High integrity pressure protecting system (hipps) for a fluid line

摘要

The invention relates to a High Integrity Pressure Protecting System (HIPPS) for a fluid line and addresses the problem of the failure of external actuators resulting in a loss of actuation force. The present invention solves this problem by providing a HIPPS with an ON/OFF-valve including a housing including an inlet, an outlet, a conduit for a passage of a fluid from the inlet to the outlet, a closure element that is axially movable in a direction from the inlet to the outlet from an open position to a closed position, wherein the closure element opens the conduit allowing the passage in the open position and the closure element closes the conduit preventing the passage in the closed position; a hydraulic actuator including a control element that is fixated at the closure element, a switchable hydraulic supply unit, which supplies a control face of the control element with a control pressure in an active state, and releases the control pressure from the control face in a passive state, a sensor measuring a downstream pressure of the fluid downstream from the outlet, a logic solver that compares the downstream pressure to a critical value and switches the hydraulic supply unit to the active state allowing the closure element to move into or stay in the open position when the downstream pressure is below the critical value, and that switches the hydraulic supply unit to the passive state allowing the closure element to stay in the closed position, when the downstream pressure exceeds the critical value, and wherein an opposite face of the control element which opposite face is arranged opposite to the control face is exposed to the downstream pressure of the fluid so that the downstream pressure of the fluid pushes the closure element into the closed position.