Casing Coupling
Features
- High precision in size and shape
- Good corrosion resistance
- High collapse strength
- Excellent comprehensive mechanical properties
- High connection strength and sealability
- Constant mechanical properties at high temperature
Specifications
- API Spec 5CT Specification for Casing and Tubing
- API Spec 5B Specification for Threading, Gauging, and thread Inspection of Casing, Tubing, and Line Pipe Thread
- Other manufactures’ specifications higher than API Spec
| Products | Pipe type | Steel grade | Outside diameter mm (in) | Wall thickness mm (in) | Thread type | Production capacity ton/year |
| Casing and Coupling | Seamless Pipe | J55, K55, M65, L80, N80, C90, C95, Pl10 | 114.3-508.0 (4-1/2-20) | 5.2-16.13 (0.22-0.635) | PSLBE② | 2, 250, 000 |
| TP65H, TP80S, TP80SS, TP80T, TP80TS, TP80CQJ, TP90S, TP90SS, TP90, TP90H, TP95S, TP95SS, TP95T, TP95TS, TP95TT, TP100, TP100H, TP110T, TP110TT, TP110CQJ, TP125TT① | 114.3-339.7 (4-1/2-13-3/8) | 5.2-15.88 (0.22-0.625) | PSLB TP-CQ③ | 200, 000 | ||
| ERW Pipe | J55, K55 | 139.7-508.0 (5-1/2-20) | 5.87-13.84 (0.23-0.545) | PSLB | 500, 000 | |
| Tubing and Coupling | Seamless Pipe | J55, L80, N80, C90, Pll0, BG-80SS④ | 48.26-114.3 (1.90-4-1/2) | 3.68-9.52 (0.145-0.375) | PNU⑤ BGT BGT-1⑥ | 930, 000 |
Notes:①H=high temperature casing, S=sour service casing, SS=special sour service casing, T=high collapse casing, TS=sour service & high collapse casing, TT=special high collapse casing,CQJ=high fatigue strength casing, TP=a code name of non API series;
②P=plain end, S=short round thread, L=long round thread, B=buttress thread, E=extreme-line;
③TP-CQ=premium thread connection of TP series;
④BG-80SS=special sour service tubing of BG series, BG= a code name of non API series;
⑤P=plain end, N=non-upset thread and coupled, U=external upset thread and coupled;
⑥BGT, BGT-1= premium thread connection of BG series.
The Process Flowchart of Coupling
