API 5CT N80 NUE Threads Casing Coupling Tubing Coupling
API 5CT N80 NUE Threads Casing Coupling Tubing Coupling
Product DescriptionShengji manufacture the tubing and casing coupling with more than 20-year production enperience, we can make EUE and NUE for casing tubing coupling, strictly comply with API 5CT/5B standard, the annual production capacity is 1,000,000 pcs.
The EXPE coating Tubing and Casing Coupling has good corrosion resistance and is used in combination with the HDPE liner tubing. It is widely used in high corrosion Wells.Shengji liner tubing are repair-free thereby extending performance 4.7 times. This reduces maintenance costs. All HDPE/EXPE liner tubing must pass strict quality inspection to guarantee 100% customer satisfaction. Shengji uses an advanced defect detection machine.
1. Coupling material cover the whole standard range.
2. High dimension precision.
3. Good peformance in Anti-Corrosion.
Tubing coupling specifications | OD mm | Min length mm | Weight kg | |||
NU | EN | NU | EN | NU | EN | |
1.9 | 55.88 | 63.5 | 93.25 | 98.42 | 0.56 | 0.84 |
2 3/8 | 73.02 | 77.8 | 107.95 | 123.82 | 1.28 | 1.55 |
2 7/8 | 88.9 | 93.17 | 130.18 | 133.35 | 2.34 | 2.4 |
3 1/2 | 107.95 | 114.3 | 142.88 | 146.05 | 3.71 | 4.1 |
4 | 120.65 | 127 | 146.05 | 152.4 | 4.35 | 4.82 |
4 1/2 | 132.08 | 141.3 | 155.58 | 158.75 | 4.89 | 6.05 |
Casing coupling specifications | OD mm | Min length mm | Weight kg | ||
short-thread | long-thread | short-thread | long-thread | ||
4 1/2 | 127 | 158.75 | 177.8 | 3.62 | 4.15 |
5 | 141.3 | 165.1 | 196.85 | 4.66 | 5.75 |
5 1/2 | 153.67 | 171.45 | 203.2 | 5.23 | 6.42 |
Performance of Internal Epoxy Coating
| Inspection Item | Standard | Inspection Method | ||
| 1 | Appearance | Smooth, Uniform color, no bubble, no cracking or contraction cavity, little range peel allowed | Visual | |
| 2 | Thermal Performance |ΔT g|(℃ ) | ≤ 5 | Appendix B | |
| 3 | cathodic disbanding resistance | ≤ 6.5 | Appendix C | |
| 24h or 48h (mm) | ||||
| 4 | Bonding surface porosity | 1~4 | Appendix D | |
| 5 | The section void ratio | 1~3 | Appendix D | |
| 6 | resistance to deflection 3° | No cracking | Appendix E | |
| 7 | Impact Energy (8J) | No pin hole | Appendix F | |
| 8 | Adhesive force | dissection method | 1~2 | Appendix G |
| pull off adhesion (MPa) | ≥ 20 | GB/T 5210 | ||
| 9 | Electric strength (MV/m) | ≥ 30 | GB/T 1408.1 | |
| 10 | Volume resistivity(Ω·m ) | ≥ 1×1013 | GB/T 1410 | |
| 11 | Salt fog resistance (1000h) | No change of anti-corrosion coating | GB/T 1771 | |
Performance Test
1.Magnetic Flux Leakage Testing
2. Ultrasonic Flaw Detection at the End of The Pipe
3.Magnetic Particle Inspection
4.X-ray Radiographic Inspection
5.Hydrostatic Test
In 1964, our factory is established;
In 1995, we bought in the first tubing production line;
In 2007, our company is restuctured;
In 2015, we became the supplier for Schlumberger and Haliburton.
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