Subsea hydraulic system design parameters
The following main parameters need to be considered/determined for the hydraulic system:
- Hydraulic fluid reservoir sizing;
- The time to prime the hydraulic system from a depressurized state;
- Opening and closing response times of the process valves under conditions of minimum and maximum process pressure;
- The time for the pressure to recover following a process valve opening;
- The time to carry out a sequence of valve openings, such as the opening of a tree (neglecting choke valve operation);
- The stability of opened control and process valves to pressure transients, caused by operation of the other control and process valves (sympathetic control valve de-latching, process valve partial closing, etc.);
- Response time to close process valves in the event of a common close command, such as an emergency shutdown at the surface, venting off hydraulic control valves via supply lines;
- The time to vent the umbilical hydraulic supplies;
- The impact that failure of subsea accumulation has on the safe operation and closure of the process valves;
- The extent of control fluid leakage rate that can be accommodated by the system;
- System response times for simultaneously opening and closing multiple choke valves.
See also
References
- Subsea Engineering Handbook by Yong Bai and Qiang Bai, Publication Date: January 27, 2012 | ISBN-10: 0123978041 | ISBN-13: 978-0123978042 | Edition: 1