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.
| Parameters |
|
Value |
| Material |
|
J55, K55, N80, N80Q, L80, P110, other grade available as your requirement |
| Outer Diameter |
|
2-3/8"~4-1/2" (73.02~114.3mm) |
| 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
| Parameters |
|
Value |
| 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
| Grade |
|
Tensile 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
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
- 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
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. |
