GEOG 4891 Lecture Notes - Lecture 3: Polyethylene Terephthalate, Casing String, Office Of Energy Efficiency And Renewable Energy
Document Summary
Physical properties of a coupling, such as outside diameter and the wall thickness must be at least equal to those of the casing sections it joints (table 2. 3). Couplings are also classified in accordance with the lengths of the threads of the casing they are to be used as: Couplings are coupled to the one end of a casing pipe by power tight at a certain torque given by standards. The length of coupled casing pipe (from uncoupled end of the casing pipe to the end of coupling at the other side) is less than the length of casing pipe plus the length of the coupling. Make up loss per joint is calculated by. Lj = 0. 5lc j where (lj) is make up loss per joint, (lc) is length of coupling and j is distance from the end of casing to the center of coupling.
