The VGP pipe, the abbreviation in the name of which stands for “water and gas pipeline,” is specially designed for laying water and gas communications. Even in our time, when modern manufacturers offer a huge range of pipes made from various materials, such specialized tubular steel products are very popular among construction and repair organizations, enterprises working in the housing and communal services sector.
You can familiarize yourself with all GOST requirements for steel VGP pipes by downloading this document in pdf format from the link below.
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 from polymer materials, 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.
The main material from which pipes belonging to the VGP category are produced is carbon steel. Technological process their production consists of the following stages:
The qualitative characteristics that pipes of the VGP category manufactured using this technology must meet are stipulated by the provisions of GOST 3262-75.
Taking into account the fact that pipes of this category are operated in rather difficult conditions, and very high demands are placed on the quality of the weld created. high requirements, the place of the formed connection must be checked using radiographic control methods.
The main influence on the service life of pipelines made from water and gas pipe products is their operating conditions, as well as the characteristics of the substance that is transported through them. This is explained by the fact that the transported substances have different chemical reactivity.
For the end user, who needs such steel pipes to solve specific problems, certain performance characteristics of these products, allowing you to select them 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:
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 tubular products is necessary in order to reliably protect them from aggressive influence external environment. Pipes coated with a thin layer of zinc thanks to chemical properties This metal perfectly resists corrosion and can be successfully used 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: conditional passage, which is denoted by the abbreviation DU, as well as the thickness of their wall.
All geometric parameters pipes of the VGP category, including their diameter, must meet the requirements specified in GOST. All geometric dimensions of pipes produced modern industry, can be selected from the corresponding tables.
From the production line, water and gas pipe products can be produced in two modifications:
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.
Water and gas pipes are divided into two main categories according to their accuracy classes.
The first category includes tubular products of ordinary precision. When producing products of this category, the following parameters are not standardized: chemical composition material of manufacture, its mechanical characteristics. Pipes of this category are quite successfully used for arranging gas and water communications for domestic purposes.
The second category includes water and gas pipe products of increased precision. Galvanized pipes also belong to this category. From such pipes, for which both the chemical composition of the manufacturing material and its mechanical characteristics are standardized, parts for industrial pipelines are made with increased requirements for their reliability.
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:
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.
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:
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 normative document and a range of pipe products is formed; it also stipulates a number of other parameters that such products must comply with: nominal diameter, outside diameter, theoretical mass of one linear meter.
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.
Water and gas pipe products made using welded joints are successfully used for the installation of pipelines through which both liquid and gaseous media are transported. For the production of such pipes, steel grades that can be easily connected by welding are used: 10, 20, 3SP, 3PS. Depending on the purpose and operating conditions of the pipeline for the installation of which such products will be used, they can be additionally subjected to heat treatment after manufacture.
Measured length similar products is in the range of 9–11.7 meters, and unmeasured, which should be within the measured range, is 4–11 m.
Permissible deviations in the dimensions of water and gas pipes depend on the length and diameter of the product. Thus, if there is a preliminary agreement with the customer of a batch of pipes, the following deviations in their geometric parameters are allowed:
Exists generally accepted technique calculating the weight of the pipe, where the density of the steel from which it is made is assumed to be 7.85 g/cm3. As mentioned above, the weight of galvanized pipe products is assumed to be 3% more than the weight of conventional ones.
This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.
| Designation: | GOST 3262-75* |
| Russian name: | Steel water and gas pipes. Specifications |
| Status: | active |
| Replaces: | GOST 3262-62 |
| Date of text update: | 01.10.2008 |
| Date added to the database: | 01.02.2009 |
| Effective date: | 01.01.1977 |
| Designed by: | Ministry of Ferrous Metallurgy of the USSR |
| Approved: | USSR State Committee for Standards (09/11/1975) |
| Published: | Publishing house of standards No. 1994 |
STEEL WATER AND GAS PIPES
TECHNICAL CONDITIONS
GOST 3262-75
PUBLISHING HOUSE OF STANDARDS
Moscow
STATE STANDARD OF THE USSR UNION
dateintroduction 01.01.77
This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.
