Advantages and disadvantages of steel pipes
designing a system of water supply and heating, the home owner will necessarily solve the problem, choose any of the pipe.In addition to traditionally used steel pipes, the construction market today offers pipes made of copper, polymers and metal plastic.No doubt, new technologies and materials have their advantages, but many people choose steel pipes, and for good reason.
First, of course, is their strength, reliability and durability.They are resistant not only to the high operating pressure, which is characte
ristic for the Russian centralized water supply systems and heating systems, but also part of his swings and waterhammer.Temperature coefficient of linear expansion of steel is low, so the hot water passing through the pipes thus, does not deform them, they do not change their linear dimensions.An additional advantage is the low cost of steel pipes.
But, like any other material, they also have their drawbacks.The steel is subject to corrosion that the low quality of process water used in the centralized water supply systems and heating causes shorten the life of the pipeline.Furthermore, the inner diameter of the tube eventually clogs various sediments, most notably at the folds, the capacity of the steel pipe is reduced as a result.He needs constant cleaning, repair, inspection and prevention.Steel is a conductor, and the cause of corrosion are stray currents arising during operation.The high thermal conductivity of steel making mandatory the outer insulation, and in some cases and the inside of the pipelines.And, moreover, installation work is performed by welding, that requires the presence of a professional, special equipment and increases the cost of operation. considerably complicates the process of installation of steel pipes need for threading, because the system provides a large number of connections with couplings, tees, angles.
What are the steel tubes can be used in water and heating systems
If you still chose steel pipes, make sure that the quality is high enough and meet the requirements to be met by the operating conditions.Your selected tube shall be made in accordance with the standards set by GOST 3262-75 for water and gas supply pipes.Nominal diameter of standard tubes - from 6 to 150 mm, wall thickness - 1.8 to 5.5 mm.Depending on this setting, steel pipes are divided into light, ordinary and reinforced, and on how the method can be cut - to "a cutting" and "under the knurled".
length of steel pipe ranges from 1.5 to 12.5 m, at their ends - straight threads.According to GOST they are checked on a test hydraulic pressure, the value of which for light pipes installed in the 2.3 MPa for reinforced - 3,2Mpa.Steel pipes are galvanized, which greatly improves their resistance to corrosion. surface of galvanized steel pipes should be coated without gaps;his blistering not allowed, but the small nodules and roughness normal.
for apartment buildings and industrial applications you can use seamless steel pipe.They are designed to operate at a pressure of 2.5 MPa and temperature to 300 ° C coolant.These pipes are divided into cold and hot deformed.The former have an outer diameter of 5 to 250 mm, a wall thickness of 1.3 to 24 mm and a length of 1.5 to 11.5 m. Second - outer diameter - 25-820 mm, wall thickness - 2,5-75 mmlength - 4-12,5 m.
to supply the country house, where the water, even technical, goes through a purification system and has a good quality, used electric-welded pipes designed for water pressure up to 1.6 MPa and temperature to 300 ° C.
welded steel pipes produced by industry according to the product mix, established by GOST 10704-91.It specifies requirements for their appearance, so when viewed, pay attention to on the surface of the pipe had no sunsets, captured, flaws, and sagging, the more cracks, it should be smooth and even.Only small and minor defects that do not affect the quality and useful life of pipes: dents, nicks, marks stripping.In any case, the wall thickness must not go beyond the permissible negative deviations.
purchasing welded pipe, check the seams, they should be solid, without undercooked areas and fistulas may only gentle thickening of not more than 0.5 mm.Inadmissible any defects that can reduce the quality of welds, because it is at any time can lead to a crash.