on a tapered mandrel with a taper angle of 6 °.
Testing on a mandrel with a taper angle of 30 ° is allowed.
(Modified edition, Amendments No. 3, 4).
4.46. Flattening test is carried out according to GOST 8695.
(Modified edition, Amendment No. 3).
4.4c. The control of the welded seam is carried out by non-destructive methods in accordance with the normative documentation.
(Introduced additionally, Amendment No. 3).
4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301 and GOST 9.302, as well as with devices of the MT-41NTs, MTZON type or the "Impulse" type according to regulatory documents.
4.6. The thread is checked with threaded ring gauges in accordance with GOST 2533 (third class of accuracy).
In this case, the screwing capacity of the no-through ring gauge on the thread should be no more than three turns.
(Modified edition, Amendments No. 3, 4).
4.7. The curvature of the pipes is controlled with a straight edge in accordance with GOST 8026 and a set of probes in accordance with ND.
(Modified edition, Amendments No. 3, 5).
4.8. The right angle of the pipe ends is controlled with a 90 ° square with a size of 160-100 mm of class 3 according to GOST 3749, plate probes set 4 according to ND or a goniometer according to GOST 5378. The bevel angle is controlled by a goniometer according to GOST 5378.
(Modified edition, Amendments No. 3, 6).
4.9. Outside diameter control is carried out with smooth micrometers in accordance with GOST 6507, with staple calibers in accordance with GOST 2216 or GOST 18360.
The wall thickness, the height of the inner burr and the height of the burrs are measured with a micrometer in accordance with GOST 6507 or a wall gauge in accordance with GOST 11358 from both ends of the pipe.
The length of the pipes is measured with a tape measure in accordance with GOST 7502. The thread is controlled with gauges in accordance with GOST 2533.
The control of the mass of a batch of pipes is carried out on a scale of no more than 10 tons with a graduation price of no more than 20 kg.
(Changed edition, Amendments No. 3, 4, 5, 6).
4.10. The control of the welded seam is carried out by non-destructive methods according to the technical documentation.
(Introduced additionally, Amendment No. 4).
5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with the addition.
5.1.1. The pipe threads must be protected against mechanical damage and corrosion by grease according to the normative documentation.
Sec. 5. (Modified edition, Amendment No. 3).
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
V. I. Struzhok, Cand. tech. sciences; V. M. Vorona, Cand. tech. sciences; Yu.M. Mironov, Cand. tech. sciences; A. I. Postolova
2. APPROVED AND INTRODUCED BY Decree State Committee USSR according to the standards of 09/11/75 No. 2379
3. Inspection frequency - 5 years
4. REPLACE GOST 3262-62
5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS
6. The limitation of the validity period was lifted by the Resolution of the State Standard of 12.11.91 No. 1726
7. EDITION with Amendments No. 1, 2, 3, 4, 5, 6, approved January 1987, May 1988, November 1989, November 1991 2-90, 2-92)
In the territory Russian Federation GOST R 50779.71-99 is in effect.
PUBLISHING STANDARDS
STATE STANDARD OF THE UNION OF SSR
Date of introduction 01.01.77
This standard applies to non-galvanized and galvanized steel welded pipes with threaded or rolled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of plumbing and gas pipelines.
1. VARIETY
1.1. Pipes are manufactured according to the dimensions and weight given in table. one.
At the request of the consumer, pipes of a light series intended for thread rolling are made according to the dimensions and weight given in table. 2.
1.2. The length of the pipe is made from 4 to 12 m:
a) measured or multiple measured lengths with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;
b) unmeasured length.
By agreement between the manufacturer and the consumer, in a batch of off-gauge pipes, up to 5% of pipes with a length of 1.5 to 4 m are allowed.
Table 1
|
Conditional pass |
Outside diameter |
Pipe wall thickness |
Weight of 1 m pipes, kg |
||||
|
lungs |
com. |
reinforced |
lungs |
com. |
reinforced |
||
|
10,2 |
0,37 |
0,40 |
0,47 |
||||
|
13,5 |
0,57 |
0,61 |
0,74 |
||||
|
17,0 |
0,74 |
0,80 |
0,98 |
||||
|
21,3 |
2,35 |
1,10 | |||||
|
21,3 |
1,16 |
1,28 |
1,43 |
||||
|
26,8 |
2,35 |
1,42 | |||||
|
26,8 |
1,66 |
1,86 |
|||||
|
33,5 |
2,12 |
2,39 |
2,91 |
||||
|
42,3 |
2,73 |
3,09 |
3,78 |
||||
|
48,0 |
3,33 |
3,84 |
4,34 |
||||
|
60,0 |
4,22 |
4,88 |
6,16 |
||||
|
75,5 |
5,71 |
7,05 |
7,88 |
||||
|
88,5 |
7,34 |
8,34 |
9,32 |
||||
|
101,3 |
8,44 |
9,60 |
10,74 |
||||
|
114,0 |
10,85 |
12,15 |
13,44 |
||||
|
140,0 |
13,42 |
15,04 |
18,24 |
||||
|
165,0 |
15,88 |
17,81 |
21,63 |
||||
table 2
|
Conditional pass |
Outside diameter |
Wall thickness |
Weight of 1 m pipes, kg |
|
0,69 |
|||
|
1,08 |
|||
|
1,45 |
|||
|
2,02 |
|||
|
2,64 |
|||
|
3,26 |
|||
|
4,14 |
|||
|
5,59 |
Notes:
1. For a thread made by the knurling method, on a pipe it is allowed to reduce its inner diameter by up to 10% along the entire length of the thread.
