Need advice on the right pump for your application? Call the team on 01773 533 283.

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

My Enquiry List: 0 itemsView list

  • Fast track icon

    MODELS AVAILABLE FROM STOCK Shorter lead times. Your deadlines met.

  • lightbulb icon

    APPLICATION EXPERIENCE YOU CAN RELY ON We'll specify the ideal solution for your process.

  • Piggy Bank Image Icon

    LOWER TOTAL LIFETIME COST SOLUTIONS Efficient, easy to maintain & long life design.

Seawater Dredging Pump for UK Company - Self Priming Centrifugal Pump

Download Case Study

Customer: Marine Dredging Company 

Application: Seawater dredging pump

Equipment supplied: Close coupled self priming centrifugal pump

Location: UK

Equipment Supplied

1 x Azcue CA Close Coupled Self Priming Centrifugal Pump

  • Type: CA-100-50
  • Liquid: Sea water containing sand
  • Flow: 75 m3/h
  • Total head: 12 m
  • NPSHr: 2.32 m
  • Power: 5.5 kW, 400v, 50Hz
  • RPM: 1450
  • Seal: Mechanical
  • S/discharge Ø: 100/100
  • Impeller: Bronze
  • Closed Impeller (10% Maximum sand content)
  • SiC/SiC Hard Faced Mechanical seal


Self Priming Centrifugal Pump

We received an enquiry from a marine dredging company that required a dredging pump that would be transferring sea water containing small amounts of sand in order to clear the bed of the harbour ready for ships to pass and dock. They specified to us that the casing material be cast iron to save costs, whilst we normally would always recommend bronze for sea water applications. They required the sea water pump to be self-priming, have 4” ports and transfer 75m³/hr at 12m head.

Key challenges:

  • Able to handle abrasive sand content
  • Needed to be able to self-prime


Given the customer's requirements and the fact this was a sea water based application, we immediately knew to select the CA self priming centrifugal pump from our Azcue range.

Whilst the customer instructed that to meet their budget they wanted the centrifugal pump to be cast in bronze, we persuaded them to accept a bronze impeller to ensure no sea water corrosion of the part most typical of wear.

In order to cope with the sand within the seawater, we specified a closed impeller than allows for the passing of up to 10% solid content. We also fitted the self priming pump with a hard faced mechanical seal to cope with the abrasive nature of the sand.

Castle Pumps are fully accredited to enable you to buy with confidence. Our accreditation includes: Our accreditation A division of the CTS Group, Part of Flow Max Ltd.