Monitoring a hydraulic fluid filter

摘要

A hydraulic circuit for supplying hydraulic fluid to a subsea control module of a control system for an underwater hydrocarbon well. There is an input 1a or 1b for hydraulic fluid and a filter 2a or 2b connected with the input for filtering hydraulic fluid. There is an output 5 for supplying hydraulic fluid from the filter to the subsea control module. First sensing means 10a or 10b for sensing pressure of hydraulic fluid from the input upstream of the filter and second sensing means 8 for sensing pressure of hydraulic fluid downstream of the filter. There is a subsea electronics module 11 in the subsea control module, the subsea electronics module being coupled with the first and second sensing means and being adapted to produce an indication related to a hydraulic fluid pressure differential across the filter.