API-5CT NUE Tubing Pipe
API non-upset (NUE) tubing is put to use much less than EUE tubing.
The cost of NUE is usually just a bit less than EUE, along with the joint strength is substantially less. The coupling joint diameter of NUE is less than EUE, which provides certain benefits in cases where clearance is small.
API NUE joints are available in sizes of 1.050 to 4.500 inch.
ParametersValue
| Material | J55, K55, N80, N80Q, L80, P110, other grade available as your requirement | |
| Outer Diameter | 2-3/8"~4-1/2" (60~114.3mm) | |
| Wall Thickness | 4.83~16mm | |
| Forms of Thread | EUE, NUE and Integral-joint | |
| Length Range | R1(20~24ft), R2(28~32ft) | |
| MTR | accordance with API Specification 5CT |
Tolerances
ParametersValue
| Outside diameter | +-0.031 inch (0.79mm) | |
| Wall thickness | -12.5%, positive deviations are limited by pipe weight | |
| Weight Deviation | +6.5% /-3.5% |
Mechanical Properties
GradeTensile Strength (PSI/MPa)Yield Strenght (PSI/MPa)
| H-40 | No less than 60000(414) | Between 40000 (276) ~ 80000 (552) | ||
| J-55 | No less than 75000 (517) | Between 55000 (379) ~ 80000 (552) | ||
| N-80 | No less than 100000 (689) | Between 80000 (552) ~ 110000 (758) | ||
| P-110 | No less than 125000 (862) | Between 110000 (758) ~ 140000 (965) |
Inspection
Physical properties are checked and each length hydrostatically tested, normally to only 3,000 psi in the plain end (unthreaded) condition. The following are also checked:
Dimensions
Weights
Straightness
Lengths
Size and surface inspection
NDT and pressure test and third party certication
Hydrostatic
Drifting test
Physical and chemicail analysis
Hardness and pressure test.
Electromagnetic
Magnetic particle
Ultrasonic
Part of this inspection is to drift all lengths.
Despite all the American Petroleum Institute (API) specifications and testing, some tubing defects are still found after delivery; thus, some operators do further inspection.
Inspection Method
Dimensions and Weight
| sizes | ODDmm | weight | wttmm | Type of end | |||||||||||
| 1 | 2 | NU kg/m | EU kg/m | IJ kg/m | |||||||||||
| NU | EU | IJ | |||||||||||||
| H40 | J55 | L80 | N80 1¸Qàà | C90 | T95 | P110 | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 2-3/82-3/82-3/82-3/8 2-3/8 | 4.004.605.806.60 7.35 | -4.705.95- 7.45 | —- - | 60.3260.3260.3260.32 60.32 | 5.956.858.639.82 10.94 | -6.998.85- 11.09 | —- - | 4.244.836.457.49 8.53 | PUPNU– - | PNPNU– - | PNPNUPNUP PU | PNPNUPNU- - | PNPNUPNUP PU | PNPNUPNUP PU | -PNUPNU- - |
| 2-7/82-7/82-7/82-7/8 2-7/8 2-7/8 | 6.407.808.609.35 10.50 11.50 | 6.507.908.709.45 - - | —- - - | 73.0273.0273.0273.02 73.02 73.02 | 9.5211.6112.8013.91 15.63 17.11 | 9.6711.7612.9514.06 - - | —- - - | 5.517.017.828.64 9.96 11.18 | PNU— - - | PNU— - - | PNUPNUPNUPU P P | PNUPNUPNU- - - | PNUPNUPNUPU P P | PNUPNUPNUPU P P | PNUPNUPNU- - - |
| 3-1/23-1/23-1/23-1/2 3-1/2 3-1/2 3-1/2 | 7.709.2010.2012.70 14.30 15.50 17.00 | -9.30-12.95 - - - | —- - - - | 88.9088.9088.9088.90 88.90 88.90 88.90 | 11.4613.6915.1818.90 21.28 23.07 25.30 | -13.84-19.27 - - - | —- - - - | 5.496.457.349.52 10.92 12.09 13.46 | PNPNUPN- - - - | PNPNUPN- - - - | PNPNUPNPNU P P P | PNPNUPNPNU - - - | PNPNUPNPNU P P P | PNPNUPNPNU P P P | -PNU-PNU - - - |
| 4444 4 4 | 9.5010.7013.2016.10 18.90 22.20 | -11.00– - - | —- - - | 101.60101.60101.60101.60 101.60 101.60 | 14.14-19.6423.96 28.13 33.04 | -16.37– - - | —- - - | 5.746.658.3810.54 12.70 15.49 | PNPU– - - | PNPU– - - | PNPUPP P P | PNPU– - - | PNPUPP P P | PNPUPP P P | —- - - |
| 4-1/24-1/2 | 12.6015.20 | 12.75- | – | 114.30114.30 | 18.7522.62 | 18.97- | – | 6.888.56 | PNU- | PNU- | PNUP | PNU- | PNUP | PNUP | – |
| 4-1/24-1/24-1/24-1/2 4-1/2 | 17.0018.9021.5023.70 26.10 | —- - | —- - | 114.30114.30114.30114.30 114.30 | 25.3028.1332.0035.27 38.84 | —- - | —- - | 9.6510.9212.7014.22 16.00 | —- - | —- - | PPPP P | —- - | PPPP P | PPPP P | —- - |
| P_Plain end;N—Non-upset threaded and coupled;U—External upset threaded and coupled;I—insert joint. | |||||||||||||||