2. The mass of 1 m of pipes is calculated at a density of steel equal to 7.85 g / cm 3. Galvanized pipes are heavier than non-galvanized ones by 3%.
(Modified edition, Amendments No. 1, 3)
1.3. Limit deviations in pipe dimensions should not exceed those indicated in table. 3.
Table 3
|
Pipe dimensions |
Limit deviations for pipes of manufacturing accuracy |
|
|
the usual |
increased |
|
|
Outside diameter with nominal bore: | ||
|
up to 40 mm incl. |
0.4 mm |
0.4 mm |
|
0.5 mm |
0.4 mm |
|
|
Over 40 mm |
0,8 % |
0,8 % |
|
1,0 % |
0,8 % |
|
|
Wall thickness |
15 % |
10 % |
Notes:
1. The maximum deviation to the plus side in the wall thickness is limited by the maximum deviations in the mass of the pipes.
2. Pipes of normal manufacturing accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water supply and gas supply structures.
1.4. Maximum deviations in pipe weight should not exceed + 8%.
At the request of the consumer, the maximum deviations in weight should not exceed:
7.5% - for the party;
10% - for a separate pipe.
(Changed edition, Amendments No. 2, 5).
1.5. The curvature of pipes for 1 m of length should not exceed:
2 mm - with nominal bore up to 20 mm inclusive;
1.5 mm - with a nominal bore over 20 mm.
1.6. The pipe threads can be long or short. The requirements for the thread must correspond to those indicated in table. 4.
Table 4
|
Nominal bore, mm |
Thread length before running away |
Nominal bore, mm |
Number of threads at conditional passage |
Thread length before running away |
|||
|
long |
short |
long |
short |
||||
|
17,0 |
|||||||
|
19,5 |
|||||||
|
22,0 |
|||||||
|
26,0 |
|||||||
|
10,5 |
30,0 |
||||||
|
11,0 |
33,0 |
||||||
|
13,0 |
36,0 |
||||||
|
15,0 | |||||||
1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the request of the consumer.
2. TECHNICAL REQUIREMENTS2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations approved in the prescribed manner, from steels in accordance with GOST 380-88 and GOST 1050-88 without standardizing mechanical properties and chemical composition.
Pipes for parts of water supply and gas supply structures are made of steel in accordance with GOST 1050-88.
2.2. At the request of the consumer, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring with a width of 1 - 3 mm should be left.
At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.
2.1; 2.2. (Modified edition, Amendments No. 3, 4).
2.3. At the request of the consumer, pipes are completed with couplings made in accordance with GOST 8944-75, GOST 8954-75, GOST 8965-75 and GOST 8966-75 at the rate of one coupling for each pipe.
(Modified edition, Amendment No. 3).
2.4. Cracks, captivity, swelling and sunsets are not allowed on the pipe surface.
No delamination is allowed at the ends of the pipes.
Separate dents, ripples, risks, traces of cleaning and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.
On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam, if there is a shallow thickening in this place of not more than 1.0 mm along the inner diameter.
(Modified edition, Amendments No. 3, 4).
2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, on the inner surface of the pipe seam, the burr must be cut or flattened, while the height of the burr or its traces should not exceed 0.5 mm.
At the request of the consumer, on pipes with a nominal bore of more than 15 mm, made by furnace welding and by the method of hot reduction, a gentle thickening with a height of no more than 0.5 mm is allowed on the inner surface of the pipes in the seam zone.
(Modified edition, Amendments No. 2, 3, 4, 5, 6).
2.6. The ends of the pipes must be cut at right angles. The size of the bevel of the butt is allowed not more than 2 °. Burr residues should not exceed 0.5 mm. When removing burrs, the formation of bluntness (rounding) of the ends is allowed. Cutting of pipes in the mill line is allowed.
By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.
