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Tubing And Casing Coupling

Keywords: Full Coupling, Half Coupling, Reducing Coupling, Tubing Coupling

Size: Tubing Coupling: 33.35mm * 80.96mm ~ 141.30mm * 158.75mm Casing Coupling: 127mm * 158.75mm ~ 553.4mm * 269.88mm

Standard & Grade: API 5CT / 5B;J 55, K 55, N 80-1, N80 Q, C 90, C 95, T 95, P 110, Q 125

Thread: NUE, EUE, VAM, STC, LTC, BTC, Special Clearance, XC, VAM TOP, NEW VAM

Packing: Protection Caps in Both End, Waterproof Paper Wrapped, Two Tags

Usage: Used for Connecting Two Joints of Oil Tubing / Casing

Connection Types: Socket Weld, Threaded Coupling(NPT & BSP)

Pressure Ratings: 3000#, 6000#, 9000#

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FAQ

Couplings are short lengths of pipe used to connect 2 joints of tubing or casing. They come with painted color codes on their external surface to indicate their grades. Standard:API Spec 5CT and 5B Tread types: NUE, EUE, VAM, STC, LTC, BTC, special clearance, XC,VAM TOP,NEW VAM.

Oil and Gas Couplings are short lengths of pipe used to connect 2 joints of tubing or casing. They come with painted color codes on their external surface to indicate their grades.

oil casing couplings and oil tubing couplings have different thread types.

Standards and Technical Conditions for Supply:API Spec 5CT and 5B

Size: 1.9” --20”

Grade: J55,K55,N80-1,N80Q,L80-1,C90,C95,T95,P110,Q125

Thread types of couplings: NUE, EUE, VAM, STC, LTC, BTC, special clearance, XC,VAM TOP,NEW VAM.

Packing: by carton, wooden case, wooden pallet or customized

Stainless Steel Coupling

ASTM / ASME SA A182 F304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904

Carbon Steel Coupling

ASTM/ ASME A 105, ASTM/ ASME A 350 LF 2

Alloy Steel Coupling

ASTM / ASME A182 F1/ F5/ F9/ F11/ F22/ F91

Nickel Alloy Coupling

ASTM / ASME SB 336 UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276)

Duplex Steel Coupling

ASTM A 182 – F 51, F53, F55 S 31803, S 32205, S 32550, S 32750, S 32760

Steel Pipe Coupling are used to connect two pipes or tubes together by screwed ( threaded) or socket welding. It comes in many shapes and sizes.

Threaded Reducing Couplings

Full Threaded Couplings

Half Threaded Couplings

Size and Specifications For Tubing and Casing Couplings for oil and gas
Descriptions and size		Type of Therad	O.D*L	Weight	Descriptions and size		Type of Therad	O.D*L	Weight
			(mm)	(kg)				(mm)	(kg)
Casing Coupling	4-1/2″	STC	127.00*158.75	5.23	Tubing Coupling	1.05	NUE	33.35*80.96	0.23
	4-1/2″	LTC	127.00*177.80	4.15		1.05	EUE	42.16*82.55	0.38
	4-1/2″	BTC	127.00*225.42	4.55		1.315	NUE	42.16*82.55	0.38
	5″	STC	141.30*165.10	4.66		1.315	EUE	48.26*88.90	0.57
	5″	LTC	141.30*196.85	5.75		1.66	NUE	52.17*88.90	0.59
	5″	BTC	141.30*231.78	5.85		1.66	EUE	58.88*95.25	0.68
	5-1/2″	STC	153.67*171.45	5.23		1.9	NUE	55.88*95.25	0.56
	5-1/2″	LTC	153.67*203.20	6.42		1.9	EUE	63.50*98.42	0.84
	5-1/2″	BTC	153.67*234.95	6.36		2-3/8″	NUE	73.02*107.95	1.28
	6-5/8″	STC	187.71*184.15	9.12		2-3/8″	EUE	77.80*132.82	1.55
	6-5/8″	LTC	187.71*222.25	11.34		2-7/8″	NUE	88.90*130.18	2.34
	6-5/8″	BTC	187.71*244.48	11.01		2-7/8″	EUE	93.17*133.35	2.4
	7″	STC	194.46*184.15	8.39		3-1/2″	NUE	107.95*142.88	3.71
	7″	LTC	194.46*228.60	10.83		3-1/2″	EUE	114.30*146.05	4.1
	7″	BTC	194.46*254.00	10.54		4″	NUE	120.65*146.05	4.35
	7-5/8″	STC	215.90*190.50	12.3		4″	EUE	127.00*152.40	4.82
	7-5/8″	LTC	215.90*234.95	15.63		4-1/2″	NUE	132.08*155.58	4.89
	7-5/8″	BTC	215.90*263.52	15.82		4-1/2″	EUE	141.30*158.75	6.05
	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

