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Prefabricated piping (piping) consists of pipes and fittings (including elbows, flanges, tees, etc.), and this assembly is done in the factory. The tubes are cut to size and moved to the assembly platform. Temporary assembly welding is performed on the assembly platform, followed by permanent welding.

Pipe pre-positioning and welding is divided into two parts:

1. Rolling positioning and welding.

2. Positioning positioning and welding.

Roll positioning and welding means that the pipe is rolled on the rolling equipment, and the plumber and welder can operate without having to move position. When one or more branch elements on the main pipe exceed the position of the pipeman and welder, the pipeman and welder must move to the position to perform positioning and welding, which is called positioning positioning and welding.

Components of Piping System
The most common components of a piping system are pipes, fittings and valves.
Pipes: Pipes are long cylinders used to carry or transfer fluids. The most common fluids are water, oil, steam, air, milk or finished products like paints, juices. Other uncommon examples include pulp, acids, alkalies, chemicals etc.
Pipe Fittings: Pipe fittings are used to connect lengths of pipes to construct a long piping system; commonly used fittings are flanges, elbows, tees, reducers, expansion bellows etc.
Valves: Valves are used to stop, divert or control fluid flow. Common valve types are gate valves, globe valves, butterfly valves, ball valves, control valves; the selection is based on intended function and application.
In addition, a number of devices like strainers, traps, expansion loops are necessary for keeping the fluid clean and in good condition, and to accommodate expansion/contraction due to temperature variations.

Material for Piping Systems
Piping system may consist of a variety of materials including mild steel, stainless steel, aluminum, brass, copper, glass or plastic. Usually, pipe fittings and valves are made of the same material as the pipe. The material selection as well as pipe sizing depends upon parameters like nature of fluid, pressure, temperature and flow rate.
Carbon steel:
ASTM A53- welded and seamless pipe, black and galvanised.
ASTM A106- Seamless cs pipe for high temperature services.
ASTM A672- Electric fusion welded steel pipe for high pressure service at moderate temperature services.
Stainless steel:
ASTM A312- Seamless and welded steel pipe for low temperature services.
A409-welded large diameter austenitic steel pipe for corrosive and high temperature services.
ASTM A358- Electric fusion welded austenitic chrome -nickel steel pipe for high temperature services.
Low alloy steel:
ASTM A335- Seamless ferritic alloy steel pipe for high temperature services.
ASTM A691- Carbon and alloy steel pipe, electric fusion welded for high pressure service at high temperature.
Low temperature carbon steel:
ASTM A333- Seamless and welded steel pipe for low temperature services.
ASTM A671- Electric fusion welded steel pipe for atmpospheric and low temperature services(sizes >=16in NB)
The plumbing network supplying water at your 香蕉视频 is a common example of a piping system. Other more rigorous examples include steam piping in a power plant, milk piping in a dairy, paint piping in a paint manufacturing plant, oil piping in a refinery, so and so forth.