1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.
At the consumer's request, 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 maximum deviation for the entire length plus 10 mm;
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 unmeasured pipes.
Table 1
| Conditional pass | Outside diameter | Pipe wall thickness | Weight of 1 m of pipes, kg |
||||
| ordinary | reinforced | ordinary | reinforced |
||||
table 2
Dimensions, mm
| Conditional pass | Outside diameter | Wall thickness | Weight of 1 m of pipes, kg |
Notes:
1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.
2. The weight of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.
1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.
Table 3
| Pipe sizes | Limit deviations for manufacturing precision pipes |
|
| increased |
||
| Outer diameter with nominal bore: | ||
| up to 40 mm incl. | ||
| - 0,5 |
||
| Outer diameter with nominal bore: over 40 mm | ||
| - 1,0 |
||
| Wall thickness | - 15 % | - 10 % |
Notes:
1. Maximum deviation the plus side of the wall thickness is limited by the maximum deviations in the weight of the pipes.
2. Pipes of standard manufacturing precision are used for water supply, gas pipelines and heating systems. Pipes with increased manufacturing precision 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 mass deviations should not exceed:
7.5% - for the party;
10% - for a separate pipe.
(Changed edition, Amendment 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 a nominal bore of more than 20 mm.
1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.
| Conditional bore, mm | Thread length before run-out, mm | Conditional bore, mm | Number of threads at nominal size | Thread length before run-out, mm |
|||
| short | short |
||||||
1.7. Pipes with a nominal diameter of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.
Examples of symbols
An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:
Pipe 20´ 2.8 GOST 3262-75
The same with the coupling:
Pipe M-20´ 2.8 GOST 3262-75
The same, measured length, thread:
Pipe R-20´ 2.8 - 4000 GOST 3262-75
The same, with zinc coating, of unmeasured length, with thread:
Pipe Ts-R-20´ 2.8 GOST 3262-75
The same, with zinc coating, measured length, with thread:
Pipe Ts-R-20´ 2.8 - 4000 GOST 3262-75
For pipes with rolling threads symbol After the word “pipe” the letter N is indicated.
For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.
For pipes with increased manufacturing precision, the letter P is indicated in the symbol after the size of the nominal bore.
(Changed edition, Amendment No. 1).
2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in in the prescribed manner, made of steel according to GOST380 and GOST1050 without standardization mechanical properties and chemical composition.
Pipes for parts of water and gas 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 1 - 3 mm wide should be left.
At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.
2.1; 2.2. (Changed edition, Amendment No. 3, 4).
2.3. At the request of the consumer, pipes are equipped with couplings manufactured in accordance with GOST8944, GOST8954, GOST8965 and GOST8966 at the rate of one coupling for each pipe.
(Changed edition, Amendment No. 3).
2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.
Delaminations are not allowed at the ends of the pipes.
Individual dents, ripples, scratches, traces of stripping 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 gentle thickening in this place along the inner diameter of no more than 1.0 mm.
(Changed edition, Amendment No. 3, 4).
2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, the burr on the inner surface of the pipe seam must be cut off or flattened, and the height of the burr or its traces should not exceed 0.5 mm.
At the request of the consumer, pipes with a nominal bore of more than 15 mm, manufactured by furnace welding and hot reduction, on inner surface pipes in the weld zone, a gentle thickening with a height of no more than 0.5 mm is allowed.
(Changed edition, Amendment No. 2, 3, 4, 5, 6).
2.6. The ends of the pipes must be cut at right angles. The allowed end bevel value is no more than 2 ° .The remaining burrs should not exceed 0.5 mm. When removing burrs, 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, manufactured by furnace welding.
(Changed edition, Amendment 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, bubbles and foreign inclusions (hartzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.
Individual flux stains and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.
It is allowed to correct individual non-galvanized areas by 0.5% outer surface pipes according to GOST 9.307.
(Changed edition, Amendment No. 3, 4).
