The Hose End Valve (HEV / OHTP / NS Valve) is an integral part of an offloading system on-board an FPSO. Its primary function during an offloading operation is to connect the offloading hose string to a coupler on-board the receiving shuttle tanker. The HEV is self-closing, during an emergency release event the valve closes shut (fails safe) and prevents spillage of the offloading hose contents.
Emergency Release Coupling (ERC) will provide an active method of disconnection of the offloading hose string from the FPSO manifold. The ERC release signal activates an interlocked sequence of valve closure, valve close signal, then continues to release.
Marine Breakaway Couplings (MBCs) provide a passive method of disconnection of an offloading hose string. The MBC automatically activates a sequence of valve closure either when there is excessive tensile load on the hose string or an unacceptable surge in flow. The MBC then continues to separate.