91原片BEAR™ has been designed and tested to meet the needs for critical well loads. The design incorporates metal-to-metal seals with a 15° internal torque shoulder to ensure sealing under extreme loads.
The negative load frank thread form and coupled design provide 100% tensile efficiency for the standard coupling.
Special clearance coupling OD’s are available with full pipe body internal and external pressure ratings.
| Design | Advantage | |
|---|---|---|
| Negative (-5°) load flank angle on threads | ➡ | Superior bending capability due to hook threads |
| 25° angle for thread stabbing flank | ➡ | Excellent stabbing performance due to high stabbing flank angle |
| 15° torque shoulder | ➡ | Reduced hoop stress |
| Reduced gap between stabbing flanks on pipe & coupling thread | ➡ | High compression rating & galling resistance due to optimum gap |
| Contour metal-to-metal seal between pin and coupling | ➡ | Galling resistance due to point seal type |