2.8. Pipes must withstand hydraulic pressure:
2.4 MPa (25 kgf/cm 2) - pipes, ordinary and light;
3.1 MPa (32 kgf/cm 2) - reinforced pipes.
At the consumer's request, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)
2.9. Pipes with a nominal bore of 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 of 3.5 of the outer diameter.
At the consumer's request, pipes must withstand the distribution test:
for pipes with a nominal bore from 15 to 50 mm - no less than 7%;
for pipes with a nominal bore of 65 or more - no less than 4%.
At the consumer's request, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.
2.8,2.9. (Changed edition, Amendment No. 2, 3, 5).
2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas structures must comply with GOST 1050.
2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357, accuracy class B.
Pipes with cylindrical threads are used when assembling with seals.
2.10; 2.11. (Changed edition, Amendment No. 3, 4).
2.12. Blackness on the threads is allowed in the place of shwad 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 torn (for cut) or incomplete (for rolled) 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. For threads, it is allowed to reduce the useful length of the thread (without run-out) by up to 15% compared to that specified in, and at the request of the consumer up to 10%.
2.12.,2.13. (Changed edition, Amendment No. 2, 3, 5).
2.14. Threading of 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 inspection non-destructive methods.
(Changed edition, Amendment No. 5).
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 with the addition for pipes intended for the manufacture of parts for water and gas structures, made of steel according to GOST1050: chemical composition and mechanical properties of steel in accordance with the document on the quality of the workpiece manufacturer.
The batch weight is no more than 60 tons.
(Changed edition, Amendment No. 3, 4).
3.2. Each batch of pipes is subjected to inspection of the surface, dimensions and curvature.
It is allowed to use statistical control methods in accordance with GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.
Inspection of the outer diameter of pipes is carried out 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.
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 pipe surface is carried out visually.
4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure to 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.
(Changed edition, Amendment No. 3).
4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .
It is allowed to test on a mandrel with a taper angle of 30 ° .
(Changed edition, Amendment No. 3, 4).
4.4b. The flattening test is carried out according to GOST 8695.
(Changed edition, Amendment No. 3).
4.4v. Weld inspection is carried out using non-destructive methods according to regulatory 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 and GOST 9.302, as well as with instruments of the MT-41NTs, MTZON or “Impulse” type according to the regulatory and technical documentation.
4.6. The thread is checked using thread ring gauges in accordance with GOST 2533 (third accuracy class).
In this case, the screwability of the non-go-through ring gauge onto the thread should be no more than three turns.
(Changed edition, Amendment No. 3, 4).
4.7. The curvature of the pipes is controlled using a straight edge in accordance with GOST 8026 and a set of feelers according to ND.
(Changed edition, Amendment No. 3, 5).
4.8. The right angle of the pipe ends is controlled with a 90 square ° size 160´ 100 mm class 3 GOST 3749, plate probes set 4 according to ND or inclinometer GOST 5378. The bevel angle is controlled with a protractor according to GOST 5378.
(Changed edition, Amendment No. 3, 6).
4.9. The outer diameter is checked using smooth micrometers in accordance with GOST 6507, clamp 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 6507-90 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 according to GOST 7502. The threads are controlled with gauges according to GOST 2533.
The mass of a batch of pipes is controlled on scales of no more than 10 tons with a division value of no more than 20 kg.
(Changed edition, Amendment No. 3, 4, 5, 6).
4.10. Weld inspection is carried out using non-destructive methods according to technical documentation.
(Introduced additionally, Amendment No. 4).
5.1. Labeling, 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 lubricant in accordance with regulatory and technical documentation.
Sec. 5. (Changed edition, Amendment No. 3).
