Water and gas pipes (WGP): types, characteristics, application

Water and gas pipes are widely popular when laying various communications in the field of housing and communal services. Where are VGP pipes mainly used? What distinctive qualities are they characterized by? What assortment is produced by manufacturers? The answers follow.

HSV pipes

The relevance of using pipes of this category

The high popularity enjoyed by VGP pipes made from steel alloys can be explained very simply. No matter how exceptional the characteristics of today's popular pipes made of polymeric materials may be, their use in many cases is simply not possible. Such cases, in particular, include installation of a pipeline in the open air, where it will be affected by a lot of negative factors.

The demand for such products is also explained by the fact that, according to generally accepted requirements, pipelines for transporting gas and supplying it to consumers can only be made of steel pipes. That is why VGP pipes are simply an irreplaceable material in any gas industry.

Gas supply to a private home is a typical example of using VGP pipes

This is interesting: How to attach an anchor bolt: video, photos, nuances, tips

Measurement systems

The table shows the sizes of different types of pipes. Data shown in millimeters and inches.

Steel pipes are not losing ground and are still the main material for laying gas and water mains.

In this work, pipe diameters indicated in inches are used. With this approach, there are no difficulties during pipeline installation.

What do you know about the sizes of plumbing hatches for the bathroom and toilet? Which ones are installed on the wall and which ones are installed on the floor under the tiles is written in a useful article.

A heating diagram with a solid fuel boiler and a heat accumulator is published here.

But when replacing or installing a combined system , situations arise that require matching the sizes of products made from different materials, for example, with fiberglass-reinforced polypropylene pipes (read GOST here).

In such cases, tables of steel pipe sizes come to the aid of designers.

The standard shows the exact metric size of steel products and compliance with polymer pipes.

The standard range of diameters used in most countries (mm): 6, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 110, 125, 200 and so on.

Dimensions in inches are also used when designing. When translating, take into account that one inch is 2.54 centimeters.

Large-sized products are used when laying sewer lines (the depth of laying pipes in a private house is indicated on this page).

Steel grades and tolerances

The classification given above is quite incomplete. It can be continued almost endlessly. Such a huge range is due to the large number of applications for steel pipes.

Among other classifications, there is another one - by diameter. Naturally, thinner or thicker pipes are used for different purposes. Today, the industry produces steel products with a diameter from 17 to 114 mm. In this case, the following indicators are considered normal error:

• For products with diameters from 17 mm to 48 mm, the normal error (tolerance) can be considered 0.4-0.5 mm;
• For materials with diameters from 60 to 114 mm, the normal error is considered to be 0.8-1% of the diameter.

On the wall this figure is 15%.

Water and gas pipes of various diameters

It must also be said that these tolerances are typical only for the following grades of steel:

• 0.8ps and 0.8kp;
• 10;
• 15, 15ps, 15kp;
• 20, 20ps, 20kp;
• St1ps;
• St2ps;
• St3ps and St3kp.

Dimensions

Water and gas pipes are manufactured in accordance with GOST, which sets clear requirements for their sizes and basic characteristics:

• the wall thickness should be 2.5-4.5 mm, the permissible deviation is minimal and only on the condition that it does not reduce the reliability of the product and the quality of the product;
• the conventionally accepted DU for steel VGP pipes is 6-150 mm, while with a length of more than 20 mm, a deviation from the established standard of 2 mm is allowed; if the length is less, then the deviation should not exceed 2 mm;
• the outer diameter of the water and gas pipe can be from 10 to 165 m, the total number of standard sizes is 14, and the basic classification of products is carried out precisely on this basis;
• the length of the pipes varies from 4 to 12 meters, while for each linear meter a two-millimeter curvature of the pipe is allowed;
• Pipe threads must be applied with a aligned cylindrical or knurled end.

This is interesting: Stainless steel marking: subtleties of stainless steel designation

DIMENSIONS OF ELECTRIC WELDED PIPES ACCORDING TO GOST 10704-91

Straight-seam electric welded pipes come in the following outer diameters (in millimeters): 10; 12; 13; 14; 16; 17; 17.5; 18; 19; 20; 21.3; 22; 24; 25; 26; 28; thirty; 32; 33; 33.7; 36; 38; 40; 42; 43; 45; 48; 51. For diameters up to 57 mm, a VGP pipe of the appropriate size is used. The most popular are straight-seam pipes in accordance with GOST 10704-91 with sizes of 57 mm and above. Their main diameters: 57; 60; 63.5; 76; 89; 102; 108; 114; 127; 133; 140; 146; 159; 168; 178; 193; 219; 245; 273; 325; 377; 426; 530.