(Modified edition, Amendments No. 4, 6).
2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of the pipes is allowed.
On the surface of galvanized pipes, blistering and foreign inclusions (hard zinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.
Separate flux spots and traces of pipe gripping by lifting devices, roughness and slight local influx of zinc are allowed.
It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307-89.
(Modified edition, Amendments No. 3, 4).
2.8. The pipes must be able to withstand the hydraulic pressure:
2.4 MPa (25 kgf / cm 2) - pipes, ordinary and light;
3.1 MPa (32 kgf / cm 2) - reinforced pipes.
At the request of the consumer, pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2)
(Modified edition, Amendments No. 2, 3, 5).
2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 of the outer diameter, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 of the outer diameter.
At the request of the consumer, pipes must withstand the expansion test:
for pipes with nominal bore from 15 to 50 mm - not less than 7%;
for pipes with a nominal bore of 65 and more - at least 4%.
At the request of the consumer, pipes must withstand the flattening test up to a distance between flattened surfaces equal to 2/3 of the outer diameter of the pipes.
(Modified edition, Amendments No. 2, 3, 5).
2.10. At the request of the consumer, the mechanical properties of pipes for parts of water and gas pipelines must comply with GOST 1050-88.
2.11. The pipe thread must be clean, without flaws and burrs and comply with GOST 6357-81, accuracy class B.
Pipes with cylindrical threads are used for assembly with seals.
2.10; 2.11. (Modified edition, Amendments No. 3, 4).
2.12. In the place of the seam, blackness on the threads is allowed if the decrease in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.
Threads with stripped (for cut) or incomplete (for rolled) threads are allowed on the thread, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.
(Modified edition, Amendments No. 2, 3, 5).
2.13. Allowed on the thread to reduce the useful length of the thread (without runaway) up to 15% compared to that indicated in table. 4, and at the request of the consumer up to 10%.
(Modified edition, Amendments No. 2, 3, 5).
2.14. Threading on galvanized pipes is carried out after galvanizing.
2.15. (Deleted, Amendment No. 3).
2.16. At the request of the consumer, pipe welds are subjected to non-destructive testing.
(Modified edition, Amendment No. 5).
3. RULES OF ACCEPTANCE
3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, of the same brand and be accompanied by one quality document in accordance with GOST 10692-80 with an addition for pipes intended for the manufacture of parts of water supply and gas pipelines, made of steel in accordance with GOST 1050-88: chemical composition and mechanical properties steel in accordance with the document on the quality of the manufacturer of the billet.
The mass of the batch is not more than 60 tons.
(Modified edition, Amendments No. 3, 4).
3.2. The surface, dimensions and curvature are checked for each pipe in the batch.
It is allowed to apply statistical control methods in accordance with GOST 18242-72 with a normal level. Control plans are established by agreement between the manufacturer and 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, Amendments No. 3, 4, 5).
3.3. To control the parameters of the thread, for testing for expansion, flattening, bending, the height of the internal burr, the remnants of burrs, the right angle and the angle of the chamfer (for pipes with beveled edges), mechanical properties, take no more than 1%, but not less than two pipes from the batch, and for pipes made by continuous furnace welding, two pipes per batch.
(Modified edition, Amendments No. 3, 4).
3.4. All pipes are subject to weight control.
(Modified edition, Amendment No. 3).
3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the welded seam by non-destructive methods, it is allowed not to carry out a hydraulic pressure test. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.
(Modified edition, Amendment No. 6).
3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the batch.
(Modified edition, Amendment No. 2).
3.7. Upon receipt of unsatisfactory test results for at least one of the indicators for it, a repeated test is carried out on a doubled sample.
Retest results apply to the entire batch.
4. TEST METHODS
4.1. For quality control, one sample is cut from each selected pipe for each type of test.
The tensile test is carried out in accordance with GOST 10006-80. Instead of tensile testing, it is allowed to carry out control of mechanical properties by non-destructive methods.
4.2. Inspection of the pipe surface is carried out visually.
4.3. The hydraulic test is carried out in accordance with GOST 3845-75 with holding under test pressure for at least 5 s.
4.4. The bend test is carried out in accordance with GOST 3728-78. Galvanized pipes are tested prior to coating.
(Modified edition, Amendment No. 3).
4.4a. The expansion test is carried out in accordance with GOST 8694-75 on a tapered mandrel with a taper angle of 6 °.
Testing on a mandrel with a taper angle of 30 ° is allowed.
(Modified edition, Amendments No. 3, 4).
4.4b. Flattening test is carried out according to GOST 8695-75.
(Modified edition, Amendment No. 3).
4.4c. The control of the welded seam is carried out by non-destructive methods according to the normative and technical documentation.
