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Hot Liquids


Their seal-less design enables Wanner’s Hydra-Cell pumps to handle virtually any liquid over a wide range of temperatures and pressures. Compatible fluids include viscous materials, thin non-lubricating liquids, acid or alkaline chemical solutions, and recycled liquids carrying abrasive particles.

When handling hot liquids, a key feature of the Hydra-Cell design, in which the pumped medium is isolated from the drive mechanism and 100% contained within the wetted end, is that the pump can handle heat simultaneously with other demands of the system such as high operating pressure, harsh liquid content, poor lubricity.

For pumps reliant on dynamic seals, high liquid temperature can be a complicating factor increasing the wear risk. Many liquids are thinner when hot, and as temperature rises their ability to lubricate the seals reduces, rendering them less effective and increasing risk of internal leakage. Some liquids can become more corrosive. Water, of all liquids the most commonly pumped, is many times more corrosive at 90°C than it is at 20°C.

In the Hydra-Cell design, with no seals to wear, heat is not a factor unless the temperature of the process liquid is exceptionally high, so the pump works well with hot liquids.

A proviso is that the viscosity of the lubricant in the drive end of the pump should be held within prescribed limits. For some installations where very hot liquids must be pumped, Wanner recommends fitting an oil cooler.

A range of oil coolers purpose-matched for use with Hydra-Cell pumps is offered by Wanner International – enabling the pumps to handle process liquids at temperatures up to 120ºC.

The coolers are of the air blast type, with built-in circulating gear pump and oil filter. They give excellent cooling efficiency, maintaining lubricant at correct viscosity and in good condition.

Wanner Oil Coolers meet EU conformity standards and are CE marked. The units are offered in two versions – for single or three-phase electrical supply.


See below for application examples from information supplied by customers.


The Hydra-Cell Advantage

  • Elimination of seal maintenance due to aggressive hot liquids
  • No dynamic seals to be damaged by non-lubricating hot liquids
  • No high speed rotating parts with dynamic seals in contact with process liquid
  • Simple construction - 
    • Simple service can be carried out without removing pump from installation
    • Larger models have been specially designed so that no heavy lifting equipment is needed to carry out liquid end service
    • No special tools or techniques are needed to carry out maintenance
    • No tight tolerances to maintain or set