Some technical requirements

All steel water and gas supply materials are manufactured according to technical standards and have GOST 3262-75, as noted earlier. Production is carried out from types of steel (GOST 380 and GOST 1050) without standardization of the chemical composition and all mechanical qualities.

If necessary, the ends of the pipes can be chamfered at an angle of 40 degrees at the manufacturer's factory. With this type of work, an end ring is left, the width of which lies in the range from 1 to 3 mm.

It must be said that chamfers are removed from products whose wall thickness is more than 5 mm.

In addition, at the customer's request, threads can be applied to both ends. The condition is a conditional passage, which should not be less than 1 cm.

Among other things, individual water and gas supply elements can be equipped with couplings (GOST 8944,8954,8965 or 8966). In this case, each water and gas steel pipe must be equipped with one coupling.

The surface of the products must not have cracks, blisters or dents. There should be no delamination, chips or burrs at the ends.

The following defects are allowed:

• Risks;
• Individual dents;
• Traces of stripping;
• A layer of scale that does not interfere with inspection;
• Some manufacturing defects, but only if they do not reduce the wall thickness to the minimum value in some places.

Below is a table of correspondence of some parameters of water and gas products.

Rules for storage, transportation, packaging of VGP steel pipes

Water and gas pipes do not have specific packaging requirements. Exceptions are products with d=6...20 mm. These gas and water supply products are packaged in coils at the customer’s request.

When transporting VGP pipes, it is necessary to adhere to the basic principle - the products are firmly fixed to prevent losses.

Yulia Petrichenko, expert

Gas and water pipes are stored based on the properties of the material:

• If the products have a galvanized surface, then it is enough to fix them and cover them from moisture. Although these pipes are characterized by increased anti-corrosion properties, rust may appear in areas free of zinc coating due to high humidity;
• Non-galvanized VGP products are stored in a dry place, excluding moisture penetration. Firmly fixed.

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

table of correspondence

What to look for when choosing pipes

For the end user, who needs such steel pipes to solve specific problems, certain operational characteristics of these products are of interest, allowing them to be selected optimally.

In order to make the right choice of such pipes and use them in accordance with their main purpose, it is important to understand the classification of products. The criteria by which such classification is carried out are stipulated by the provisions of GOST 3262-75.

Important criteria for sorting pipes of the VGP category are the material and method of their manufacture, as well as the method of their processing. So, depending on these parameters, pipes are distinguished:

• made of ferrous metal, the surface of which is not protected in any way;
• pipes whose surface is galvanized.

Tubular products, on the inner and outer surface of which a thin layer of zinc is applied, even differ in appearance from ordinary ones, as can be seen by comparing their photos. Such surface treatment of pipe products is necessary in order to reliably protect them from the aggressive influence of the external environment. Pipes coated with a thin layer of zinc, due to the chemical properties of this metal, perfectly resist corrosion and can be successfully operated even in the most difficult conditions for a long period of time.

Important parameters of such pipes, regardless of whether they are galvanized or not, are their geometric dimensions: nominal diameter, which is denoted by the abbreviation DU, as well as their wall thickness.

All geometric parameters of pipes of the VGP category, including their diameter, must comply with the requirements specified in GOST. All geometric dimensions of pipes produced by modern industry can be selected using the appropriate tables.

From the production line, water and gas pipe products can be produced in two modifications:

• without thread;
• with ready-made threads on both ends, which are applied by rolling or cutting.

Decoding the numbers in the designation allows you to find out the exact diameter of the product. Thus, products for which their DU is designated by the number 50 (VGP pipe DU50) have a diameter equal to two inches. And for pipes of the VGP category, the designation of which includes DU25, the diameter is equal to one inch. Accordingly, the markings of water and gas pipes indicate their diameter in millimeters, and converting it into inches is not difficult.

