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Outdoor heating and heat pipe pipe should have high temperature, high pressure, easy to operate welding, smooth wall and other properties.

High-pressure steam pipe should be used seamless steel pipe; high temperature and high pressure hot water heating pipe and more use of seamless steel pipe, general hot water heating pipe can be welded steel pipe.

System elbow should be used to press the steel elbow, three-way tube with saddle-shaped hole on the hole, the hole height should not be less than 1/2 of the diameter.

Pipeline welding requirements:

    1.Welders should be held by the pressure vessel welding certificate welding, non-welder workers are prohibited welding.
    2.For high temperature and high pressure steam or hot water pipes in the construction before the welders should do welding specimens, the weld mechanical strength test and non-destructive testing, qualified before construction.
    3.When the diameter of the pipe is welded, the wall thickness difference should not be greater than 3, the pipe diameter should be used to reduce the diameter of the pipe,
    4.Pipes larger than DN40 must be opened before welding to ensure that the pipe wall is fully fused and welded during the welding process to enhance the mechanical strength of the weld.
    5.Bevel molding can be used for gas welding or beveling machine processing, cutting processing should be timely removal of slag and iron oxide, and then file or grinder repair mouth.
    6.Weld width should be uniform, no slag pores, beautiful weld, according to the wall thickness of the bottom cover welding. Should not be a molding, the gap should be consistent with regulatory requirements to ensure that the penetration of the wall.
    7.Welders should be based on diameter, pipe wall to adjust the welder current. If the current is too large, it may break through the pipe wall. The current is too small to melt the pipe wall and reduce the mechanical strength.
    8.The electrode should be the same material as the base metal, the pipe for the heating system is mostly low carbon steel pipe, the choice of electrode for the Qin calcium type (acid electrode), for welding welding machine.
    9.When the weld defects, should be amended. Severe need to cut the pipe section of the weld, re-welding.