1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy
DEVELOPERS
V. I. Struzhok, Ph.D. tech. sciences, V. M. Vorona, Ph.D. tech. sciences, Yu. M. Mironov, Ph.D. tech. nook, A. I. Postolova
2. APPROVED AND PUSHED INTO EFFECT by Resolution of the USSR State Committee for Standards of September 11, 1975 No. 2379
3. Inspection frequency 5 years
4. INSTEAD GOST3262-62
5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
| Item number |
|
| GOST 9.301-86 | |
| GOST 9.302-88 | |
| GOST 9.307-89 | |
| GOST 380- 94 | |
| GOST 1050-88 | |
| GOST 2216-84 | |
| GOST 2533-88 | |
| GOST 3728-78 | |
| GOST 3749-77 | |
| GOST 3845-75 | |
| GOST 5378-88 | |
| GOST 6357-81 | |
| GOST 6507-90 | |
| GOST 7502-89 | |
| GOST 8026-92 | |
| GOST 8694-75 | |
| GOST 8695-75 | |
| GOST 8944-75 | |
| GOST 8954-75 | |
| GOST 8965-75 | |
| GOST 8966-75 | |
| GOST 10006-80 | |
| GOST 10692-80 | |
| GOST 11358-89 | |
| GOST 18242-72 | |
| GOST 18360 -9 3 |
6. Validity restrictions were removed by Gosstandart Decree dated November 12, 1991 No. 1726
7. Reissue 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)
Pipes of the VGP category are a group of water and gas pipes made of steel. Moreover, there are galvanized and non-galvanized options. The pipes are hollow, cylindrical in shape, with a longitudinal weld.
The category has three wall thickness options - thick-walled, medium and thin-walled. An assortment of this nature makes it possible to use pipes that are specifically suitable for this project in which they are used.
The name speaks for itself - a pipe of this type can be used in both water supply systems, and in pipelines carrying gas. In principle, a VGP pipe is considered universal option for many applications.
Standard pipes have segment lengths 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 of use.
Typically, a VGP pipe has three strength categories:
Although such pipes are heavier than non-galvanized ones, by about 3%, the coating gives excellent results when liquids pass through the pipeline. 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 weld.
- Pipes of this type have three categories convenient for the consumer - light, reinforced and ordinary. This allows you to select the appropriate option for perfect design highways.
- The threads on the ends of the pipes can be long, short, or applied, depending on the customer’s wishes, on 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 sold undergo mandatory hydro-vortex control, so compliance with the standards can be considered almost perfect.
- Low cost with excellent product quality is a guarantee of the assigned standards and regulations.
- Versatility in use. Pipes the right type ideal for installation and repair work almost any category.
- A huge range of types of pipes - from hot-rolled seamless, to cold-rolled and electric-welded options.
- Availability of component elements - flanges, couplings, tees, bends, transitions, etc., as well as the possibility of their easy use in installation work.
As you understand, standard VGP pipes GOST 3262 75 have wide range 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 main line, with a rich selection of pipe types for its installation.
GOST 3262-75 is a regulatory document in accordance with which steel water and gas pipes are produced. Using pipes that, unlike plastic products, can be successfully operated in open areas, and carry out installation of pipelines for transporting liquid and gaseous media. Such steel pipes are practically irreplaceable in the field of capital and private construction, housing and communal services, and agriculture.
VGP steel pipes
Water and gas steel pipes, the parameters of which are determined by GOST 3262-75, belong to products for special purposes, as their name suggests. The differences between their types lie primarily in the method of production. However, no matter what type the steel pipes of the category under consideration belong to, all their parameters are stipulated by the provisions of a document such as GOST 3262 (75, 80, 85, 91).
So, according to this standard (3262-75, latest edition 91st year), water and gas pipes made by welding can belong to one of the following types:
Each type of steel pipe is produced using a specific technology
The main areas of application of water and gas pipes, the geometric parameters and technical characteristics of which comply with standard 3262-75, are construction and repair. Pipes of this category are used for arranging gas and water communications and heating systems in cottages and buildings apartment type, administrative buildings, educational institutions, agricultural, industrial and any other facilities.
So, this type of rolled metal is used in:
GOST 3262 (75, 80, 85, 91) assumes that VGP welded pipes can be produced in dimensional, multiple dimensional and unmeasured lengths. So, according to this gradation, they have the following dimensions (according to the length of the manufactured products):
The standard length of pipes produced according to GOST is limited to 12 meters
Wall size is the criterion by which water and gas pipes are distinguished:
Reinforced VGP pipes are products (sometimes galvanized), the wall thickness of which is increased (accordingly, such products have more weight). They are used for installation of pipelines through which liquid or gaseous media are transported under high pressure.
