Pipe supports are used to hold elements of trunk networks. They are laid during the installation of pipe lines. They are made of steel of various strength characteristics and corrosion resistance.
Pipeline support prices add up
INTERSTATE STANDARD
Official edition
Standartinform
UDC 669.14-462:006.354
Group B62
Water-supply and gas-supply steel pipes. Specifications
MKS 23.040.10 OKP 13 8500, 13 8501
Introduction date 01.01.77
This standard applies to non-galvanized and galvanized steel welded pipes with threaded or knurled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.
(Changed edition, Rev. No. 2, 3, 5).
1.1. Pipes are made according to the dimensions and weight given in table. one.
At the request of the consumer, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table. 2.
(Changed edition, Rev. No. 1, 3).
1.2. The length of the pipe is made from 4 to 12 m:
measured or multiple measured length with an allowance for each cut of 5 mm and a longitudinal deviation for the entire length plus 10 mm;
unmeasured length.
By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of off-gauge pipes.
Official edition
Reprint prohibited
© Standards Publishing House, 1976 © Standartinform, 2007
Dimensions, mm
Table 1
Pipe Wall Thickness |
Weight of 1 m of pipes, kg |
||||||
Table 2 Dimensions, mm
Notes:
1. For a thread made by knurling, a reduction in its inner diameter of up to 10% along the entire length of the thread is allowed on the pipe.
2. The mass of 1 m of pipes is calculated with a steel density of 7.85 g / cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.
1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table. 3.
Table 3
Notes:
1. The maximum deviation in the plus side along the wall thickness is limited by the maximum deviations in the mass of pipes.
2. Pipes of ordinary manufacturing accuracy are used for water pipes, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water and gas pipeline structures.
1.4. Maximum deviations in the mass of pipes should not exceed +8%.
At the request of the consumer, the maximum deviations in mass should not exceed:
7.5% - for the party;
10% - for a single pipe.
(Changed edition, Rev. No. 2, 5).
1.5. The curvature of pipes per 1 m of length should not exceed:
2 mm - with nominal bore up to 20 mm inclusive;
1.5 mm - with nominal bore over 20 mm.
1.6. Pipe threads can be long or short. Thread requirements must comply with those specified in table. 4.
Table 4
Conditional passage, mm |
Thread length to the run, mm |
Conditional passage, mm |
Number of threads with conditional passage |
Thread length to the run, mm |
|||
short |
short |
||||||
Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm, at the request of the consumer, are wound into Examples of symbols
Ordinary pipe, non-galvanized, of the usual manufacturing accuracy, random length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without thread and without a coupling:
Pipe 20x2.8 GOST 3262-75
The same with the clutch:
Pipe M-20 x 2.8 GOST 3262-75 The same, measured length, threaded:
Pipe R-20x 2.8-4000 GOST 3262-75 The same, with zinc coating, random length, threaded:
Pipe Ts-R-20x 2.8 GOST 3262-75 The same, with zinc coating, measured length, threaded:
Pipe Ts-R-20x 2.8-4000 GOST3262-75
For pipes for thread rolling, the letter H is indicated after the word "pipe" in the symbol.
For pipes with a long thread, the letter D is indicated after the word “pipe” in the symbol. For pipes of increased manufacturing accuracy, the letter P is indicated in the symbol after the size of the nominal bore.
(Revised edition, Rev. 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 according to GOST 380 and GOST 1050 without standardization of mechanical properties and chemical composition.
Pipes for parts of water and gas pipeline structures are made of steel according to GOST 1050.
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 removed 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, the 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.
(Revised edition, Rev. No. 3).
2.4. Cracks, captivity, swelling and sunsets are not allowed on the surface of the pipes.
At the ends of the pipes, delamination is not allowed.
Separate dents, ripples, risks, traces of stripping and other defects due to the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a scale layer 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 weld site if there is a gentle thickening of the inner diameter of not more than 1.0 mm in this place.
(Changed edition, Rev. 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 the method of furnace welding and the method of hot reduction, a gentle thickening of a height of not more than 0.5 mm is allowed on the inner surface of the pipes in the weld zone.
(Changed edition, Rev. No. 2, 3, 4, 5, 6).
2.6. Pipe ends must be cut square. The value of the bevel of the end is allowed no more than 2 °. Burr residues should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.
By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.
(Changed edition, Rev. No. 4, 6).
2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.
On the surface of galvanized pipes, blistering and foreign inclusions (hardzinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.
Separate flux spots and traces of pipes being caught by lifting devices, roughness and slight local zinc deposits 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.
(Changed edition, Rev. No. 3, 4).
2.8. Pipes must 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 a 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, the 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 mm or more - at least 4%.
At the request of the consumer, the pipes must withstand the flattening test up to a 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 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 when assembling with seals.
