Ordinary steel pipes have threaded connection, welding and flange connection; Seamless steel pipes, non-ferrous metals and stainless steel pipes are mostly welded and flanged; Cast iron pipes mostly adopt socket connection, and a few adopt flange connection; Plastic pipes are mostly connected by means of thread, bonding and hot melting, while other nonmetallic pipes are connected in various forms.
Extended data:
1, threaded connection
There are three ways to connect pipe threads: cylindrical internal thread is inserted into cylindrical external thread, cylindrical internal thread is inserted into conical external thread, and conical internal thread is inserted into conical external thread, as shown in the following figure. The latter two methods are closely related and commonly used.
2. Flange connection
Flange connection is to connect two pipes, fittings or equipment. First, fix them on one flange, then add a flange pad between the two flanges, and finally tighten the two flanges with bolts to make them closely combined.
3, welding connection
Welding methods usually include gas welding, manual welding, automatic arc welding and contact welding. Before welding, the pipeline shall be thoroughly cleaned and inspected.
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