If the technical characteristics and basic geometric parameters of water and gas pipes are regulated by a regulatory document, then their variant design and the cutting length is determined by the customer. Thus, the most popular are pipes whose ends are threaded during the production process. The reason for their high popularity is that they do not require welding to install them.
The use of pipes with ready-made threads significantly reduces the installation time for communications
Threads on VGP pipes can be created during their production:
The thread on VGP pipes is cut or rolled at the request of the customer, and it can be either short or long.
When calculating the weight of water and gas pipes, it should be borne in mind that galvanized products weigh 3% more than those made of ferrous metal. The standard also imposes a limitation on deviations in batch weight: they should not exceed 8%.
An assortment of pipes of each type is formed, which lists their geometric parameters and theoretical weight.
Pipes are manufactured according to size and weight
The steel from which pipes of the VGP category are made must also meet the requirements specified in GOST (380, 1050), while the mechanical properties, as well as the chemical composition of the manufacturing material, are not standardized. Each type of pipe (welded, ferrous metal, galvanized, threaded) requires special technical requirements, which should be discussed in more detail.
In accordance with the provisions of GOST, the following requirements are imposed on welded-type pipes of the VGP category.
Straight seam welded pipes are produced by folding the sheet and then welding the side edges
Water and gas pipes, the threads at the ends of which are cut or rolled by the manufacturer, must have the following parameters.
Thread requirements according to GOST
VGP galvanized pipes
Pipes are checked for compliance with GOST selectively - at least two products from each batch are examined
The regulatory document also stipulates the control methods to which all pipes of the water and gas category must be subjected:
Ordinary and light type - 25 kgf/cm2 (2.4 MPa);
Reinforced - 32 kgf/cm2 (3.1 MPa);
Meeting special requirements - 50 kgf/cm2 (4.9 MPa).
– 2.5 outer diameter sizes – products with diameter up to 40 mm;
– 3.5 outer diameter sizes – pipes with DN 50 mm.
– 15–50 mm – not less than 7%;
By marking water and gas pipes, which must also comply with GOST, you can find out almost all necessary information about the product: geometric dimensions, manufacturing and processing methods, quality of manufacturing materials. At the end of the marking, the number of the regulatory document in accordance with which the product was manufactured must be indicated.
Examples of symbols
Special requirements for the packaging of VGP pipes are imposed only if their outer diameter is from 6 to 20 mm. Such pipes, upon specific instructions from the customer, can be packaged in coils.
Depending on the type of water and gas pipes, their storage conditions may be as follows.
GOST 3262-75 Steel water and gas pipes: dimensions, characteristics
STATE STANDARD OF THE USSR UNION
STEEL WATER AND GAS PIPES GOST
Specifications 3262-75
Water-supply and gas-supply steel pipes
Date of introduction 01.01.77
At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.
b) of unmeasured length.
Pipe wall thickness
Weight of 1 m of pipes, kg
Weight of 1 m of pipes, kg
Steel water and gas pipes technical specifications GOST 3262-75 - Document - page
Specifications Water-supply and gas-supply Specifications
Date of introduction: 01.01.77
This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled 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, Amendment No. 2, 3, 5).
1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.
At the consumer's request, light series pipes intended for thread rolling are manufactured 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 length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;
b) of 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 unmeasured pipes.
(Changed edition, Amendment No. 3, 4).
1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.
2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones.
(Changed edition, Amendment No. 1, 3)
1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.
1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.
2. Pipes of standard manufacturing precision are used for water supply, gas pipelines and heating systems. Pipes with increased manufacturing precision 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, maximum deviations in mass should not exceed:
7.5% – for the party;
10% – for a separate pipe.
(Changed edition, Amendment No. 2, 5).
1.5. The curvature of pipes per 1 m 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. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.
1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.
Examples of symbols
An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:
The same, measured length, with thread:
Pipe R-20×2.8 – 4000 GOST 3262-75
The same, with zinc coating, of unmeasured length, with thread:
The same, with zinc coating, custom length, with thread:
Pipe Ts-R-20×2.8 – 4000 GOST 3262-75
For pipes for rolling threads, the letter N is indicated in the symbol after the word “pipe”.
