Piping installation process involves many skills, so in pipe line installation projects, need a large number of various Angle of the bend, such as 90 ° and 45 ° bend, b type bending (curved) back and forth, curved (arc), square expansion, etc., on the basis of the construction site equipment condition and pipe diameter size selection processing machinery and the corresponding construction technology, can be on the scene processing, can also finalize the design production in the factory. Piping need machine: manual pipe bender, pulley pipe bender, electric or hydraulic pipe bending machine, automatic pipe bending machine, hair dryer, mold, steel ruler, oven, table, acetylene generator, hang tools, etc. Pipe bending condition: has the construction drawing, standard drawing, and to review the finished.(meet safety requirements of construction site and the workbench. Has the qualification of pipes and all in the scene. Technical disclosure has, familiar with the machining parts specifications, size, Angle, make good materials. When using a manual pipe bender bending nebula-rich complex, operators face must avoid the bending of steel pipe, so as to avoid pipe bender slippage cuts. Simmer bending, tube mouth no standing, in order to prevent the shot cuts, coal stove position should be good contact with the fire department, confining the tinder must eliminate, before coming off work must be on fire, in case of an accident. Acetylene generator must be equipped with safety device to prevent tempering, insurance chain, oxygen cylinders, oxygen table, and cutting tools are strictly prohibited from grease, oxygen tanks should be shockproof aprons.