Thread connection is used below DN100
DN50~DN300 adopts clamp connection
Flange connection is adopted for above DN50
DN100 can use bimetal welding
The connection methods used for buried plastic-coated fire pipes are flange, clamp connection and welding. Among them, welding is the most reliable connection method. Welding can use bimetal and no damage, which can effectively prevent the coating from being damaged after welding. And the phenomenon of pipeline cracking caused by geological subsidence in use.