For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.
For pipes with increased manufacturing precision, the letter P is indicated in the symbol after the size of the nominal bore.
(Changed edition, Amendment No. 1).
2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in the prescribed manner, from steels in accordance with GOST 380-88 and GOST 1050-88 without standardization of mechanical properties and chemical composition.
Pipes for parts of water supply and gas pipeline 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 1–3 mm wide should be left.
At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.
2.1; 2.2. (Changed edition, Amendment No. 3, 4).
2.3. At the consumer's request, pipes are equipped with couplings manufactured 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.
(Changed edition, Amendment No. 3).
2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.
Delamination is not allowed at the ends of the pipes.
Individual dents, rippling, scratches, traces of stripping 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 gentle thickening in this place along the inner diameter of no more than 1.0 mm.
(Changed edition, Amendment No. 3, 4).
2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, the burr on the inner surface of the pipe seam must be cut off or flattened, and 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, manufactured by furnace welding and 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 weld area.
(Changed edition, Amendment No. 2, 3, 4, 5, 6).
2.6. The ends of the pipes must be cut at right angles. The bevel of the end is allowed to be no more than 2°. The remaining burrs 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, manufactured by furnace welding.
(Changed edition, Amendment 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, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.
Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.
It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe in accordance with GOST 9.307-89.
(Changed edition, Amendment No. 3, 4).
2.8. Pipes must withstand 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, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)
(Changed edition, Amendment 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 outer diameters, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 outer diameters.
At the request of the consumer, pipes must withstand the distribution test:
for pipes with a nominal bore from 15 to 50 mm - no less than 7%;
for pipes with a nominal bore of 65 or more - no less than 4%.
At the request of the consumer, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.
(Changed edition, Amendment No. 2, 3, 5).
2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050-88.
2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357-81, accuracy class B.
Pipes with cylindrical threads are used when assembling with seals.
2.10; 2.11. (Changed edition, Amendment No. 3, 4).
2.12. At 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 torn (for cut) or incomplete (for rolled) 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%.
(Changed edition, Amendment No. 2, 3, 5).
2.13. On a thread, it is allowed to reduce the useful length of the thread (without running) up to 15% compared to that indicated in the table. 4, and at the consumer’s request up to 10%.
(Changed edition, Amendment No. 2, 3, 5).
2.14. Threading on galvanized pipes is carried out after galvanizing.
2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.
(Changed edition, Amendment No. 5).
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.
4.1. For quality control, one sample is cut from each selected pipe for each type of test.
The tensile test is carried out according to GOST 10006-80. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.
4.2. The surface of the pipes is inspected visually.
4.3. Hydraulic testing is carried out in accordance with GOST 3845-75 with exposure under test pressure for at least 5 s.
4.4. The bend test is carried out according to GOST 3728-78. Galvanized pipes are tested before coating.
(Changed edition, Amendment No. 3).
4.4a. The expansion test is carried out according to GOST 8694-75 on a conical mandrel with a cone angle of 6°.
It is permissible to test on a mandrel with a taper angle of 30°.
(Changed edition, Amendment No. 3, 4).
4.4b. The flattening test is carried out according to GOST 8695-75.
(Changed edition, Amendment No. 3).
4.4v. Weld inspection is carried out using non-destructive methods according to regulatory 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 according to 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 using thread ring gauges in accordance with GOST 2533-88 (third accuracy class).
In this case, the screw-in of the no-go ring gauge onto the thread should be no more than three turns.
(Changed edition, Amendment No. 3, 4).
4.7. The curvature of the pipes is controlled using a straight edge in accordance with GOST 8026-92 and a set of probes in accordance with TU 2-034-225-87.
(Changed edition, Amendment No. 3, 5).
4.8. The right angle of the pipe ends is controlled with a 90° square measuring 160x100 mm, class 3 GOST 3749-77, plate probes set 4 TU 2-034-225-87 or an inclinometer GOST 5378-88. The bevel angle of the chamfer is controlled with a protractor according to GOST 5378-88.
(Changed edition, Amendment No. 3, 6).
