If specified in the contract, the core pipe coupling 89, coupling, shall provide special clearance (reduced outer diameter Wc) coupling for the pillar (BTC connection) casing and external upset (EUE connection) pipe. Unless otherwise specified, upset pipe joints with special clearances shall have a special bevel at both ends. The inner and outer edges of the bearing surface should be rounded or chamfered. The end (or bevel) of the coupling shall be at right angles to the axis.
Bushing coupling thread: Partial trapezoidal thread (BTC), long round thread (LC), short round thread (STC), other special buckle threads for air tight buckle VAM TOP, HYDRIL CS, VAGT, etc. 5CT 10th, API SPEC 5B, ISO 11960
Casing coupling use: Petroleum casing coupling is a connection accessory used to connect petroleum casing and other drilling and production equipment
Casing coupling model: 5-1 / 2 '; 6-5 / 8'; 7 '; 8-5 / 8'; 9-5 / 8 '; 13-3 / 8'; 16 '; 20' etc.
Casing coupling steel grade material: J55 / K55 / N80 / L80 / P110 / Q125 / 1CR / 3CR / 9CR / 13CR / Super13CR