(Introduced additionally, Amendment No. 3).
4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301-86 and GOST 9.302-88, as well as with devices of the MT-41NTs, MTZON or Impulse type according to the normative and technical documentation.
4.6. The thread is checked with threaded ring gauges in accordance with GOST 2533-88 (third class of accuracy).
In this case, the screwing capacity of the no-through ring gauge on the thread should be no more than three turns.
(Modified edition, Amendments No. 3, 4).
4.7. The curvature of the pipes is controlled with a straight edge in accordance with GOST 8026-92 and a set of probes in accordance with TU 2-034-225-87.
(Modified edition, Amendments No. 3, 5).
4.8. The right angle of the pipe ends is controlled with a 90 ° square with a size of 160x100 mm, class 3 GOST 3749-77, plate probes set 4 TU 2-034-225-87 or a goniometer GOST 5378-88. The bevel angle of the chamfer is controlled by a goniometer in accordance with GOST 5378-88.
(Modified edition, Amendments No. 3, 6).
4.9. Outside diameter control is carried out with smooth micrometers in accordance with GOST 6507-90, calibers-staples in accordance with GOST 2216-84 or GOST 18362-73.
The wall thickness, the height of the inner burr and the height of the burrs are measured with a micrometer in accordance with GOST 6507-90 or a wall gauge in accordance with GOST 11358-89 from both ends of the pipe.
The length of the pipes is measured with a tape measure in accordance with GOST 7502-89. The thread is controlled with gauges in accordance with GOST 2533-88.
The control of the mass of a batch of pipes is carried out on a scale of no more than 10 tons with a graduation price of no more than 20 kg.
(Changed edition, Amendments No. 3, 4, 5, 6).
4.10. The control of the welded seam is carried out by non-destructive methods according to the technical documentation.
(Introduced additionally, Amendment No. 4).
5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692-80 with the addition.
5.1.1. The pipe thread must be protected from mechanical damage and corrosion with a lubricant according to the normative and technical documentation.
Sec. 5. (Modified edition, Amendment No. 3).
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
DEVELOPERS
V. I. Struzhok, Cand. tech. sciences, V. M. Vorona, Cand. tech. sciences, Yu.M. Mironov, Cand. tech. nook, A. I. Postolova
2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the USSR State Committee for Standards dated 09/11/75 No. 2379
3. Inspection frequency 5 years
4. REPLACE GOST 3262-62
5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS
|
Item number |
|
|
GOST 9.301-86 | |
|
GOST 9.302-88 | |
|
GOST 9.307-89 | |
|
GOST 380-88 | |
|
GOST 1050-88 |
2.1, 2.10, 3.1 |
|
GOST 2216-84 | |
|
GOST 2533-88 |
4.6, 4.9 |
|
GOST 3728-78 | |
|
GOST 3749-77 | |
|
GOST 3845-75 | |
|
GOST 5378-88 | |
|
GOST 6357-81 |
2.11 |
|
GOST 6507-90 | |
|
GOST 7502-89 | |
|
GOST 8026-92 | |
|
GOST 8694-75 |
4.4a |
|
GOST 8695-75 |
4.4b |
|
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 18363-73 | |
|
TU 2-034-225-88 |
4.7, 4.8 |
6. Reprinted (May 1994) with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989. , November 1991 (IUS 1-78, 2-79, 4-87, 8-88, 2-90, 2-92)
This standard applies to non-galvanized and galvanized steel welded pipes with threaded or rolled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of plumbing and gas pipelines. You can use a pipe calculator to calculate pipe weight or pipe length.
1.1. Pipes are manufactured according to the dimensions and weight given in table. one.
At the request of the consumer, pipes of a light series intended for thread rolling are made according to the dimensions and weight given in table. 2.
1.2. The length of the pipe is made from 4 to 12 m:
a) measured or multiple measured lengths with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;
b) unmeasured length.
By agreement between the manufacturer and the consumer, in a batch of off-gauge pipes, up to 5% of pipes with a length of 1.5 to 4 m are allowed.
Table 1
|
Conditional pass |
Outside diameter |
Pipe wall thickness |
Weight of 1 m pipes, kg |
||||
|
ordinary |
reinforced |
ordinary |
reinforced |
||||
table 2
|
Conditional pass |
Outside diameter |
Wall thickness |
Weight of 1 m pipes, kg |
Notes:
1. For a thread made by the knurling method, on a pipe it is allowed to reduce its inner diameter by up to 10% along the entire length of the thread.
2. The mass of 1 m of pipes is calculated at a density of steel equal to 7.85 g / cm 3. Galvanized pipes are heavier than non-galvanized ones by 3%.
