Seamless tubing couplings GOST 633-80 strength group D with smooth triangular thread
GOST 633-80 Tubing is used to transport crude oil or natural gas from layer of the oil and natural gas to surface. It has better pressure during oil or gas production and smaller diameters.
GOST 632-80 CASING AND COUPLINGS
Casing to this standard shall be seamless, with round and buttress-type threads (OTTM-type casing), with high-seal thread connection (OTTG-type casing) and respective
couplings; casing type TBO shall be upset-end and without couplings. Depending on the quality level required, asing shall be grades A and B.
Casing grade A. Size range for asing grade A is given in Table 1; casing with short and long round thread, bttresstype thread (OTTM) and upset-end is incuded. Other wall
thicknesses are available on agreement Casing shall have the length 9.5 to 13 meters.
Technical requirements.
The outside surfaces of casing and couplings shall be free of cracks, laps, discontinuities, indusions and other visible defects. Repair of defects by grinding shall leave the wall
thickness within the minimum permissible values. Defects of production origin such as indentations, saratches or scale are permissible if they leave wall thickness within the
tolerances.
Standards: Couplings according to API 5CT, thread according to API Spec 5B GOST 633-80, GOST 632-80
Strength groups:
H40, J55, K-72, N80-1, N80Q, L80-1, L80-13Cr, C95, P110 according to API 5CT, GOST R 53366-2009
D, K, E, L, M, P according to GOST 633-80, GOST 632-80;
Casing thread: STC, LTC, BC;
Tubing thread: EU, NU,IJ;OTTM,OTTG
GOST 633-80 D (Casing and Tubing) = API 5CT H-40
GOST 633-80 D (Casing and Tubing)= API 5CT J-55
GOST 633-80 D (Casing and Tubing) = API 5CT K-55
GOST 633-80 E (Casing and Tubing)= API 5CT N-80
GOST 633-80 E (Casing and Tubing) = API 5CT L-80
GOST 633-80 L (Casing and Tubing)= API 5CT C-90
GOST 633-80 L (Casing and Tubing)= API 5CT C-95
GOST 633-80 M (Casing and Tubing)= API 5CT P-110
