Everything in this fleeting world has a replacement or continuity, and only for water and gas steel pipes there was no substitute. The indispensability of the steel product lies in the inside of the pipe, and, to be more precise, in the diameter of the conditional transfer. The minimum amount of knowledge on the part of the conditional transfer or designation will allow the interfacing or replacement of pipes. And, mind you, with your own hand.
Content
Pipes steel water-gas conducting
The main product designed for laying water supply and gas supply lines, as well as connecting heating systems, are water and gas (VGP) steel pipes.
Technical conditions for the application and connection of pipes are regulated by GOST 3262-75. The simple technology of manufacturing pipes in an industrial way has expanded the nomenclature of products of pipe metal rolling. The range of most steel pipes in construction is indispensable.
High-tech equipment and metal are used for the production of steel VGP pipes. The production of VGP pipes, denoted by a lower cost than the seamless pipe, determined the mass-use segment. The manufacturing process is subject to multistage control, which determines the high consumer quality of products.
Pipes are safely used in systems that do not function under high pressure. However, the application should be justified by the high cost of steel pipes. By what criteria is it recommended to choose steel pipes and install, given the ratio between metric and inch sizes?
Parameters of steel VGP pipes
Significant starting characteristics are the parameters of the outer diameter of steel pipes and the conditional pass (UP). According to the standard, the nomenclature and assortment of pipes include production by a conditional pass 6-150 mm.
For the selection of steel pipes, you need knowledge of some characteristics, which are recommended to pay attention.
How to choose metal pipes
Selecting pipes for use and creating highways, it is necessary to pay attention to the quantitative parameters: wall thickness, product length, weight and mass, diameter of the conditional transfer. And to buy pipe steel, it is advisable to rely on a reliable seller, such as the Steel-Industrial Company in Rostov-on-Don.
what wall thickness of the VGP pipes
Water and gas pipes are produced in 3 series, defining the range:
- lightweight, with a wall thickness of 1.8 - 4 mm
- conventional, the wall thickness is up to 4.5 mm
- reinforced, with a wall thickness of 2.5 mm.
In addition to the wall thickness parameter, the next parameter for selection is the dimensional and immense appearance of the product.
length of the product
The steel pipe is manufactured in the following lengths:
- dimensional
- immense
- fold-dimensional length, taking into account the allowance on the seam (5mm).
weight and mass
An important characteristic is the weight of VGP pipes. The weight of the steel pipes is determined from the theoretical weight table, which is calculated according to the steel density (7.85 g / cm3). The mass of the VGP tubes is also calculated from the table taking into account the density of the steel. Naturally, no one will do this in the building supermarket. Therefore, for your reference: galvanized steel pipes have a weight of 3% more than non-galvanized.
Helpful Tips
Vodokazoprovodnye pipes supply the consumer with lots. Depending on the volume of the shipment, the total value for sale is adjusted. Naturally, the higher the volume of the delivered product in the batch, the lower the price of a single sample. To buy a steel pipe, it will not hurt to find out the price for the whole lot, indicated at the rate of 1 ton.
A batch consisting of single-dimension pipes and steel grade must be accompanied by a document confirming compliance with the quality standard.
how to make a transition
To make the transition between pipe sizes, inch and metric, is as simple as moving from one metro station to another. Correctly, according to the transition, only in this case it will be the diameter of the conditional transfer.
conditional branch diameter
The diameter of the conditional transfer (DN) demonstrates the capacity of the pipe and prompts the parameters of the connecting parts and valves.
Such a conditional diameter is used solely to determine the cross-section of the flowing fluid or gas. The values of the inner and outer diameters are determined by the formula:
Д (вн.) = Д (нар.) - 2хS,
where S is the wall thickness.
For example, a steel pipe DN40 (11/2 ") has an outside diameter DN = 48.0 mm.
For different wall thicknesses, the inner diameter will differ:
- thickness S = 3.0 mm - D (вн) will be 42.0 mm
- the wall S = 3.5 mm - D (вн) is equal to 41.0 mm
- thickness S = 4,0 mm - D (вн) 40,0 mm.
How to deal with inches and millimeters, the video will tell.
Knowledge of the conditional transition is especially required when replacing steel pipes with polypropylene pipes.
pipe conventions
It is also recommended to pay attention to symbols. For example, this way it will be designated not galvanized pipe of usual accuracy wall thickness 2.8 mm, DN 20 mm without thread and coupling:
Pipe 202.8 GOST 3262-75
When choosing a pipe with a coupling, the designation will look like:
Pipe M-202,8 GOST 3262-75
tube of dimensional length, with thread marked:
Pipe R-202.8 - 4000 GOST 3262-75
VPG tube with zinc coating and thread:
Pipe TS-R-202.8 GOST 3262-75.
Just a few letters that fundamentally change the scope of water and gas pipes.
Helpful Tips
All these acronyms and letters can not be excluded from everyday use. Standards have not been canceled yet. Therefore it is necessary to remember:
"M" is a coupling,
"P" - thread,
for rolling pipes after the "pipe" will be indicated "H"
for the long threaded part, after the "pipe" is indicated "D".
In addition to the parameters and technical characteristics, the water and gas pipes must meet the technical requirements, namely, to withstand hydraulic pressure:
- light and ordinary VGP pipes - 2.4 MPa (25 kgf / cm2)
- reinforced - 3.1 MPa (32 kgf / cm2).
and the ability to bend the pipe for use.
And now about the main thing, what pipes (VGP) for what they use and how to produce their flaring or folding, the video will help.
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