1.3. Limit deviations in pipe dimensions should not exceed those indicated in table. 3.
Table 3
|
Pipe dimensions |
Limit deviations for pipes of manufacturing accuracy |
|
|
increased |
||
|
Outside diameter with conventional bore: |
||
|
up to 40 mm incl. |
||
|
Over 40 mm |
||
|
Wall thickness |
||
Notes:
1. The maximum deviation to the plus side in the wall thickness is limited by the maximum deviations in the mass of the pipes.
2. Pipes of normal manufacturing accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water supply and gas supply structures.
1.4. Maximum deviations in pipe weight should not exceed + 8%.
At the request of the consumer, the maximum deviations in weight should not exceed:
7.5% - for the party;
10% - for a separate pipe.
1.5. The curvature of pipes for 1 m of length should not exceed:
2 mm - with nominal bore up to 20 mm inclusive;
1.5 mm - with a nominal bore over 20 mm.
1.6. The pipe threads can be long or short. The requirements for the thread must correspond to those indicated in table. 4.
Table 4
|
Nominal bore, mm |
Thread length before running away |
Nominal bore, mm |
Number of no-current at nominal size |
Thread length before running away |
|||
|
short |
short |
||||||
1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the request of the consumer.
Ordinary pipe, non-galvanized, of normal manufacturing accuracy, off-gauge length, with a nominal bore of 20 mm, wall thickness of 2.8 mm, without thread and without coupling:
The same with the clutch:
The same, measured length, with thread:
The same, with zinc coating, unmeasured length, with thread:
The same, with a zinc coating, measured length, with a thread:
For pipes for thread rolling, the letter H is indicated in the symbol after the word "pipe".
For pipes with a long thread, the letter D. is indicated in the symbol after the word "pipe".
For pipes of increased manufacturing accuracy, the letter P. is indicated in the symbol after the size of the nominal bore.
2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations approved in the prescribed manner, from steels in accordance with GOST 380-88 and GOST 1050-88 without standardizing mechanical properties and chemical composition.
Pipes for parts of water supply and gas supply structures are made of steel in accordance with GOST 1050-88.
2.2. At the request of the consumer, at the ends of pipes to be welded, with a wall thickness of 5 mm or more, chamfers must be made at an angle of 35-40 ° to the end of the pipe. In this case, an end ring with a width of 1 - 3 mm should be left.
At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.
2.3. At the request of the consumer, pipes are completed with couplings made in accordance with GOST 8944-75, GOST 8954-75, GOST 8965-75 and GOST 8966-75 at the rate of one coupling for each pipe.
2.4. Cracks, captivity, swelling and sunsets are not allowed on the pipe surface.
No delamination is allowed at the ends of the pipes.
Separate dents, ripples, risks, traces of cleaning and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.
On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam, if there is a shallow thickening in this place of not more than 1.0 mm along the inner diameter.
2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, on the inner surface of the pipe seam, the burr must be cut or flattened, while the height of the burr or its traces should not exceed 0.5 mm.
At the request of the consumer, on pipes with a nominal bore of more than 15 mm, made by furnace welding and by the method of hot reduction, a gentle thickening with a height of no more than 0.5 mm is allowed on the inner surface of the pipes in the seam zone.
2.6. The ends of the pipes must be cut at right angles. The size of the bevel of the butt is allowed not more than 2 °. Burr residues should not exceed 0.5 mm. When removing burrs, the formation of bluntness (rounding) of the ends is allowed. Cutting of pipes in the mill line is allowed.
By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.
2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of the pipes is allowed.
On the surface of galvanized pipes, blistering and foreign inclusions (hard zinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.
Separate flux spots and traces of pipe gripping by lifting devices, roughness and slight local influx of zinc are allowed.
It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307-89.
2.8. The pipes must be able to withstand the hydraulic pressure:
2.4 MPa (25 kgf / cm 2) - pipes, ordinary and light;
3.1 MPa (32 kgf / cm 2) - reinforced pipes.
At the request of the consumer, pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2)
2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 of the outer diameter, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 of the outer diameter.
At the request of the consumer, pipes must withstand the expansion test:
At the request of the consumer, pipes must withstand the flattening test up to a distance between flattened surfaces equal to 2/3 of the outer diameter of the pipes.
2.10. At the request of the consumer, the mechanical properties of pipes for parts of water and gas pipelines must comply with GOST 1050-88.
2.11. The pipe thread must be clean, without flaws and burrs and comply with GOST 6357-81, accuracy class B.
Pipes with cylindrical threads are used for assembly with seals.
2.12. In the place of the seam, blackness on the threads is allowed if the decrease in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.
Threads with stripped (for cut) or incomplete (for rolled) threads are allowed on the thread, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.
