Compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module

A compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module, the system comprising:

• a hydraulic fluid supply configured to provide barrier fluid and lubrication fluid to the subsea motor and pump module;
• a barrier fluid circuit in which the hydraulic fluid is pre-tensioned towards a motor of the subsea motor and pump module by a pressure applied from a first separating pressure compensator;
• and
• a lubrication fluid circuit in which the hydraulic fluid is pre-tensioned towards a pump of the subsea motor and pump module by a pressure applied from a second separating pressure compensator,
• wherein the second pressure compensator is responsive to a pumped medium pressure at a suction side or at a discharge side of the pump and applies the sum of the pumped medium pressure and an inherent pre-tensioning pressure of the second pressure compensator to the lubrication fluid circuit, and
• wherein when the pump is operational, the first pressure compensator is responsive to the pressure in the lubrication fluid circuit and applies the sum of the pressure in the lubrication fluid circuit and an inherent pre-tensioning pressure of the first pressure compensator to the barrier fluid circuit.