API 5CT – Specification for Casing and Tubing

Spec 5CT specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners, and pup joints) and accessories.

Applicable to the following connections in accordance

（1）short round thread casing (STC);

（2）long round thread casing (LC);
（3）buttress thread casing (BC);
（4）extreme-line casing (XC);
（5）non-upset tubing (NU);
（6）external upset tubing (EU);
（7）integral joint tubing (IJ).

This standard specifies the technical delivery conditions for steel pipes (casing, tubing, and pup joints), coupling stock, coupling material, and accessory material and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all grades except H-40, L-80 9Cr, and C110, are contained in Annex H. This standard can also be applied to tubulars with connections not covered by API standards,Not applicable to threading requirements.

API 5B-Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads

API 5B is the standard specification for threading, gauging, and inspection of Casing, Tubing and line pipe threads.

Spec 5B covers dimensions and marking requirements for API Master thread gauges. Additional product threads and thread gauges, as well as instruments and methods for the inspection of threads for line pipe, round thread casing, buttress casing, and extreme-line casing connections, are included. It is applicable when so stipulated in the API standard governing the product. The inspection procedures for measurements of taper, lead, height, and angle of thread are applicable to threads having 111/2 or less turns per in. (111/2 or less turns per 25.4 mm). All thread dimensions shown without tolerances are related to the basis for connection design and are not subject to measurement to determine acceptance or rejection of product.

Chemical Composition(%)
Grade	C	Mn	Mo	Cr	Ni	Cu	P	S	Si
H40							≤0.03	≤0.03	—
J55/K55							≤0.03	≤0.03	—
N80-1/N80Q							≤0.03	≤0.03	—
R95	≤0.45ᶜ	≤1.9					≤0.03	≤0.03	—
L80	≤0.43ᵃ	≤1.9					≤0.03	≤0.03	—
L80-1	≤0.15	0.30~0.60	0.90~1.10	8.00~10.0	—	—	≤0.03	≤0.03	≤0.45
L80-13Cr	0.15~0.22	0.25~1.00		12.0~14.0	≤0.25	≤0.35	≤0.03	≤0.03	≤0.45
C90	≤0.35	≤1.20	0.25ᵇ~0.85	≤1.50	≤0.5	≤0.25	≤0.02	≤0.01	≤1
T95	≤0.35	≤1.20	0.25ᵇ~0.85	0.40~1.50	≤0.5	≤0.25	≤0.02	≤0.01	≤1
C110	≤0.35	≤1.20	0.25~1.00	0.40~0.15	≤0.99	—	≤0.02	≤0.01	—
P110					≤0.99	—	≤0.02	≤0.01	—
Q125	≤0.35	1.35	≤0.85	≤1.50	≤0.99	—	≤0.02	≤0.005	—

Mechanical properties
Grade	Total elongation under load（%）	Yield strength（Mpa）	Tensile strength（Mpa）	Hardness（HRC）	Hardness（HBW）
H40	0.5	276~552	414	—	—
J55	0.5	379~552	517	—	—
K55	0.5	379~552	655	—	—
N80-1/N80Q	0.5/0.5	552~758/552~758	689/689	—	—
R95	0.5	655	724	—	—
L80	0.5	552	655	23.0	241
L80-1/L80-9Cr	0.5	552	655	23.0	241
L80-13Cr	0.5	552	655	23.0	241
C90	0.5	621	689	25.4	255
T95	0.5	655	724	25.4	255
C110	0.7	758	793	30.0	286
P110	0.6	758	862	—	—
Q125	0.65	862	931	b	—

