Casing coupling is for the dimensions range from 4 1/2 inch to 20inch.
• BTC: Buttress coupling
• LTC: Long buttress coupling
• STC: Short buttress coupling
All three types has same thickness of the casing pipe body, just have different lengths.
STC Coupling
API Casing Coupling Short Thread
Forwell provide STC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80,R95,L80,L80-13Cr,C90,T95,C110,P110,Q125.
The round-thread (STC or LTC) casing-joint strength is given as the lesser of the fracture strength of the pin and the jump-out strength.
LTC Coupling
API Casing Coupling Long Thread
We provide LTC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80,R95,L80,L80-13Cr,C90,T95,C110,P110,Q125
The round-thread (STC or LTC) casing-joint strength is given as the lesser of the fracture strength of the pin and the jump-out strength.
BTC Coupling
API Casing Coupling Buttress Thread
We provide BTC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80,R95,L80,L80-13Cr,C90,T95,C110,P110,Q125
The buttress thread casing joint strength is given as the lesser of the fracture strength of the pipe body (the pin) and the coupling (the box).Contact us Skype:Kaden Shi