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Tubing and Casing Coupling

Product Name:Casing and Tubing Coupling, Casing Coupling, Tubing Coupling

Application: Used for connect 2 joints of tubing or casing

Size:Tubing Coupling : 1.9'' -  4-1/2''
        Casing  Couping :  4-1/2'' - 13-3/8''

Pipe Standard: API 5CT and 5B PSL1/PSL2  J55,K55,N80-1,N80-Q,API 5CT and 5B L80-1,C90, C95,T95, P110, Q125

Color Code:  J55 Green; L80 Red with brown strips;N80 Red with green strips;P110 White

Surface:Whole Phosphating or inside phosphating and outside coating

Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM,HYDRILL CS

Special Service: Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156

Introduction

Couplings are short lengths of pipe used to connect 2 joints of tubing or casing.

They come with painted colour codes on their external surface to indicate their grades.

Couplings are manufactured according to API 5CT and 5B specifications.

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 Upset;External Upset
Grade:J-55, C-75, L-80, N-80, C-95, P-110
Option:Electro-zinc plated;Phosphorised

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

API 5B, Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe Threads.This Specification covers dimensions, tolerances and marking requirements for API threads and the gauges that control the acceptance criteria for the threads. Thread element gauges, instruments and requirements for the inspection of threads for line pipe, round thread casing, and buttress casing connections are included.  

API Spec 5CT, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.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).

Application: casing coupling is a kind of drilling tool in oil field, which is mainly used for casing connection. The casing coupling mainly solves the problem that the existing coupling is prone to fatigue fracture due to stress concentration.

Structure:The casing end is connected with the inner wall of the coupling by tapered thread, and the end of the coupling body is connected with the oil pipe by the same thread and the same pitch flat thread. The utility model has the characteristics of relieving the stress concentration at the root of the external thread of the single taper thread connecting sleeve, not easy to produce fatigue fracture, and the connection effect is good.

The thread type of casing couplngs main include: Long Round-thread Casing Coupling(LC), Short Round-thread Casing coupling(SC), Buttress Thread Casing Coupling(BC), and steel grade mainly include: J55, K55, N80, L80, P110 and so on.

Specification

Casing Couplings Short Thread Specifications:

Casing Couplings
Short Thread

Casing Size OD (inches)

Coupling Size OD (inches)

Length (inches)

Weight per Coupling (lbs)

Palletized Carton Quantity

Palletized Carton Weight

图片1.png 

4-1/2

5.000

6.250

8.05

343

2716

5

5.563

6.500

10.18

210

2168

5-1/2

6.050

6.750

11.44

216

2501

6-5/8

7.390

7.250

19.97

115

2322

7

7.656

7.250

18.34

120

2231

7-5/8

8.500

7.500

26.93

80

2322

8-5/8

9.625

7.750

35.58

60

2132

9-5/8

10.625

7.750

39.51

50

2006

10-3/4

11.750

8.000

49.61

45

2079

11-3/4

12.750

8.000

50.49

35

1767

13-3/8

14.375

8.000

56.23

25

1436

16

17.000

9.000

78.98

20

 -

18-5/8

20

9.000

118.94

10 

 -

20

21.000

9.000

98.25

10 

 -


Casing Couplings Long Thread Specifications:

 Casing Couplings
Long Thread

Casing Size OD (inches)

Coupling Size OD (inches)

Length (inches)

Weight per Coupling (lbs)

Palletized Carton Quantity

Palletized Carton Weight

图片2.png 

4-1/2

5.000

7.000

9.07

294

2697

5

5.563

7.750

12.56

210

2573

5-1/2

6.050

8.000

14.03

180

2555

6-5/8

7.390

8.750

24.82

100

2315

7

7.656

9.000

23.67

100

2351

7-5/8

8.500

9.250

34.23

80

2807

8-5/8

9.625

10.000

47.48

48

2337

9-5/8

10.625

10.500

55.77

40

2302

10-3/4

11.750

* 10.500

* 62.38

45

* 36

11-3/4

12.750

* 10.500

* 67.59

30

* 24

13-3/8

14.375

* 10.500

* 76.63

25

* 20

16

17.000

* 11.000

* 96.55

20

* 16

18-5/8

20.000

-

-

10

8

20

21.000

* 11.500

* 126.74

10

8

* NOT API SPECIFICATIONS.

 

Casing Coupling - Buttress Thread

Casing Couplings
Buttress Thread

Casing Size OD (inches)

Coupling Size OD(inches)

Length (inches)

Weight per Coupling (lbs)

Palletized Carton Quantity

Palletized Carton Weight

图片3.png 

4-1/2

5.000

8.875

10.11

196

2007

5

5.563

9.125

12.99

144

2840

5-1/2

6.050

9.250

14.14

144

2061

6-5/8

7.390

9.625

24.46

92

2295

7

7.656

10.000

23.22

80

2068

7-5/8

8.500

10.375

64.84

64

2221

8-5/8

9.625

10.625

45.94

48

2414

9-5/8

10.625

10.625

50.99

40

2256

10-3/4

11.750

10.625

56.68

36

2307

11-3/4

12.750

10.625

61.74

24

2179

13-3/8

14.375

10.625

69.95

20

1429

16

17.000

10.625

87.56

16

-

18-5/8

20.000

10.625

138.03

8

-

20

21.000

10.625

110.33

8

-


Tubing Couplings - External Upset End (EUE):

 EUE
Tubing Couplings

Casing Size OD (inches)

Coupling Size OD (inches)

Threads per inch

Length (inches)

Weight per Coupling (lbs)

Palletized Carton Quantity

Palletized Carton Weight

图片4.png 

1.90

2.500

10 Round

-

1.85

-

-

2-3/8

3.063

8 Round

4.875

3.42

1,444

3942

2-7/8

3.668

8 Round

5.500

5.29

792

4220

3-1/2

4.500

8 Round

5.750

9.02

448

3860

4

5.000

8 Round

-

10.62

392

-

4-1/2

5.563

8 Round

6.500

13.31

252

3456


Tubing Couplings - Non Upset End (NUE)

 Non-Upset
Tubing Couplings

Casing Size OD (inches)

Coupling Size OD (inches)

Threads per inch

Length (inches)

Weight per Coupling (lbs)

Palletized Carton Quantity

Palletized Carton Weight

图片5.png 

1.90

2.200

10 Round

3.750

1.85

-

-

2-3/8

2.875

10 Round

4.500

2.82

1,512

4264

2-7/8

3.500

10 Round

5.500

5.15

800

4120

3-1/2

4.250

10 Round

5.625

8.17

502

4101

4

4.75

8 Round

5.75

9.57

392

-

4-1/2

5.200

8 Round

6.500

10.76

252

2712


Coupling Pipe Grade Identification By Paint Color

Grade

Colour Coding (Painted Outside)

H-40

Black

J-55 or K-55

Green

N-80

Red

M-65 or L-80

Red with one Brown Band

L-80 Type 9CR

Red with two Yellow Bands

L-80 Type 13CR

Red with one Yellow Band

C-90 Type 1

Purple

C-90 Type 2

Purple with one Yellow Band

T-95 Type 1

Silver

T-95 Type 2

Silver with one Yellow Band

C-95

Brown

P-110

White

Q-125 Type 1

Orange

Q-125 Type 2

Orange with one Yellow Band

Q-125 Type 3

Orange with one Green Band

Q-125 Type 4

Orange with one Brown Band

 

 

Production process

production process

Packaging

If you have any inquiries and questions, please contact CONTINENTAL STEEL CO.,LTD. at any time. Thanks in advance. Welcome!

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