Marking of steel water and gas pipes

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

Principles of marking VGP pipes:

1. “20x2.8 GOST 3262-75” (hereinafter without specifying GOST and number). Explanation of the designation:
   non-galvanized ordinary pipe;
2. wall thickness – 2.8 mm;
3. length – unmeasured;
4. dy – 20 mm (nominal diameter);
5. without thread/coupling.
6. "M-20x2.8". Explanation of the designation:
   non-galvanized ordinary;
7. wall thickness – 2.8 mm;
8. no thread;
9. length – unmeasured;
10. dy – 20 mm;
11. with coupling.
12. "R-20x2.8-5000". Explanation of the designation:
    non-galvanized ordinary;
13. wall thickness – 2.8 mm;
14. carving is present;
15. length – measured (5 m);
16. dy – 20 mm;
17. without coupling.
18. "Ts-R-20x2.8". Explanation of the designation:
    galvanized ordinary;
19. wall thickness – 2.8 mm;
20. carving is present;
21. length – unmeasured;
22. dy – 20 mm;
23. without coupling.
24. "Ts-R-20x2.8- 4000". Explanation of the designation:
    galvanized ordinary;
25. wall thickness – 2.8 mm;
26. carving is present;
27. length – measured (4 m);
28. dy – 20 mm;
29. without coupling.

Note:

• the letter “H” denotes knurled pipes with threads;
• the letter “D” indicates products with long threads;
• the letter “P” denotes VGP pipes with increased manufacturing precision.

Scope of application

The primary purpose of VGP pipes is to transport water (both hot and cold) and household gas to the end consumer. When installing a network of water and gas steel pipes, either welding, threaded adapters, or other additional parts and segments are used for connection. Most often, these products are present in household communications. A huge percentage of modern and private housing constructions and high-rises built in the past are equipped with VGP steel pipes for consumers to receive gas, heat and water.

In addition to their direct purpose, pipes are widely used for the construction of metal structures of various types and sizes: shelving and cabinets, scaffolding, fences and small architectural forms. But this is already a separate area of ​​their application, into which we will not delve too deeply.

For gas pipeline

Extra options

For the convenience of those who are going to purchase water and gas pipes and use them for certain purposes, the length of such products is also standardized and may correspond to one of the following categories:

• interval 4–12 meters - measured length;
• length of pipes, a multiple of their measured value;
• unmeasured length, which, nevertheless, must be within the limits of the measured value.

Consumers of such products should keep in mind that the price is set not per unit of pipe length, but per unit of its weight. It is also important to take into account that the weight of galvanized pipes is 3% higher than the weight of products made from unprotected steel.

Steels from which high-precision galvanized and non-galvanized pipe products are produced must comply with the requirements of GOST 1050, while the chemical composition and mechanical characteristics of the manufacturing material are not subject to standardization. The welds with which water and gas pipe products are connected after they are formed must be of a reinforced type.

Mechanical properties of rolled products used for pipe production

The range of water and gas pipe products made of black steel involves their production with several options for wall thickness. Depending on this parameter, such products are:

• light class;
• ordinary category;
• reinforced type.

The wall thickness of such products, which can be selected according to the assortment according to the table, is standardized by the requirements of GOST 3262-75. Based on this regulatory document, a range of pipe products is formed; it also stipulates a number of other parameters that such products must comply with: nominal diameter, outer diameter, theoretical weight of one linear meter.

Dimensions of light series pipes intended for thread rolling

Pipes of various classes are designed for operation under different operating pressures. Thus, pipes corresponding to the light category can be operated at a pressure not exceeding 25 kgf/cm2, and reinforced type products - 32 kgf/cm2.

At the request of the customer of a batch of water and gas pipes, long or short threads can be applied to their ends. Galvanized pipe products can be supplied to customers not only with threads, but also equipped with couplings for their installation.

Thread Requirements

ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, 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 for water supply and gas pipeline structures, 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 billet manufacturer.

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use 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.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment 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, the remains of burrs, the right angle and the chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch are selected, and for pipes manufactured by continuous furnace welding - two pipes per batch.

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

3.5. Each pipe is subjected to hydraulic pressure testing. With 100% quality control of the weld using 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.

(Changed 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 from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

Advantages and disadvantages

The water and gas pipe is characterized by high strength and good wear resistance.

The rigidity indicators of such products are equal to the quality characteristics of solid metal timber with similar diameter parameters.

The use of VGP pipes is in demand when constructing not only main lines, but also household pipelines, for example, when replacing polypropylene water supply pipes reinforced with fiberglass (the characteristics are written here), where gas or water is used as the working medium.

