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COLW Series

The COL Series is a water cooled off-line fluid conditioning system utilizing reliable, high performing and low-noise screw pump technology. High efficiency is achieved by the utilization of an EK Series shell & tube heat exchanger. Options include cartridge style in-line filters and thermostat temperature sensors. This series is ideal for independent cooling and filtering of system oils.

Delta T Heat Exchangers is partnered with Thermal Transfer Products, a division of API Heat Transfer, to offer their pre-engineered heat exchangers. If you know your performance requirements, you can contact us by requesting a quote.



  • Ideal for independent cooling and filtering of system oils
  • Utilizes a high efficient EK series shell & tube (finned bundle) heat exchanger
  • Wall or floor mount
  • Low to medium pressure applications utilizing low noise screw pump technology
  • Pump flows ranging 9.5 GPM to 45 GPM
  • Standard SAE ports. NPT and BSP port adapters available

Product Options

  • Cartridge-style filters
  • Plugged filter indicators
  • Temperature sensors


  • Maximum Operating Pressure – Shell Side 250 PSI (17 BAR)
  • Maximum Operating Pressure – Tube Side 150 PSI (10.3 BAR)
  • Maximum Operating Temperature – without filter 250° F (121°C)
  • Maximum Operating Temperature – with filter 230° F (110°C)
  • Maximum Viscosity 150 cst

Customer Focused and Driven

  • All catalog product is available with short lead-times
  • Expert application engineers are available to select and size the right product for your application
  • Custom designs are available


All Models:
  • Pump – Positive displacement (screw)
  • Pump Motor – Nema frame
  • Shell – Steel
  • Tubes – Copper
  • Frame – Powder-coated carbon steel
  • Gaskets – Nitrile rubber/cellulose fiber
  • Mounting Brackets – Steel
  • Nameplate – Aluminum foil
COLW-20, 20W, 40, 40W, 80:
  • Tube Sheets – Steel
  • Baffles – Steel
  • Fins – Aluminum
  • End Caps – Grey iron
  • Baffles – Brass
  • Headers – Steel
  • Shell Connections – Steel
  • End Bonnets – Grey iron

Fluid Compatibility

  • Petroleum
  • Mineral oil HLP and HLVP
  • Ecologic fluids HETG-HEPG-HEE
  • Cutting oils (contact TTP)
  • Water/ethylene glycol (COLW-100 only)
  • Water-oil emulsions (COLW-100 only)
  • Water-Ethylene Glycol emulsions (COLW-100 only)