Oil Casing Coupling

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Oil Casing Coupling Description

Casing coupling is for the dimensions more than 4 1/2 inch. Differently than tubing coupling is, casing coupling normally does not need to be thickened (Non-upset), which means no upset casing coupling, so it has following types:

• 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.

The oil casing coupling is a necessary piece used to connect the two casing. The coupling manufacturing method is the same as seamless pipe. The steel pipe ends with internal thread to connect with the upper and lower casing. In order to ensure the joint tightness, the precision of screw thread is strictly required.

Properties of Oil Casing 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 127mm to 365.12 mm;
♦ The casing couplings thread patterns include short round thread, long round thread and buttress thread.

Oil Casing Coupling chemical composition

GRADE	Chemical Composition				Mechanical Property
	C (Max)	Mn (Max)	P (Max)	S (Max)	Tensile		Yield		C. E. IMPACT ENERGY
	C (Max)	Mn (Max)	P (Max)	S (Max)	Psi x 1000	Mpa	Psi x 1000	Mpa	PCM	IIW	J	FT/LB
B	0.22	1.20	0.025	0.015	60 - 110	414 - 758	35 - 65	241 - 448	0.25	0.43	T/L 27/41	T/L 20/30
X42	0.22	1.30	0.025	0.015	60 - 110	414 - 758	42 - 72	290 - 496	0.25	0.43	T/L 27/41	T/L 20/30
X46	0.22	1.40	0.025	0.015	63 - 110	434 - 758	46 - 76	317 - 524	0.25	0.43	T/L 27/41	T/L 20/30
X52	0.22	1.40	0.025	0.015	66 - 110	455 - 758	52 - 77	359 - 531	0.25	0.43	T/L 27/41	T/L 20/30
X56	0.22	1.40	0.025	0.015	71 - 110	490 - 758	56 - 79	386 - 544	0.25	0.43	T/L 27/41	T/L 20/30
X60	0.22	1.40	0.025	0.015	75 - 110	517 - 758	60 - 82	414 - 565	0.25	0.43	T/L 27/41	T/L 20/30
X65	0.22	1.45	0.025	0.015	77 - 110	531 - 758	65 - 82	448 - 565	0.25	0.43	T/L 27/41	T/L 20/30
X70	0.22	1.65	0.025	0.015	82 - 110	565 - 758	70 - 82	483 - 565	0.25	0.43	T/L 27/41	T/L 20/30
X80	0.22	1.90	0.025	0.015	90 - 120	621 - 827	80 - 102	552 - 705	0.25	0.43	T/L 27/41	T/L 20/30

Oil Casing Coupling mechanical property

API 5L Grade	Yield Strength min. (ksi)	Tensile Strength min. (ksi)	Yield to Tensile Ratio (max.)	Elongation min. %1
A	30	48	0.93	28
B	35	60	0.93	23
X42	42	60	0.93	23
X46	46	63	0.93	22
X52	52	66	0.93	21
X56	56	71	0.93	19
X60	60	75	0.93	19
X65	65	77	0.93	18
X70	70	82	0.93	17
X80	80	90	0.93	16

Oil Casing Coupling Specification

Product Name		Tubing casing coupling
Model Numer		1.9"-20"
Certification		API 5CT
Material		Alloy steel
Processing Type		Turning
Surface treatment		Whole phosphating, or inside phosphating and outside coating
Usage		Internally threaded cylinder for joining two lengths of threaded casing pipe
Casing coupling	Specification	API 5CT 4-1/2” to 20”
	Steel grade	J55, K55, L80,N80, P110
	Thread type	STC, LTC, BTC
	Details	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"
Tubing coupling	Specification	API 5CT 1.9”, to 4-1/2”
	Steel grade	J55, L80, N80
	Thread type	EUE, NUE
	Details	1.9", 2-3/8", 2-7/8", 3-1/2", 4", 4-1/2"

Application

Our steel products are mainly used in chemical industry, petrochemical industry, offshore, seawater pipeline, desalination plant, nuclear engineering, paper and pulp industry.

Oil and GasKuwait is a country of petroleum resources with abundant, oil factory also is very broad, respectively, the oil plant are mainly used for refining oil and oil processing.

MarineSubmarine pipelines carry such things as domestic water, waste water, electrical lines, gas lines, communication lines, and outfall or intake systems.

ConstructionBridge materials with high strength, low cost for selecting the main basis, give priority to with development of the traditional steel and concrete.

EnergyEngineering is mainly aiming at the water pollution and solid waste pollution. using the steel pipe to filtrate in order to improve the quality of water.