The main advantages of water and gas pipelines are presented:

• low coefficient of linear expansion, which prevents deformation of the structure under the influence of high temperatures and as a result of freezing of the working environment;
• high strength compared to polypropylene and other materials, as well as the possibility of use in creating pressure-type structures;
• good thermal conductivity , which has a positive effect on the long-term preservation of temperature indicators of the transported working medium (read reviews about a hot water meter with a temperature sensor on this page);
• tightness , allowing the delivery of gaseous and volatile substances, as well as acids and other chemically active components.

It is important to remember that high thermal conductivity can cause cooling of the transported working medium, therefore the use of VGP pipelines with the additional use of thermal insulation materials is considered optimal.

What do you know about the design and repair of a water ball valve? Read this useful article for instructions on how to disassemble and restore the tightness of shut-off valves for water supply inside buildings.

Watch a video on how to make a heat accumulator for heating boilers with your own hands on this page.

Black VGP pipe GOST 3262-75

Price list for black VGP pipes

Water and gas pipe

, also called
black VGP pipe
, is an advanced raw material used both in construction in the housing and communal services sector and in heavy industrial areas.
The process of connecting communication systems to residential complexes of a metropolis and laying heating mains to cottage villages today cannot be done without the use of black VGP pipes
.

Water and gas distribution and heating for various types of premises, the automotive industry and mechanical engineering in general, aircraft manufacturing and agricultural areas, complement the wide range of applications of VGP pipes

.
In practice, special components are used for drainage together with water and gas pipes
: plugs, bends, adapters, tees, etc.

Another distinctive feature of both the VGP GOST 3262-75 pipe and simple electric-welded pipes is corrosion resistance, which significantly increases the service life.

Length of water and gas pipe GOST 3262-75

varies from 4 to 12 m: – VGP pipes of unmeasured length; – VGP pipes of measured length; – VGP pipes of multiple measured lengths.

The weight of one meter of pipe is calculated based on the steel density of 7.85 g/cm. An important factor influencing the mechanical characteristics of pipes is the galvanizing process. Galvanized pipes have a specific gravity that exceeds the weight of a conventional water and gas pipe

by 3%, but thereby acquire effective anti-corrosion resistance.

All products undergo high-quality ultrasonic testing, which ensures strict compliance with standards. At the ends of the pipes, delamination is not allowed, but rippling, individual dents, and traces of stripping are allowed, if they do not take the thickness of the pipe beyond the minimum dimensions. The edges of the pipes must be cut at right angles, with a permissible deviation of 2 degrees.

Water and gas pipe GOST 3262-75

accepted in batches, where the final product must have one length, one size and one grade of steel.
Depending on the manufacturer, the water and gas pipe is produced in the specified length: 5.9 m; 6m; 7.9m; 10m; 10.4m. Basically, the rolling of VGP pipes
is carried out from the following steel grades: 1ps, 2ps, 3ps, etc.

Common sizes and designations of water and gas pipes: – VGP 15 pipe

–
VGP 20 pipe
–
VGP 32
–
VGP 40
–
VGP 50 pipe
Price list for black VGP pipes

Galvanized pipes VGP are manufactured: - galvanized water and gas pipes from 4 to 11 m - of unmeasured length; - galvanized water and gas pipes of 6 m, 5.9 m, 10 m, 10.4 m - of measured length.

Galvanized pipes VGP

effectively used in the construction of communication water supply systems; in construction in the private sector they have found their application as a reliable structural element.

Galvanized pipe GOST 3262-75

are actively used in the housing and communal services sector, in environments subject to aggressive corrosive conditions. They often differ from simple black VGP pipes only in their galvanized coating.

Cold resistance, excellent weldability of the seam, reliability of the zinc coating of both the entire pipe and the seam, increased service life, all this is a galvanized water and gas pipe

.

The coating and chemical and physical properties acquired during the surface treatment of pipes with zinc significantly reduce the corrosion rate, thereby making galvanized pipes VGP

more attractive to target client audiences.

Galvanized pipe GOST 3262-75

, the size of which is determined by the nominal diameter of
the control valve . The most common sizes of galvanized water and gas pipes
are: DN 15, DN 20, DN 25, DN 32, DN 40, DN 50. In addition, galvanized steel pipes VGP differ in the presence of threads. Threads come in threaded and rolled cylindrical types.

offers you a wide range of products: galvanized water pipe and electric-welded galvanized pipe. Our managers are guaranteed to organize delivery of products to the final facility in a short time.

Sales department

Source: https://kpmtrade.ru/truba_vgp_chernaya.html