Groove connection technology, also known as clamp connection technology, because of its advanced technology, quickly accepted by the domestic and foreign markets, has gradually replaced the flange and welding of the two traditional pipe connection. Not only is the technology more mature, the market is also generally recognised, and has been actively guided by national regulations and policies. The application of groove connection technology, so that the complex pipeline connection process has become simple, fast and convenient, so that the pipeline connection technology has taken a big step forward.