2.13. Allowed on the thread to reduce the useful length of the thread (without runaway) up to 15% compared to that indicated in table. 4, and at the request of the consumer up to 10%.
2.14. Threading on galvanized pipes is carried out after galvanizing.
2.16. At the request of the consumer, pipe welds are subjected to non-destructive testing.
3.1. Pipes are accepted in batches. A batch must consist of pipes of the same size, of the same brand and be accompanied by one quality document in accordance with GOST 10692-80 with an addition for pipes intended for the manufacture of parts of water supply and gas pipelines, made of steel in accordance with GOST 1050-88: chemical composition and mechanical properties of steel in accordance with the document on the quality of the manufacturer of the workpiece.
The mass of the batch is not more than 60 tons.
3.2. The surface, dimensions and curvature are checked for each pipe in the batch.
It is allowed to apply statistical control methods in accordance with GOST 18242-72 with a normal level. Control plans are established by agreement between the manufacturer and 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.
3.3. To control the parameters of the thread, for testing for expansion, flattening, bending, the height of the internal burr, the remnants of burrs, the right angle and the angle of the chamfer (for pipes with beveled edges), mechanical properties, take no more than 1%, but not less than two pipes from the batch, and for pipes made by continuous furnace welding, two pipes per batch.
3.4. All pipes are subject to weight control.
3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the welded seam by non-destructive methods, it is allowed not to carry out a hydraulic pressure test. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.
3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the batch.
3.7. Upon receipt of unsatisfactory test results for at least one of the indicators for it, a repeated test is carried out on a doubled sample.
Retest results apply to the entire batch.
4.1. For quality control, one sample is cut from each selected pipe for each type of test.
The tensile test is carried out in accordance with GOST 10006-80. Instead of tensile testing, it is allowed to carry out control of mechanical properties by non-destructive methods.
4.2. Inspection of the pipe surface is carried out visually.
4.3. The hydraulic test is carried out in accordance with GOST 3845-75 with holding under test pressure for at least 5 s.
4.4. The bend test is carried out in accordance with GOST 3728-78. Galvanized pipes are tested prior to coating.
4.4a. The expansion test is carried out in accordance with GOST 8694-75 on a tapered mandrel with a taper angle of 6 °.
Testing on a mandrel with a taper angle of 30 ° is allowed.
4.4b. Flattening test is carried out according to GOST 8695-75.
4.4c. The control of the welded seam is carried out by non-destructive methods according to the normative and technical documentation.
4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301-86 and GOST 9.302-88, as well as with devices of the MT-41NTs, MTZON or Impulse type according to the normative and technical documentation.
4.6. The thread is checked with threaded ring gauges in accordance with GOST 2533-88 (third class of accuracy).
In this case, the screwing capacity of the no-through ring gauge on the thread should be no more than three turns.
4.7. The curvature of the pipes is controlled with a straight edge in accordance with GOST 8026-92 and a set of probes in accordance with TU 2-034-225-87.
4.8. The right angle of the pipe ends is controlled with a 90 ° square with a size of 160x100 mm, class 3 GOST 3749-77, plate probes set 4 TU 2-034-225-87 or a goniometer GOST 5378-88. The bevel angle of the chamfer is controlled by a goniometer in accordance with GOST 5378-88.
4.9. Outside diameter control is carried out with smooth micrometers in accordance with GOST 6507-90, calibers-staples in accordance with GOST 2216-84 or GOST 18360-93.
The wall thickness, the height of the inner burr and the height of the burrs are measured with a micrometer in accordance with GOST 6507-90 or a wall gauge in accordance with GOST 11358-89 from both ends of the pipe.
The length of the pipes is measured with a tape measure in accordance with GOST 7502-98. The thread is controlled with gauges in accordance with GOST 2533-88.
The control of the mass of a batch of pipes is carried out on a scale of no more than 10 tons with a graduation price of no more than 20 kg.
4.10. The control of the welded seam is carried out by non-destructive methods according to the technical documentation.
5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692-80 with the addition.
