Emergency pressure relief vents provide an emergency pressure relief opening for storage tanks when exposed to overpressures. It is designed with a hinged cover that begins to open at the predetermined setting and relieves excess pressure. When the overpressure dissipates, the cover reseals tightly onto the base. The hinge mechanism prevents misalignment and provides an accurate reseat.
The Emergency Release Breakaway Coupling is a typical application. When an operator is present at the site and the operator sees a ship drifting away and a stress on the system is about to occur, the operator can intervene directly by pumping the hand pump, which is located at some distance from the coupling, and with 2 or 3 strokes create enough pressure thus moving the hydraulic cylinder on the coupling. The cylinder moves applying pressure on the collar release mechanism thus causing a release and the poppets close. The half of the coupling that falls off is kept from falling into the water by a cable that is attached to the other half of the coupling. If the operator is not present at the site to intervene in case of a ship drifting away, then the mechanical back up cable release takes over.