Pressure protection system

摘要

A pressure protection system ( 32 ) has a docking manifold ( 44 ) to which an upstream portion ( 36 ) and a downstream portion ( 38 ) of a pipeline ( 34 ) are connected. Also connected to the docking manifold ( 44 ) is a retrievable module ( 64 ) which has a conduit circuit ( 66 ) that connects the upstream and downstream portions of the pipeline ( 34 ) enabling fluid to flow between the two portions ( 36, 38 ). The conduit circuit contains two fail-safe valves ( 72 ) which are controlled by a control module ( 80 ) within the retrievable module, and two pressure transmitters ( 76 ) co-operable with the control module ( 80 ). When wither pressure transmitter ( 76 ) senses fluid pressure in the conduit circuit ( 66 ) to be above a threshold value then it causes the control module ( 80 ) to effect closure of the valves ( 72 ) preventing the pressure rise from reaching the downstream portion ( 38 ) of the pipeline ( 34 ).