5.1.1. The pipe thread must be protected from mechanical damage and corrosion with a lubricant according to the normative and technical documentation.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
DEVELOPERS
V. I. Struzhok, Cand. tech. Sciences, V. M. Vorona, Cand. tech. Sciences, Yu. M. Mironov, Cand. tech. Nuk, A.I. Postolova
2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the USSR State Committee for Standards dated 09/11/75 No. 2379
3. Inspection frequency 5 years
4. REPLACE GOST 3262-62
5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS
|
Item number |
|
|
GOST 9.301-86 |
|
|
GOST 9.302-88 |
|
|
GOST 9.307-89 |
|
|
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 7502-98 |
|
|
GOST 8026-92 |
|
|
GOST 8694-75 |
|
|
GOST 8695-75 |
|
|
GOST 8944-75 |
|
|
GOST 8954-75 |
|
|
GOST 8965-75 |
|
|
GOST 8966-75 |
|
|
GOST 10006-80 |
|
|
GOST 10692-80 |
|
|
GOST 11358-89 |
|
|
GOST 18242-72 |
|
|
GOST 18360-93 |
|
|
TU 2-034-225-88 |
6. Reprinted (May 1994) with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989. , November 1991 (IUS 1-78, 2-79, 4-87, 8-88, 2-90, 2-92)
The assortment of water and gas pipes is often needed for online calculation of the weight of pipes of water and gas supply systems during construction, laying communications, laying water pipes, installing gas pipe supports. The full range of pipes is used in the installation of heating systems and the execution of pipeline parts, in external drinking water supply networks.
GOST 3262-62 for plumbing and gas pipes allows the production of rolled pipes without threads at the ends or with threads, while the length of black pipes without threads ranges from 4 to 12 m, and black and galvanized ones with threads - from 4 to 8 m.
Steel water pipes GOST 3262-75 of increased manufacturing accuracy is used for parts of water supply and gas supply structures.
When welding pipelines in the case when water and gas pipes are used, manual welding or a sleeve connection is used. Couplings are used for VGP pipes with a normal wall thickness, welding is possible in all cases: light, ordinary, reinforced types of VGP.
The assortment of steel pipes for water and gas supply of normal accuracy allows the manufacture of steels in accordance with GOST 380 and GOST 1050 without standardizing the mechanical properties and chemical composition. The most popular assortment of pipes - black rolled pipes, is used for water pipelines, supporting elements of gas pipelines and heating systems. VGP pipes of increased accuracy are made of steels in accordance with GOST 1050. The range of galvanized pipes is used for parts of water and gas supply structures with high requirements for durability and corrosion resistance. Galvanized tapered pipes are also used for the manufacture of zinc-coated tubular lighting poles.
A round pipe is a type of rolled metal product range, which is produced by the method of electric welding. The technology for the production of rolled pipes consists in the fact that steel sheet blanks from a strip (steel sheet in coils) go through the process of unwinding and straightening on rolls, cut into a size of a given length and width, after which the edges of the strips are processed by chamfering. Next, the strips are welded into the butt, the sheet blanks enter the storage device for feeding the material to the forming mill, where they are profiled into round tube the required size of the diameter. Pipe wall thickness (thin-walled, thick-walled) depends on the thickness of the sheet strip. At the next stage, a longitudinal seam is welded (either in a straight line or in a spiral) by melting the edges of the metal with high-frequency currents, closing them into a permanent connection to obtain a solid metal over the entire section of a round pipe. Similarly, we manufacture metal tubular lighting poles with conical faceted and circular cross-section. At the final stage technological process the bead is removed on the finished product and the electric-welded pipe is cooled, calibrated to match the GOST diameters within tolerances and cut to the required size along the length.
1inch = 2.54cm
Quarter inch - 8 mm; half an inch - 15 mm; three quarters of an inch - 20 mm; inch - 25 mm; inch and a quarter - 32 mm; one and a half inches - 40 mm; two inches - 50 mm; two and a half inches - 65 mm; 4 inches - 100 mm.
This ratio between inches and millimeters greatly simplifies the selection of imported pipeline fittings for Ukrainian pipes, but here it is important to understand that such dimensions are also suitable for domestic bends, transitions, water taps, gas valves. Imported couplings, taps, bends, tees, squeegees (and now imported stainless pipe fittings are often used) have real inch dimensions, which are somewhat different from the connecting dimensions of VGP pipes.
