Artieda 2011

Lack – much greater complexity and fragility of the installation of pipelines. Cast iron pipes are made of cast iron stationary casting sand casting, and centrifugal and semi-continuous casting. The strength of cast iron pipes depends on the thickness of their walls, as well as molding. Pipe fabricated by centrifugal casting and semi, stronger pipes made by casting in sand molds. To protect against corrosion of iron pipes, their outside and inside cover petroleum bitumen. As a result, the inner surface of the pipe becomes more smooth, which reduces the friction of water against the pipe wall.

Cast iron pipes are divided into pressure (water) and sewer. Water pipes made of nonferrous metals. Copper pipes are round, made from copper marks M1, M2 and M3. Copper pipes and cold-drawn produce an outer diameter of 3 to 360 mm, wall thickness from 0,5 to 10 mm, Pressed – diameter from 30 to 280 mm, wall thickness ranging from 5 to 30 mm. The outer and inner surface of the copper pipe should be free of cracks, cavities, bundles of metal.

On the outer surface shall longitudinal risks are small dents, color tint, the curvature of 5 mm to 1 m for extruded pipes and 15 mm at 1 m for extruded. Drawn, cold rolled solid and semisolid tubes after annealing should be tested for flattening in the cold state (three pipe from the party). Brass tubes are made of brass brands: L63 and L68 – and cold-drawn tubes and L60, LS59-1 – pressed. And cold-drawn tubes for special purposes, intended for heat devices, made from brass brands LO70-1, LA77-2 LM68-0, 06. Brass and cold-drawn tubes for general purpose release an external diameter of 3 to 10 mm, wall thickness from 0,5 to 10 mm, and pressed – with outside diameters from 21 to 195 mm, wall thickness from 1,5 to 42 mm. Along the length of such tubes are of uniform and random length from 1 to 6m. And cold-drawn brass tubes produce a length of 10 m and outer diameter of 10 mm and wall thickness up to 1,5 mm. Requirements for quality outer and inner surfaces of brass tubes and their curvature the same as that for copper pipes. Pipes made of aluminum and aluminum alloys are produced by cold rolling (rolled) and cold broaches (pull) and compression. Pipes aluminum and aluminum alloys produce round, rectangular, square and oval. In recent years, began to receive widespread drawn and rolled tube shaped profile. The curvature of the pipe wall thickness up to 5 mm inclusive in diameter and 120 mm shall not exceed 1 m length of 1 3 mm. On the surface of the pipes allowed longitudinal risks of not more than two 10 mm perimeter depth no more than 0.04 mm. The pipe ends must be precisely cut and have burrs. Polymer (plastic) pipes of water supply. Plastic pipes are distinguished strength and elasticity, high corrosion resistance, light weight, low thermal conductivity, smooth inner surface. Hydraulic resistance of fluids in plastic pipes is less than metal, so their capacity is 20-25% higher. In addition, due to the production of long plastic pipes is reduced number of connections in pipelines. Shaped connecting parts made of plastic, used for installation of pipelines, ensures their fast and high quality assembly. Negative properties of plastics pipes – low heat resistance, sensitivity to mechanical damage, addiction, aging, etc.