Talk to us today: +44 (0) 1773 533 283

My Enquiry List: 0 itemsView list


Refrigeration Engineers

Customer: Refrigeration Engineering Company

Location: UK

Equipment Supplied

2 x Horizontal Close-coupled Centrifugal Pumps with Air Priming Ejectors
Azcue SP-MN Range

  • Application: Refrigeration Cooling Pump
  • Fluid: Sea Water
  • Temperature: Ambient
  • Flow: 500m³/h
  • Total head: 16.4 m
  • IE2 Motor: 30 kW, 400V, 3Ph, 50 Hz, 1450 rpm
  • NPSHr 3.68 m, Isol/Prot. F/IP-55
  • Mechanical Seal
  • Bronze Pump Casing
  • Bronze Impeller
  • S/discharge Ø 200/150
  • St. Steel Shaft
  • Impeller Size Ø269


A UK based engineering firm was looking to purchase several centrifugal pumps to install on their new gas refrigeration system. The aim of this new system was to demonstrate to their customers how much energy they could potentially save by upgrading their dated refrigeration setup. They were struggling to find a reliable self priming centrifugal pump that could handle the requested 8,300 l/min.

A reliable pump was vital for this system as the pump would be working 24 hours a day; its function was to keep the heat exchanger cool as the refrigeration gas was circulating through it.


We quoted two high flow centrifugal self priming pumps with air priming ejectors. The MN-VP close coupled centrifugal water pumps have a unique feature whereby they have an air operated self-priming pump attached to the main pump which starts intermittently operated via a pressure switch. This ensures a completely automatic system, as they would automatically re-prime the pump should there be any loss of prime, and no need to manually operate the pumps.

The additional second pump provides a backup to the main pump to ensure the cooling of the heat exchanger should the main pump require maintaining or worst case fails. This duty / standby arrangement is the safest and most efficient way to ensure the refrigeration system is never down.

Typically with a self priming centrifugal water pump only flows of up to 300M³H ( 5000L/min) are possible which makes the MN SP an excellent choice given its high flow range.

You can download this case study by clicking on the image below...

      Castle Pumps are fully accredited to enable you to buy with confidence. Our accreditation includes:

Our accreditation