4.9. The outer diameter is checked using smooth micrometers in accordance with GOST 6507-90, clamp gauges in accordance with GOST 2216-84 or GOST 18360-93.
The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358-89 at both ends of the pipe.
The length of the pipes is measured with a tape measure according to GOST 7502-98. Threads are controlled with gauges in accordance with GOST 2533-88.
The mass of a batch of pipes is controlled on scales of no more than 10 tons with a division value of no more than 20 kg.
(Changed edition, Amendment No. 3, 4, 5, 6).
4.10. Weld inspection is carried out using non-destructive methods according to technical documentation.
(Introduced additionally, Amendment No. 4).
5.1. Labeling, packaging, transportation and storage are carried out in accordance with GOST 10692-80 with addition.
5.1.1. Pipe threads must be protected from mechanical damage and corrosion by lubricant according to the regulatory and technical documentation.
Sec. 5. (Changed edition, Amendment No. 3).
1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy
V. I. Struzhok, Ph.D. tech. sciences, V. M. Vorona, Ph.D. tech. sciences, Yu. M. Mironov, Ph.D. tech. nook, A. I. Postolova
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated 09.11.75 No. 2379
3. Inspection frequency 5 years
4. INSTEAD GOST 3262-62
5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
6. Reissue (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)
Related articles:
Water and gas pipes belong to the class of steel pipes for special purposes. Products are distinguished by manufacturing method. Dimensions and ratios are determined by GOST standards. Also, based on the needs of customers, pipes with or without threads are determined.
Welded steel products according to GOST 3262-75 are:
Water and gas pipeline (WGP) products are used in the construction of industrial buildings, residential apartment buildings and private houses, administrative buildings, educational institutions and other objects.
VGP pipes are used:
Steel welded products are cut to length within 4-12 m. Pipe footage according to GOST can be:
Water and gas pipes are conventionally divided into groups according to wall parameters:
The ratio of sizes and weights of products are different and depend on the diameter, wall thickness, steel grade, and method of processing the material (galvanized, non-galvanized).
| Conditional diameter dу (mm) | Side/wall thickness – S (mm) | Outer diameter – dH (mm) | Weight (1 m in kg) | Number of meters per ton Nt |
| 6 | 1,8 | 10,2 | 0,37 | 2682 |
| 8 | 2,0 | 13,5 | 0,57 | 1763 |
| 10 | 2,0 | 17,0 | 0,74 | 1352 |
| 15 | 2,35 | 21,3 | 1,10 | 910,5 |
| 15 | 2,5 | 21,3 | 1,16 | 862,7 |
| 20 | 2,35 | 26,8 | 1,42 | 705,7 |
| 20 | 2,5 | 26,8 | 1,50 | 667,5 |
| 25 | 2,8 | 33,5 | 2,12 | 471,7 |
| 32 | 2,8 | 42,3 | 2,73 | 366,6 |
| 40 | 3,0 | 48,0 | 3,33 | 300,4 |
| 50 | 3,0 | 60,0 | 4,22 | 237,1 |
| 65 | 3,2 | 75,5 | 5,71 | 175,3 |
| 80 | 3,5 | 88,5 | 7,34 | 136,3 |
| 90 | 3,5 | 101,3 | 8,44 | 118,5 |
| 100 | 4,0 | 114,0 | 10,85 | 92,16 |
| 125 | 4,0 | 140,0 | 13,42 | 74,54 |
| 150 | 4,0 | 165,0 | 15,88 | 62,96 |
| dу (mm) | S (mm) | dH (mm) | Weight (1 m in kg) | Nt |
| 6 | 2,0 | 10,2 | 0,40 | 2473 |
| 8 | 2,2 | 13,5 | 0,61 | 1631 |
| 10 | 2,2 | 17,0 | 0,80 | 1245 |
| 15 | - | 21,3 | - | - |
| 15 | 2,8 | 21,3 | 1,28 | 782 |
| 20 | - | 26,8 | - | - |
| 20 | 2,8 | 26,8 | 1,66 | 603,4 |
| 25 | 3,2 | 33,5 | 2,39 | 418,2 |
| 32 | 3,2 | 42,3 | 3,09 | 324,1 |
| 40 | 3,5 | 48,0 | 3,84 | 260,4 |
| 50 | 3,5 | 60,0 | 4,88 | 205,1 |
| 65 | 4,0 | 75,5 | 7,05 | 141,8 |
| 80 | 4,0 | 88,5 | 8,34 | 120,0 |
| 90 | 4,0 | 101,3 | 9,60 | 104,2 |
| 100 | 4,5 | 114,0 | 12,15 | 82,29 |
| 125 | 4,5 | 140,0 | 15,04 | 66,50 |
| 150 | 4,5 | 165,0 | 17,81 | 56,14 |
Reinforced pipes are distinguished by increased wall thickness and, accordingly, greater weight per linear meter. Such products are used for water supply and gas transportation under high pressure.
