The 2" Coupler is a unique hydraulically retractable coupler creating remote engage and disengage functionality. It reduces
the reliance on ROVs subsea, creates new opportunities for remote emergency release system designs, and allows people to
be removed from stab plate engagement functions on surface. It also allows heavy duty engagement of subsea equipment to
be separated from the comparatively delicate engagement of control system interfaces.
Extremely robust and designed for constant heavy duty operations, the coupler operates on very small fluid volumes to
ensure rapid movement. It is specifically designed to cope with solids laden fluids such as drilling muds and well effluents.
Rated to 10,000psi hydraulic bore pressure and 5,000psi hydraulic function pressure, the 2” hydraulic coupler is pressure
balanced in both the extended and the retracted positions, ensuring that the coupler will remain in position in the event of
hydraulic operating system failure. Additionally, it is possible to pressure test to full system working pressure against the
retracted coupler without the need for an additional test cap.
When retracted, the coupler stinger is flush with the coupler plate, preventing dirt ingress and preventing external impact on
the retracted coupler from damaging the seals.
The coupler is fully Lloyds design verified and qualified to 3,000m (10,000ft) water depth, rated to 10,000psi hydraulic bore
pressure and 5,000psi hydraulic function pressure. It has also completed a full API 6A P-V PR-2 temperature cycle qualification
test programme. It can be used on subsea wellhead connectors, riser connectors, emergency disconnect packages, quick
release stab plates and emergency disconnect points. This coupler is used in the STL Xtreme Release (XR) Connector to
provide unique robust operation and functionality.