Coupling Pipe Grade Identification By Paint Color

Coupling colour code
Grade	Grade Type	Colour(s) for Coupling		Number andcolour of bandsfor product	Picture
Grade	Grade Type	EntireCoupling	Band(s)	Number andcolour of bandsfor product	Picture
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

What is OCTG and what are its main components?

OCTG stands for Oil Country Tubular Goods. It is a family of seamless or welded steel pipes specifically designed for use in oil and gas wells. OCTG is essential for drilling, completing, and producing from a well. The three primary components are:
Casing: The structural "backbone" of the well. It is run into the drilled hole to prevent the wellbore from collapsing and to isolate different underground formations (e.g., freshwater zones from oil/gas zones).
Tubing: The conduit placed inside the casing. It serves as the channel through which oil or gas is brought to the surface during production.
Drill Pipe: The heavy, thick-walled pipe used to transmit drilling fluid to the drill bit and to rotate the bit during the drilling process.

What steel grades do you supply, and what do they mean?

We supply a comprehensive range of API 5CT standard steel grades, each designed for specific well conditions. The grade indicates the minimum yield strength (in ksi) and the material's properties.
Group 1 (Standard Grades):
H40, J55, K55: General-purpose grades for shallow to medium-depth wells with low to moderate pressure. K55 is commonly used for surface casing.
Group 2 (Higher Strength):
N80 (Type 1 & 2): A versatile, high-strength grade suitable for a wide range of applications, including intermediate and production casing.
L80 (Type 1, 9Cr, 13Cr): Designed for sour service environments (containing H₂S). L80-13Cr offers superior corrosion resistance.
Group 3 (High Performance):
C90, T95: Used in high-pressure, high-temperature (HPHT) wells and sour service applications.
P110, Q125: High-strength grades for deep wells and high-pressure environments where maximum burst and collapse resistance are required.

What types of connections (threads) are available?

The connection is a critical component of any OCTG string. We offer both standard API connections and advanced Premium Connections.
API Connections:
Short Round Thread (STC): A simple, cost-effective connection for shallow wells.
Long Round Thread (LTC): Similar to STC but with a longer thread for slightly better performance.
Buttress Thread (BTC): Provides high tensile strength and is suitable for deeper, heavier wells.
Premium Connections (Non-API):
These are engineered for extreme conditions, offering superior gas-tight sealing, high tensile strength, and excellent fatigue resistance. They are essential for HPHT wells, deepwater applications, and complex well geometries. We can supply various premium connection types based on your specific project requirements.

How do you ensure the quality and integrity of the pipes?

We implement a rigorous multi-stage quality control process to ensure every pipe meets the required specifications:
Chemical Composition Analysis: Verifying the steel grade's elemental makeup.
Mechanical Property Testing: Including tensile, yield, hardness, and impact tests.
Hydrostatic Testing: Every pipe is pressure-tested to ensure it can withstand specified internal pressures without leaking.
Non-Destructive Testing (NDT): We utilize advanced NDT methods such as Ultrasonic Testing (UT) and Electromagnetic Testing (ET) to detect any internal or surface imperfections.
Dimensional Inspection: Precise measurement of outside diameter (OD), wall thickness, weight, and length.

What is your typical lead time and packaging for export?

Lead Time: For standard API grades and sizes, our lead time is typically 15-30 days after receiving the deposit and final order confirmation. For specialized grades or premium connections, the timeline may be longer.
Packaging: To ensure safe ocean transport, all OCTG products are securely packed. Threads are protected with steel or plastic protectors, and pipes are bundled with steel straps. We can also apply anti-corrosion oil or varnish and use wooden crates for extra protection as per customer requirements.