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Diesel Tank to Tank Transfer for Generator Supplier - Flexible Impeller Pump

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Customer: Generator Supplier

Application: Diesel transfer from back up tank to day tank

Equipment Supplied: Flexible impeller pump

Location: UK

Equipment supplied

1 x Liverani INV Reversible Flexible Impeller Pump

  • Model: INV Minor 40
  • Stainless steel AISI 304
  • NBR Impeller and seal
  • Frequency converter
  • Remote control up to 15m
  • Fitted to customised stainless steel trolley w/ Flow Meter, Hosing & Ancillary Fittings
  • Supplementary 24V NC connector, dry running protection & thermal overload protection included.


We received an enquiry from a generator manufacturer looking for a fuel transfer pump. The customer wanted to be able to extract diesel stored in underground tanks (5m deep) through a 2” pipe and deliver it into a secondary tank to enable decommissioning to take place. They wanted the ability to vary the flow of the pump and also monitor the amount of diesel being extracted. The plan for the system was to be used and stored outdoors, powered by a single phase power supply, and needed to also house up to 20m of hose within it to enable the operator to connect different lengths of pipe together to achieve different discharge and suction heads. The extraction process from their tanks was currently taking upwards of 8 hours and they wanted to reduce this by as much as possible to reduce labour costs.

The challenge was to come up with a bespoke solution which was easy to operate and maintain, fitted into a small footprint whilst also providing good suction lift capabilities and an adequate varying flow range through the 2” pipe they had on site, which couldn’t be made any bigger.

Key challenges:

  • Reduce labour time associated with transfer process
  • Able to control and monitor the flow of the pump
  • Complete system (not just pump) required in small footprint


Considering all factors involved, we specified a remote controlled inverter driven flexible impeller pump mounted onto a bespoke trolley. This trolley system housed the pump and flow meter on one level, and the 4 x 5m coils of hose on a secondary level. Both sides of the trolley were fitted with lockable double doors to enable the operator to position the system, open the doors, connect the required hose lengths together and control and monitor the volume displaced over a 15m range. The supplied remote comes complete with on / off / reversing & speed control and pump fitted with dry run protection thus providing the operator with full control of the pump at the point of use. 

The flexible impeller pump in question was supplied in Stainless Steel AISI 304 with NBR impeller and seal, ideally suited to the fluid and environment it was intended for. Furthermore, due to these flexible vane pumps' innate ability to prime from 6m without the use of a non-return valve and handle solids up to 10 mm in diameter, it enabled the customer to prime from great depths and not worry about any sedimentation being drawn up from the bottom of the tanks.

The connections used throughout the system were of a CAM Lock design enabling quick assembly of the suction and discharge hose lengths, connection to the pump and disassembly of the system for any maintenance purposes. Dust caps and plugs were also supplied to provide protection from dirt ingress into the hose and pump whilst the system was not in use.

The trolley system was supplied with a powder coated finish with a high phosphate powder base coat ideally suited for use and storage outdoors, and fitted with 4 x swivel wheels, two of which had brakes, in order to provide as much maneuverability as possible.

We were able to design, build and supply a ready to use flexible impeller pump solution which fitted all the customer’s criteria and managed to cut their extracting time to less than 2 hours from 8 - significantly reducing their labour costs.

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.