| 6 | 2,5 | 10,2 | 0,47 | 2106 |
| 8 | 2,8 | 13,5 | 0,74 | 1353 |
| 10 | 2,8 | 17,0 | 0,98 | 1020 |
| 15 | - | 21,3 | - | - |
| 15 | 3,2 | 21,3 | 1,43 | 700,1 |
| 20 | - | 26,8 | - | - |
| 20 | 3,2 | 26,8 | 1,86 | 536,9 |
| 25 | 4,0 | 33,5 | 2,91 | 343,6 |
| 32 | 4,0 | 42,3 | 3,78 | 264,7 |
| 40 | 4,0 | 48,0 | 4,34 | 230,4 |
| 50 | 4,5 | 60,0 | 6,16 | 162,4 |
| 65 | 4,5 | 75,5 | 7,88 | 126,9 |
| 80 | 4,5 | 88,5 | 9,32 | 107,3 |
| 90 | 4,5 | 101,3 | 10,74 | 93,03 |
| 100 | 5,0 | 114,0 | 13,44 | 74,41 |
| 125 | 5,5 | 140,0 | 18,24 | 54,81 |
| 150 | 5,5 | 165,0 | 21,63 | 46,22 |
Factories produce steel pipes according to customer orders. Therefore, dimensions: length, diameter, wall thickness, design may be different. Pipes with cut threads are in great demand. The products have a high price, but on the other hand, they are adapted for easy installation no welding.
The thread is determined by the method of execution:
The thread is provided both long and short. The following requirements apply to it (Table 5).
| dу (mm) | Size before run-off (mm) | Number of threads per pass | |
|---|---|---|---|
| short | long | ||
| 6 | - | - | - |
| 8 | - | - | - |
| 10 | - | - | - |
| 15 | 9,0 | 14 | 14 |
| 20 | 10,5 | 16 | 14 |
| 25 | 11,0 | 18 | 11 |
| 32 | 13,0 | 20 | 11 |
| 40 | 15,0 | 22 | 11 |
| 50 | 17,0 | 24 | 11 |
| 65 | 19,5 | 27 | 11 |
| 80 | 20,0 | 30 | 11 |
| 90 | 26,0 | 33 | 11 |
| 100 | 30,0 | 36 | 11 |
| 125 | 33,0 | 38 | 11 |
| 150 | 36,0 | 42 | - |
Note that the listed types of pipes (reinforced, light, ordinary) after galvanizing become 3% heavier than products made of ferrous metal. But the maximum mass deviation parameter should not exceed more than 8% (for a batch - 10%) according to GOST.
Gas supply pipes are manufactured exclusively in accordance with the above standards. The materials used for the products are established by GOST 380 and 1050. This steel excludes mechanical and chemical impurities. Requirements for steel gas pipes are characterized according to the following principles: welded, threaded, galvanized, black.
Requirements and tolerances according to GOST for welded steel pipes:
Tolerances and requirements for threaded steel products:
Requirements for galvanized steel pipes:
Requirements for non-galvanized steel pipes:
The durability of gas pipelines is checked according to the following indicators:
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:
Note:
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:
What pipes do you use for gas or water supply? How do you transport, pack or store pipes? Leave it in the comments Interesting Facts and useful information.