2.12. In the place of the seam, blackness on the threads of the thread 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 broken (for cut) or incomplete (for knurled) threads are allowed on threads, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.
2.13. It is allowed on the thread to reduce the useful length of the thread (without run-off) 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, welded seams of pipes are subjected to control by non-destructive methods.
(Revised edition, Rev. No. 5).
3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same steel grade and be accompanied by one quality document in accordance with GOST 10692 with an addition for pipes intended for the manufacture of parts for water and gas pipeline structures, from steel in accordance with GOST 1050; chemical composition and mechanical properties of steel - in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.
Party weight - no more than 60 tons.
(Changed edition, Rev. No. 3, 4).
3.2. The surface, dimensions and curvature are checked for each pipe of the batch.
It is allowed to apply statistical control methods according to GOST 18242* with a normal level. Control plans are established by agreement between the manufacturer and the consumer.
The control of the outer diameter of the pipes is carried out at a distance of at least 15 mm from the end of the pipe.
(Changed edition, Rev. No. 3, 4, 5).
3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, burr residues, right angle and chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the lot are selected, and for pipes manufactured by continuous furnace welding, two pipes per batch.
(Changed edition, Rev. No. 3, 4).
3.4. All pipes are subjected to mass control.
(Revised edition, Rev. No. 3).
3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the weld by non-destructive methods, hydraulic pressure testing may not be carried out. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.
(Revised edition, Rev. 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 lot.
(Revised edition, Rev. No. 2).
3.7. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample.
The retest results apply to the entire lot.
4.1. For quality control, one sample is cut from each selected pipe for each type of test.
The tensile test is carried out in accordance with GOST 10006. Instead of the tensile test, it is allowed to control the mechanical properties by non-destructive methods.
4.2. Inspection of the surface of the pipes is carried out visually.
4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure under test pressure for at least 5 s.
4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.
(Revised edition, Rev. No. 3).
4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6°.
The test can be carried out on a mandrel with a taper angle of 30°.
(Changed edition, Rev. No. 3, 4).
GOST R 50779.71-99 is valid on the territory of the Russian Federation.
4.46. The flattening test is carried out according to GOST 8695.
(Revised edition, Rev. No. 3).
4.4c. Weld seam control is carried out by non-destructive methods according to normative documentation.
(Introduced additionally, Rev. 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 or Impulse types according to regulatory documentation.
4.6. The thread is checked with threaded ring gauges according to GOST 2533 (third class of accuracy).
In this case, the screwing of the non-going gauge-ring on the thread should be no more than three turns.
(Changed edition, Rev. No. 3, 4).
4.7. The curvature of the pipes is controlled by a straightedge according to GOST 8026 and a set of probes according to ID.
(Changed edition, Rev. No. 3, 5).
4.8. The right angle of the ends of the pipes is controlled by a 90 ° square with a size of 160 x 100 mm class 3 according to GOST 3749, with lamellar probes of set 4 according to ID or a goniometer according to GOST 5378. The bevel angle of the chamfer is controlled by a goniometer according to GOST 5378.
(Changed edition, Rev. No. 3, 6).
4.9. The control of the outer diameter is carried out with smooth micrometers in accordance with GOST 6507, with staple gauges in accordance with GOST 2216 or GOST 18360.
The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507 or a wall gauge according to GOST 11358 from both ends of the pipe.
The length of the pipes is measured with a tape measure 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 scales not exceeding Utah with a division value of not more than 20 kg.
(Changed edition, Rev. No. 3, 4, 5, 6).
4.10. Weld seam control is carried out by non-destructive methods according to technical documentation.
(Introduced additionally, Rev. No. 4).
5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.
5.1.1. Pipe threads must be protected from mechanical damage and corrosion by grease in accordance with regulatory documents.
Sec. 5. (Changed edition, Rev. No. 3).
IN AND. Shavings, Ph.D. tech. sciences; V.M. Crow, Ph.D. tech. sciences; Yu.M. Mironov, Ph.D. tech. sciences; A.I. Postolova
Item number |
Item 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 Proofreader A.S. Chernousova Computer proofing I.A. Naleykina
Handed over to the set 05/14/2007. Signed for publication on 06/05/2007. Format 60 x 84 Vs - Offset paper. Headset Times. Offset printing. Uel. oven l. 0.93. Uch.-ed. l. 0.80. Circulation 126 copies. Zach. 421. From 4031.
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There are many varieties of shaped products with a round profile. Products made of plastics (including composite ones) have seriously competed with traditional pipes made of metals. But, despite the universality of the use of polymer samples, in the conditions of laying routes outside buildings, when used in a number of pressure systems, there is no alternative to hardware. This article is about the features and characteristics of water and gas pipes (VGP).
