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OCTG

We are committed to providing one-stop service for steel pipe products to customers around the world.

Casing And Tubing Coupling Suppliers,Manufacturers in china
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  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers
  • seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers

Casing And Tubing Coupling

Category : OCTG

Product: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

Surface:Whole Phosphating or inside phosphating and outside coating

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

  • Description
  • Specification
  • Standard
  • Process
  • Packing

About Tubing coupling

Normally tubing coupling OD maximum is 4 1/2”, as the tubing pipe is applied for the drilling activities (Inside the tubing is the sucker rod to drill/pump the oil), couplings type is more various and rigorous than casing, mostly used is thicken type upset coupling (Internal upset and external upset), for short is EUE coupling, it is the most favorable in tubing connections. Tubing with EU end (EUE) coupling connection also called UPTBG. Because of the end of the tubing is thickened (upset), the connecting stress is better than buttress coupling.

Buttress coupling another type used for tubing connections, it has the same thickness of the pipe body, called NU end (NUE)tubing or TBG.

Features

The oil tubing coupling can solve the problem of fatigue fracture in the existing coupling due to stress concentration. Oil tubing end is connected to the inside wall of the coupling in a tapered thread. The coupling body end and oil tubing are connected with same thread pitch flat thread. The coupling is not easy to produce fatigue fracture, and has good connection effect. It can prevent the accident of oil well pipe string break effectively.

About Casing coupling

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.

Seamless and ERW Casing

Specification

API 5CT

Grades

K55, N80, L80, C95, P110, Chrome, J55(Modified), J55 (API), PS80

Special Grades

For sour services and for deep well with high collapse properties

Dimensions

OD 4" - 26" WT - 0.2 -0.5"

Length range

1, 2 or 3

Thread connections

API (STC and LTC), BTC, extreme line, VAM premium connections, integral connections, integral metal seal connections, threaded and coupled connections and integral thread seal connections, etc.

Seamless and ERW Tubing

Specification

API 5CT

Grades

J55 (API) J55(Modified), N80, L80, L80 13Cr, P110, Q125, H40 (API)

Thread connections

API 5B - Last Edition or Premium, VAM Premium, EUE, NUE, special seal, metal-to-metal seal and VAGT


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


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

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

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

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

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

 Coupling colour code

Grade

Grade Type

Colour(s) for Coupling

Number andcolour of bands

for product

Picture

EntireCoupling

Band(s)

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

  


Casing coupling and tubing coupling are manufactured according to API 5CT and 5B specifications.

API 5CT--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 tubular with connections not covered by API standards,Not applicable to threading requirements.

API 5B--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(%)

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

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


Pipe Process of API 5CT Couplings
Round Pipe →  pipe inspection  → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection  → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application  → Coating  → Measurement of  Length and Weight → Colour Identification → Marking → Packing → Warehousing

 

Test &  Inspection

According to API 5CT,API 5B or customer specified standards strict inspection and test system is used before shipping including appearance inspection, dimension inspection, chemical composition inspection, performance test, strength test, tensile test, hardness test, NDT, hydrostatic test, etc. The great products will be supplied and there is no worry about the quality.

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