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OCTG casing import standards

Date:2023-12-06View:256Tags:OCTG casing
OCTG casing import standards

According to the American Petroleum Institute standard APISPEC5CT 1988 1st edition, casing steel grades are H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P- There are 10 types of 110 and Q-125. The casing should be supplied with threads and couplings, or in any of the following pipe end forms: plain end, round thread without or with couplings, trapezoidal thread with or without couplings, direct connection Type thread, special end processing, sealing ring structure.


OCTG casing


Oil casing import standards

(1) Import standards mostly refer to the American Petroleum Institute standards API5A, 5AX, and 5AC. Steel grades are H-40, J-55, N-80, P-110, C-75, C-95, etc. The main specifications are 139.77.72R-2, 177.89.19R-2, 244.58.94R-2, 244.510.03R-2, 244.511.05R-2, etc.
(2) API specifies three lengths: R-1 is 4.88~7.62m, R-2 is 7.62~10.36m, and R-3 is 10.36m or longer.
(3) Some imported goods are marked with LTC, which means long threaded casing.
(4) In the claim cases, there have been appearance defects such as black buckles and threaded buckle damage, folding of the pipe body, broken buckles, excessive thread tightness, excessive coupling J value, and internal defects such as casing brittleness and low yield strength. quality problem.

Oil casing packaging

According to SY/T6194-96, domestic casing should be bundled with steel wire or steel belt. A protective ring should be screwed on the exposed portion of each casing and coupling thread to protect the thread.

(1) Domestic casing is stipulated in SY/T6194-96. The length of casing is not fixed, and its range is 8-13m. However, casing not shorter than 6m can be provided, and its quantity shall not exceed 20%.
(2) The internal and external surfaces of the casing shall be free of folds, hairlines, separation layers, cracks, folds and scars. These defects should be completely removed to a depth not exceeding 12.5% of the nominal wall thickness.
(3) The outer surface of the coupling shall not have defects such as folding, hair lines, separation layers, cracks, rolling, and scarring.

(4) The thread surface of the casing and coupling should be smooth, and no burrs, tears or other defects sufficient to interrupt the threads will affect the strength and tight connection.


outer diameter

theoretical weight

wall thickness

inside diameter

nominal diameter

Coupling outer diameter

Thread type

Steel grade

length

139.7 (5-1/2)

20.85(0.244) 23.09(15.50) 25.32(17.00) 29.79(20.00) 34.26(23.00)

6.20(0.244) 6.98(0.275) 7.72(0.304) 9.17(0.361) 10.54(0.415)

127.3(5.012) 125.7(4.950) 124.3(4.892) 121.4(4.778) 118.6(4.670)

124.1(4.887) 122.6(4.825) 121.1(4.767) 118.2(4.653) 115.4(4.545)

153.7 (6.050)

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

177.8 (7)

25.52917.00) 29.79(20.00) 34.26(23.00) 38.73(26.00) 43.20(29.00) 47.66(32.00) 52.13(35.00) 56.60(38.00)

5.87(0.231) 6.91(0.272) 8.05(0.317) 9.19(0.362) 10.36(0.408) 11.51(0.453) 12.65(0.498) 13.72(0.540)

166.1(6.538) 164.2(6.456) 161.7(6.366) 159.4(6.276) 157.1(6.180) 154.8(6.090) 152.5(6.004) 150.4(5.430)

162.9(6.413) 160.8(6.331) 158.5(6.204) 156.2(6.151) 153.9(6.059) 151.6(5.969) 149.3(5.879) 147.2(5.795)

194.5 (7.656)

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

219.1 (8-5/8)

35.75(24.00) 41.71(28.00) 47.66(32.00) 53.62(36.00) 59.58(40.00)

6.71(0.264) 7.72(0.304) 8.94(0.352) 10.16(0.400) 11.43(0.450)

205.7(8.093) 203.7(8.020) 201.2(7.927) 198.8(7.827) 196.2(7.724)

202.5(7.972) 200.5(7.894) 198.0(7.795) 195.6(7.701) 193.0(7.598)

244.5 (9.625)

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

244.5 (9-5/8)

48.11(32.30) 53.62(36.00) 59.58(40.00) 64.79(43.50) 70.01(47.00) 71.69(53.50)

7.92(0.312) 8.94(0.352) 10.03(0.395) 11.05(0.435) 11.99(0.472) 13.84(0.545)

228.7(9.001) 226.6(8.921) 224.4(8.835) 222.4(8.755) 220.5(8.681) 216.8(8.535)

244.7(8.845) 222.6(8.765) 220.4(8.679) 218.4(8.599) 216.5(8.525) 212.8(8.379)

269.6 (10.6250

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

273.0 (10-3/4)

48.78(32.75) 60.32(40.50) 67.77(45.50) 75.96(51.00) 82.67(55.50)

7.09(0.279) 8.89(0.350) 10.26(0.400) 11.43(0.450) 12.57(0.495)

258.9(10.192) 255.3(10.050) 252.7(9.950) 250.2(9.850) 247.9(9.760)

254.9(10.035) 251.3(9.894) 248.8(9.794) 246.2(9.694) 243.9(9.604)

298.5 (11.752)

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

339.7 (13-3/8)

71.50(48.00) 81.18(54.50) 90.86(61.00) 101.69(68.00)

8.38(0.330) 9.65(0.380) 10.92(0.430) 12.19(0.480)

322.9(12.715) 320.4(12.615) 317.9(12.515) 315.3(12.415)

319.0(12.559) 316.5(12.459) 313.9(12.359) 311.4(12.259)

365.1 (14.374)

Round thread, trapezoidal thread

j55 n80 p110

8m-12m (2602-39.4)

73.0 (2-7/8)

9.53(6.40) 11.62(7.90) 12.81(8.60)

5.51(0217) 7.01(0.276) 7.82(0.308)

62.00(2.441) 59.00(2.323) 57.40(2.259)

59.61(2.347) 56.62(2.229) 54.99(2.165)

88.9 (3.500)

Round thread

j55 n80

8.5m-9.5m (27.9-31.2)

88.9 (3-1/2)

11.47(7.70) 15.19(10.20)

5.49(0.216) 7.34(0.289)

77.9(3.067) 76.0(2.992)

24.25(2.943) 21.04(2.797)

107.95 (4.250)

Round thread

j55 n80

8.5m-9.5m (27.9-31.2)

114.3 (4-1/2)

18.77(12.60)

6.88(0.271)

100.5(3.957)

97.37(3.833)

132.08 (5.200)

Round thread

j55 n80

8.5m-9.5m (27.9-31)

  
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