Types and diameters of metal pipes. Large diameter metal pipes
The steel pipe is cylindricalThe tube is the most used product in the steel industry. The main use of steel pipes is to transport oil, gas and water over long distances. In household appliances, for example, refrigerators, use conventional steel pipes, as well as in heating and water supply systems. Steel pipes are available in a variety of sizes and can also be used for structural requirements (hand rails and pipe pins).
Metal pipes are distinguished by the most basicparameter - their diameter. Correctly to calculate transportation through a pipe of this or that liquid it is possible, only knowing a thickness of walls of a pipe and its diameter. Masters often rely on time and experience-tested calculations in their work. The standard diameters of metal pipes are very helpful when choosing the installation option for a particular pipeline.
Before proceeding with the classification of pipes according todiameter and direct purpose associated with this parameter, it is necessary to find out what characteristics are in the pipe. They are needed in the calculations of the system, which will be built from pipes, its throughput and to maintain efficiency at loads.
Types of diameters
There are several types of pipe diameters:
- A conditional is a diameter determined by the inner wall, counted in millimeters, sometimes rounded in inches.
- Outer.On this basis, the pipes are classified into small, medium and large pipes, and sizes from 102 mm to 426 mm and above. A metal pipe with a diameter of 50 mm, according to this classification, refers to small pipes.
- Interior. This parameter is very important for butt joints, so-called fittings.
- The thickness of the pipe wall is not the most important, but indispensable indicator for any calculations.
Metal pipes of large diameters are now ingreat competition with plastic counterparts. They are also available in different diameters, but manufacturers are trying to adhere to existing standards so that it is possible to dock the systems without additional efforts.
Unit of measurement of diameter
Ordinary consumer is hardly immediately orientedin the classification and marking of pipes not only of metal, but also of plastic. If you can decide on the outer or inner diameter, it's more difficult with its size. If it is specified in millimeters, then everything is simple, but with inches it is not immediately clear. Professionals are used to saying that the designation comes with such a symbol "", it is indicated after the numbers, often inches are defined with fractions, but one must get used to this. Translate the diameter of metal pipes in centimeters is not so difficult, just multiply the desired figure by 2.54. If the figure is not a whole, then it is customary to round it.
Measure the diameters of the metal pipes should beyourself. At purchase this parameter can be looked at marking, but there are cases when it is necessary to measure already established communications in order to make their partial replacement. To do this, you need the following information.
Find the diameter of the pipe - it is elementary, you need onlyonly to measure it. This does not require special instruments and instruments, enough tape measure or tape. She needs to wrap the pipe and record the result, then make the usual calculation: multiply the number obtained by Pi, that is, its value is 3.1415. For example, if after measurement it turned out 4 cm, multiplying by Pi, we get 12.56 mm.
You can find out the inside diameter yourself,for this you need to know the thickness of the pipe wall. If there is a cut, then it's easy: just attach a ruler with a millimeter value to the end and write down the result. Any received data is multiplied by two, and then subtracted from the outer diameter, which you will find earlier. Masters often have a caliper at their fingertips: you need to attach it to the pipe and see the result on the scale.
Metallurgical enterprises make pipesvarious purposes, large diameters, which are used in various fields of activity. For example, in heating plants, industry and shipbuilding, as well as in road construction, for sewerage and drainage systems, bridge construction. There are pipes with a very large diameter, which are used in a specific direction, for example, when transporting gas or oil products, as well as in channeling rivers during construction.
Diameters of metal pipes are important to consider whenconstruction, especially if they are large. The length of the pipeline depends on this parameter. Despite the purpose of the pipe, it must be covered with corrosion-reducing compounds. Large pipe systems are difficult to install and operate, all because they are difficult to bend, turning areas require careful welding and calculation. Underground with such structures it is difficult to work and troubleshoot problems that arise during the operation.
Pipes of large diameter according to GOST have differentthe magnitude of the deviation, rather than a pipe of smaller diameter. For example, if the wall thickness is up to 12 mm, then the fluctuation in the value can be up to 0.8 both in the large and the smaller side. Large lots of such pipes indicate the total weight, so there may be significant discrepancies in the documents and the actual wall thickness, if it is checked directly on the site.
Metal pipes, diameters and the price of which are highly dependent on each other, differ in value:
- pipe steel profile square from 40 rubles per running meter - up to 5697 rubles (all depends on the diameter and thickness of the wall);
- pipe rectangular profile from 40 rub. for running meter - up to 611 rubles;
- pipe VGP steel from 73 rubles. per meter - up to 595 rubles.
These are approximate values that may differin different regions. The cost of a profile depends on its purpose, on what steel it is made of, what type of protective coating is applied to the metal pipes. Diameters, price - these are the two parameters that determine the purpose of the pipe, its quality. Different prices exist for wholesale buyers, large companies or individuals. Black and non-galvanized pipes are suitable for the gas pipeline, but galvanized ones are designed for drainage and sanitary ware, with diameters from 50 to 150 mm.
Large diameters of steel pipes in productionrequire compliance with all rules and regulations, so they are subject to quality control. They must withstand significant stresses on bending, squeezing and high pressure.