Structure
- Connection is designed with extreme-line thread without coupling.
- WSP-IF adopts straight, non-interference thread style. Loading surface angle is 7.5°, stabbing surface angle is 20°. WSP-IF8 is 8TPI, IF6 is 6TPI, IF4 is 4TPI.
- Metal-to-metal internal pressure seal is rated at 100% of the pipe body. The 100% external pressure seal is created at the torque shoulder.
- External shoulder designed with -60°negative angle shoulder, internal shoulder is rectangle shoulder.
- Surface treatment: internal and external thread needs phosphate treatment.
Performance
- The two-step, non-interference thread style provides WSP-IF with very good
galling resistance.
- H2S service suitability is ensured by combining the low stress profile of non-interference threads with fixed make-up position control of a shouldered connection.
- The 100% external pressure seal is created at the torque shoulder. Metal-to-metal internal pressure seal is rated at 100% of the pipe body.
- 100% pipe body tension strength is produced by machining pin and box on a hot-forged upset. Connection critical areas exceed the pipe body area.
- High torque strength is provided by the reverse angle shoulder. The shoulder
also provides excellent resistance to compression and bending loads.