|
Du, mm- inch |
Dн, mm |
Lungs | Conventional | Reinforced | ||||||
| S, mm | kg / m | m / t | S, mm | kg / m | m / t | S, mm |
kg / m |
m / t | ||
|
10,2 |
0,37 |
2681,8 |
0,40 |
2472,5 |
0,47 |
2106,4 |
||||
|
8 - 1/4 |
13,5 |
0,57 |
1763,0 |
0,61 |
1631,1 |
0,74 |
1353,4 |
|||
|
10 - 3/8 |
17,0 |
0,74 |
1351,6 |
0,98 |
1019,8 |
0,98 |
1019,8 |
|||
|
15 - 1/2 |
21,3 |
1,16 |
862,7 |
1,28 |
782,8 |
1,43 |
700,1 |
|||
|
20 - 3/4 |
26,8 |
1,50 |
667,5 |
1,66 |
603,4 |
1,86 |
536,9 |
|||
|
25 - 1 |
33,5 |
2,12 |
471,7 |
2,39 |
418,2 |
2,91 |
343,6 |
|||
|
32 - 1 1/4 |
42,3 |
2,73 |
366,6 |
3,09 |
324,1 |
3,78 |
264,7 |
|||
|
40 - 1 1/2 |
48,0 |
3,33 |
300,4 |
3,84 |
260,3 |
4,34 |
230,4 |
|||
|
50 - 2 |
60,0 |
4,22 |
237,1 |
4,88 |
205,1 |
6,16 |
162,4 |
|||
|
65 - 2 1/2 |
75,5 |
5,71 |
175,3 |
7,05 |
141,8 |
7,88 |
126,9 |
|||
|
80 - 3 |
88,5 |
7,34 |
136,3 |
8,34 |
120,0 |
9,32 |
107,3 |
|||
|
90 - 3 1/2 |
101,3 |
8,44 |
118,5 |
9,60 |
104,2 |
10,74 |
93,1 |
|||
|
100 - 4 |
114,0 |
10,85 |
92,2 |
12,15 |
82,3 |
13,44 |
74,4 |
|||
|
125 - 5 |
140,0 |
13,42 |
74,5 |
15,04 |
66,5 |
18,24 |
54,8 |
|||
|
150 - 6 |
165,0 |
15,88 |
63,0 |
17,81 |
56,1 |
21,63 |
46,2 | |||
where, Du- nominal bore diameter, mm
Dн- outer diameter of the pipe, mm
S- pipe wall thickness in mm,
kg / m- the number of kilograms in one meter of the pipe,
m / t- how many meters per ton of pipe
The weight per linear meter of steel pipe in the table is theoretical weight. Actual value may vary by 4-8%
To convert meters into kilograms of pipe, you need to multiply the value of the weight of a running meter in the assortment table by the total length of rolled pipes.
Standard designation of the pipe diameter in the assortment (see table):
Maximum deviations for the mass of pipes in the table of diameters and weight data should not exceed + 8%
Calculation of the weight of stainless steel pipe: m = Pi * (d - s) * s * R / 1000
Formula for calculating the weight of a "black" pipe: m = (d - s) * s / 40.55
where:
m- theoretical mass of one running meter of a pipe (specific gravity) in kg,
Pi= 3.14 (constant in our calculation),
d- outer diameter in mm,
s- wall thickness in mm,
R- specific gravity of steel in g / cu. cm.
Weight 1 m VGP pipes in the assortment is calculated with a specific gravity of steel equal to 7.85 g / cm3. Galvanized steel tubular products are 3% heavier than non-galvanized ones. To automate the pipe calculation process, you can use online calculator pipes (round, VGP, seamless, electric-welded), presented in the section of the site "Range of rolled metal products". In this pipe metal calculator, you can select the material from which the pipe is made for a more accurate weight calculation.
Steel pipes, depending on their parameters and cross-sectional dimensions: diameter and wall thickness, have a different scope of application:
Installation of heating systems, laying of water supply lines, gas pipelines, installation of sewerage, sewerage and gas supply;
manufacture and construction of fences and barriers, protection electrical cables from damage;
transportation of substances under pressure over long distances: oil, chemicals and gas;
production of wells, casing strings in mining;
production and installation of simple and complex metal structures, lighting poles;
distribution tap water, feed technical water in irrigation systems;
production of furniture frames;
exploration and development of oil and gas fields, etc.
Examples of symbols:
Ordinary steel pipe, non-galvanized, of usual manufacturing accuracy, off-gauge length, with a nominal bore of 20 mm, wall thickness of 2.8 mm, without thread and without coupling: water pipe 20x2.8 GOST 3262-75.
Example of designation: pipe M-20x2.8 GOST 3262-75 - with a coupling.
Legend: pipe Р-20х2.8-4000 GOST 3262-75 - measured length, with thread.
Steel water and gas pipes for thread rolling are marked: the letter H is indicated in the symbol, the letter D is indicated in the marking of VGP with a long thread.
For rolled steel pipes of increased manufacturing accuracy, the letter P. is indicated in the symbol after the size of the nominal bore.
Water and gas pipes undergo 100% non-destructive eddy current testing, and are supplied with a hydrotest guarantee.
GOST technical requirements
In accordance with the requirements of the standard, depending on the type, pipes must withstand the following hydraulic pressure:
Ordinary and light - exposed to an internal hydrostatic pressure of 2.4 MPa (25 kgf / cm2);
Reinforced - the action of a hydrostatic pressure of 3.1 MPa (32 kgf / cm2).
Steel pipe grades
Pipes are made of steels according to DSTU 2561 (GOST 380), parts of water and gas pipelines are made of steels corresponding to GOST 1050.
