TUBING AND CASING COUPLING

Product introduction

Keywords:Casing and Tubing Coupling, Casing Coupling, Tubing Coupling
Type:API 5CT Tubing Couplings, API 5CT Casing Couplings
Size:Tubing Coupling : 1.9'' - 4-1/2'',Casing Couping : 4-1/2'' - 13-3/8''
Thread Type:NUE/EUE/STC/LTC/BTC
Grade:J55, L80, N80 & P110
Standard:API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT and 5B L80-1,C90, C95,T95, P110, Q125
Surface Treatment :phosphating treatment
Color Code:J55 Green,L80 Red with brown strips,N80 Red with green strips,P110 White

Description
Casing coupling is a short pipe applied in connecting two casing pipes which have threads. The 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 casing couplings are manufactured in accordance with API 5CT specification of the latest edition.

Properties of Casing Couplings:
♦ 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 127mm to 365.12 mm;
♦ The casing couplings thread patterns include short round thread, long round thread and buttress thread.
Tubing coupling is a kind of drilling tool available in oil field. Tubing couplings are mainly used in connecting oil pipes. This type of pipe coupling has handled the problem that the existing couplings tend to crack because of stress concentration. The oil pipe ends and the inner wall of the tubing coupling are connected by threads. And the oil pipes and the ends of the tubing 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.

Properties of Tubing Coupling:
♦ The material of tubing couplings is H40, J55, N80-1, N80Q, L80, C90, T95 and P110 grade steel with high quality and good performance;
♦ It is mainly used to connect two oil pipes;
♦ The tubing coupling thread patterns include non-upset thread and upset thread;
♦ The outer diameter of tubing coupling ranges from 55.88 mm to 141.3 mm;

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

Technical DATA

API Tubing Coupling
Descriptions and size		Type of Thread	O.D*L	Weight
Descriptions and size		Type of Thread	(mm)	(kg)
Tubing Coupling	1.05	NUE	33.35*80.96	0.23
	1.05	EUE	42.16*82.55	0.38
	1.315	NUE	42.16*82.55	0.38
	1.315	EUE	48.26*88.90	0.57
	1.66	NUE	52.17*88.90	0.59
	1.66	EUE	58.88*95.25	0.68
	1.9	NUE	55.88*95.25	0.56
	1.9	EUE	63.50*98.42	0.84
	2-3/8″	NUE	73.02*107.95	1.28
	2-3/8″	EUE	77.80*132.82	1.55
	2-7/8″	NUE	88.90*130.18	2.34
	2-7/8″	EUE	93.17*133.35	2.4
	3-1/2″	NUE	107.95*142.88	3.71
	3-1/2″	EUE	114.30*146.05	4.1
	4″	NUE	120.65*146.05	4.35
	4″	EUE	127.00*152.40	4.82
	4-1/2″	NUE	132.08*155.58	4.89
	4-1/2″	EUE	141.30*158.75	6.05

API Casing Coupling
Descriptions and size		Type of Thread	O.D*L	Weight
Descriptions and size		Type of Thread	(mm)	(kg)
Casing Coupling	4-1/2″	STC	127.00*158.75	5.23
	4-1/2″	LTC	127.00*177.80	4.15
	4-1/2″	BTC	127.00*225.42	4.55
	5″	STC	141.30*165.10	4.66
	5″	LTC	141.30*196.85	5.75
	5″	BTC	141.30*231.78	5.85
	5-1/2″	STC	153.67*171.45	5.23
	5-1/2″	LTC	153.67*203.20	6.42
	5-1/2″	BTC	153.67*234.95	6.36
	6-5/8″	STC	187.71*184.15	9.12
	6-5/8″	LTC	187.71*222.25	11.34
	6-5/8″	BTC	187.71*244.48	11.01
	7″	STC	194.46*184.15	8.39
	7″	LTC	194.46*228.60	10.83
	7″	BTC	194.46*254.00	10.54
	7-5/8″	STC	215.90*190.50	12.3
	7-5/8″	LTC	215.90*234.95	15.63
	7-5/8″	BTC	215.90*263.52	15.82
	8-5/8″	STC	244.48*196.85	16.23
	8-5/8″	LTC	244.48*254.00	21.67
	8-5/8″	BTC	244.48*269.88	20.86
	9-5/8″	STC	269.88*196.85	18.03
	9-5/8″	LTC	269.88*266.70	25.45
	9-5/8″	BTC	269.88*269.88	23.16
	10-3/4″	STC	298.45*203.20	20.78
	10-3/4″	BTC	298.45*269.88	25.74
	11-3/4′	STC	323.85*203.20	22.64
	11-3/4′	BTC	323.85*269.88	28.03
	13-3/8″	STC	365.12*203.20	25.66
	13-3/8″	BTC	365.12*269.88	31.77
	16″	STC	431.80*228.6	34.91
	16″	BTC	431.80*269.88	40.28
	18-5/8″	STC	508.00*228.60	51.01
	18-5/8″	BTC	508.00*269.88	62.68
	20″	STC	533.40*228.6	43.42
	20″	LTC	533.4*292.10	57.04
	20″	BTC	533.40*269.88	50.1

Standard

Applicable standards:
API 5CT material for body;
API 5B for API threads;
Premium thread per licensor specifications
Main Technical parameters

Couplings	Size in	Max. OD in(mm)		Min length in(mm)		Grade
		NU	EU	NU	EU
	23/8	2.875(73.03)	3.063(77.80)	41/4(107.95)	47/8(123.83)	J55 N80 L80
	27/8	3.500(88.90)	3.668(93.20)	51/8(130.18)	51/4(133.35)
	31/2	4.250(108.00)	4.500(114.30)	55/8(142.88)	53/4(146.05)
Crossovers	J55,N80,L80 All kinds of crossovers, connections and sub-couplings of grades J55, N80 and L80

COUPLING PIPE GRADE IDENTIFICATION BY PAINT COLOR
According to API 5CT standards, Oil casing and Tubing couplings should be painted one by one to distinguish different grades of steel. The color label of the oil casing and Tubing should be sprayed at any end ≥ 600mm, and the color should be painted on the whole outer surface, and then the color ring should be sprayed.

Grade	Grade Type	Colour(s) for Coupling		Number andcolour of bandsfor product
Grade	Grade Type	EntireCoupling	Band(s)	Number andcolour of bandsfor product
H40		None	Same as for pipe	None/black band at the manufacturer’s option
J55 Tubing		Bright Green	None	One Bright Green
J55 Casing		Bright Green	One White	One Bright Green
K55		Bright Green	None	Two Bright Green
M65		M65Pipe uses L80Type 1Couplings		One Bright GreenOne Blue
N80	1	Red	None	One Red
N80	Q	Red	One Green	One RedOne Bright Green
R95		Brown	None	One Brown
L80	1	Red	One Brown	One RedOne Brown
L80	9Cr	None	Two Yellow	One Red,One Brown,Two Yellow
L80	13Cr	None	One Yellow	One Red,One Brown,One Yellow
C90	1	Purple	None	One Purple
T95	1	Silver	None	One Silver
C110		White	Two Brown	One White,Two Brown
P110		White	None	One White
Q125		Orange	None	One Orange