Hydraulic Power Units

Our water-based hydraulic power units are used primarily for the activation of subsea valves. These are specialised, hazardous area pump units designed and built to a high specification. Indeed, our experience designing and manufacturing for hazardous areas is substantial.

Pump Performance

To achieve the performance and reliability that the application demands, we select a Hammelmann reciprocating plunger pump. These pumps are mounted vertically which saves space, and are known for their reliability and long service intervals.

The Container

The container is DNV 2.7-1 certified and can be lifted by fork truck or by the 5-leg sling set supplied with each unit. We mount the HMI controls and service connection manifold externally in lockable panels. Generally, the containers have three access doors and one set of large double doors – although the configuration is designed to suit individual requirements. There is an option to use a DNV 2.7-3 certified crash frame where weight is critical.

Inside the container there is a raised floor. This allows all high pressure and control hoses to run underneath to provide a trip/hazard-free walkway. There is clear access to both sides of the engine and pump assembly. ATEX-compliant internal lighting is an option.

We are here to help. Please call us on +44 1905 751790 or email sales@calder.co.uk.

  • Duplex pump head for seawater applications.
  • Container or crash frame.
  • Fire and gas detection system.
  • Permanent fire extinguishing system (foam).
  • Shut-down capability (permissive and feedback signals) from the main control room.
  • Internal hazardous area lighting.
  • Noise attenuation.
  • Actual value: discharge pressure or engine speed (RPM), depending upon control mode selected.
  • Set value: discharge pressure or engine speed (RPM), depending upon control mode selected.
  • Hours run.
  • Pump inlet water pressure and temperature.
  • Pump oil pressure and temperature.
  • Engine cooling water temperature.
  • Engine oil pressure.
  • Fuel level.
  • Battery condition.
  • Bypass valve air pressure.
  • Stainless steel water buffer tank.
  • Suction filter isolation valves.
  • Tachometer.
  • Pressure safety valve.
  • Pneumatically operated bypass valve.
  • Suction filter.
  • Spark arrestor.
  • Air compressor.
  • External stainless steel services manifold.
  • External fuel fill.
  • Lockable, external control panel.