Specifications for VGP are determined in years. Anyone who wants to understand the issue more thoroughly, it will be easy to do. But since the terminology and most of the parameters are incomprehensible to the average consumer (and therefore uninteresting), and some are not so significant, we will limit ourselves to only the main characteristics that are of practical importance during the installation and operation of a water supply or gas supply system.
The material is high quality steel. Pipes can be without a protective coating or. The latter are used for the installation of structures (contours), the operation of which will take place in conditions of excessive humidity. All blanks are welded, which increases their strength.
It is allowed to have:
The main linear parameters are in "mm".
By agreement with the customer, in a batch of water and gas pipes, it is allowed to have off-gauge products not exceeding 5% of the total quantity (with a length of 1.5 - 4 m).
At the request of the customer - up to 50.
The mass of galvanized pipes is 3% higher than the value of a similar parameter for samples without a protective coating.
Example 32 x 4 GOST 3262-75 - non-galvanized, random length, normal accuracy, Dy \u003d 32, wall \u003d 4. Ts-R-32 x 4 GOST-6000 3262-75 - the same product with thread, galvanized, measured length 6 m.
Given the high cost of production, zealous owners often give VGP blanks a “second life”.
It depends on many factors, so it is appropriate to give only a few examples of the cost (in RUB/rm).
Pipes of the VGP category are a group of water and gas pipes made of steel. Moreover, there are galvanized and non-galvanized options. Pipes are hollow, cylindrical in shape, having a longitudinal welded seam.
The category has three options for wall thickness - thick-walled, medium and thin-walled. An assortment of this nature makes it possible to use pipes suitable specifically for the project in which they are used.
The name speaks for itself - a pipe of this type can be used both in plumbing systems and in gas pipelines. In principle, the VGP pipe is considered a universal option for many applications.
Standard pipes have a length of segments from 4 m to 12 m. Moreover, there is a choice of material - without thread, or with cylindrical or knurled threads at the ends. Moreover, it can be short or long - it all depends on the nuances in use.
Typically, the VGP pipe has three strength categories:
Although such pipes are heavier than non-galvanized ones, by about 3%, the coating gives an excellent result when liquids pass through the line. The pipe does not rust, and its service life is extended significantly.
Advantages of VGP pipes
- Standard pipes VGP GOST 3262 75 are made of high quality steel.
- The so-called "black pipes" of the VGP have a reinforced welded seam.
- Pipes of this type have three categories convenient for the consumer - light, reinforced and ordinary. This allows you to choose the right option for the perfect design of the highway.
- The thread at the ends of the pipes can be long, short, or applied, depending on the wishes of the customer, to the desired side in the required parameters.
- Pipes of this category are supplied either with or without couplings.
- Pipe parameters can be indicated in inches, which is considered the norm.
- The pipes being sold undergo mandatory hydro-vortex control, so compliance with the standards can be considered almost perfect.
- Low cost with excellent product quality is the guarantor of the assigned standards and regulations.
- Versatility in application. Pipes of the right type are ideal for installation and repair work of almost any category.
- A huge range of pipe varieties - from hot-rolled seamless to cold-rolled and electric-welded options.
- The presence of components - flanges, couplings, tees, bends, transitions and other things, as well as the possibility of their easy use in installation work.
As you understand, standard VGP pipes GOST 3262 75 have a wide range of applications. The presence of at least three types of this type makes it possible to use them in almost all areas of pipelines. Moreover, it is possible to select a category for the type of line, with a rich selection of pipe types for its installation.
The water and gas pipe will be made of steel for a long time. Alternative options - metal-plastic conduits, ceramic, can only be used in certain areas: local water pipes, free-flow sewage, communication inside the building. However, when installed above ground, the pipeline is exposed to too much weather. This excludes the use of plastic or other products.
Water and gas pipes are made from steel blanks - strips, by molding. The edges of the workpiece are welded. The seam is reinforced. Examination of the seam is the first task of quality control, as it represents a high-risk site. According to GOST 3262-75, radiography is used to determine the quality.
Water and gas pipes, as a rule, are made straight-seam, since for these products a more important quality is resistance to internal pressure, rather than resistance to external loads. Pictured is a gas pipeline.
Advantages:
Disadvantages:
Dimensions and possible deviations are regulated by GOST 3262-75.
Since we are talking about water pipes, instead of the inner diameter, an indicator such as a conditional passage is used. It is given in both inches and mm.
Different ways of laying the pipeline and different operating conditions imply different technical characteristics from each other. Rental produces several modifications.
The raw material in the manufacture of water and gas pipes is carbon steel of various grades. At the same time, GOST 3262-75 regulates two types of products:
In fact, both types of water and gas pipes are made of steel, but they pass different levels of control. As a result, they get:
Pipe water and gas GOST 3262-75 is available:
The wall thickness of the water and gas pipeline determines the strength and resistance to a certain hydraulic pressure. The classification is:
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