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Oilfield Tubular
Casing&Tubing Coupling
Properties of casing&tubing coupling:
The material of casing couplings is h40, j55, k55, m65, n80-1, n80q, l80, c95, t95 and p110 grade steel with high quality and good performance;
The outer diameter ranges from 55.88 mm to 141.3 mm;
The casing couplings thread patterns include short round thread, long round thread and buttress thread.
Application: used for connect 2 joints of tubing or casing
Casing couping:4-1/2'' - 13-3/8''
Pipe standard:
Api 5ct and 5b psl1/psl2 j55,k55,n80-1,n80-q,
Thread: nue, eue,stc, ltc, btc, xc,hydrill cs
Special service: sweet service, sour service, anti-h2s, nace mr0175/iso15156
Standard
Specification
Casing and tubing coupling is a short pipe applied in connecting two casing pipes which have threads. The steel pipe coupling has internal threads machined to match the external thread of the long joints of casing. The two joints of casing pipes are screwed into opposite ends of the casing coupling. Through their strength can be normally made of the same grade of steel as the casing. All API casing couplings are manufactured in accordance with API 5CT specification of the latest edition. The oil pipe ends and the inner wall of the coupling are connected by threads. And the oil pipes and the ends of the coupling have the same type of threads. It is not easy to crack for this type of connection and the connection effect is good. The tubing coupling can avoid the oil well string dropout accident effectively.
API Tubing Coupling:
Specification |
|
Size (Pipe OD) (in) |
1.900, 2-3/8, 2-7/8, 3-1/2, 4, 4-1/2 |
Upset |
Non UpsetExternal Upset |
Grade |
J-55, C-75, L-80, N-80, C-95, P-110 |
Option |
Electro-zinc platedPhosphorised |
API Casing Coupling:
Specification |
|
Size (Pipe OD) (in) |
4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, 8-5/8, 9-5/8, 10-3/4, 11-3/4, 13-3/8, 16, 18-5/8, 20 |
Threading |
Short Round-Thread Casing (STC)Long Round-Thread Casing (LC)Buttress Thread Casing (BC) |
Grade |
H-40, J-55, K-55, C-75, L-80, N-80, C-95, AS-95, P-110, L80-13CR |
Process
lnspection → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic Test → Drift Test → Doping and Protectors Application → Coating → Measurement of Length and Weight → Colour
Identification → Marking → Packing → Warehousing