Water-Cooled Off-Line Fluid Conditioning System — Cooling & Filtration with Integral Pump

The Thermal Transfer Products COLW Series is a water-cooled off-line fluid conditioning system for independent cooling and filtering of hydraulic and lube system oils. It runs as a self-contained loop — often called an off-line or “kidney loop” conditioning circuit — driven by reliable, high-performing, low-noise screw pump technology, so it conditions the reservoir continuously without depending on the main system’s flow.

High efficiency comes from its EK Series finned-tube shell & tube heat exchanger, whose extended aluminum finned-tube surface area achieves strong heat rejection while minimizing cooling-water consumption — an advantage for water-conscious and environmentally responsible operations. This makes the COLW well suited to large hydraulic power units, lube systems, and gearboxes where oil temperature and cleanliness must stay tightly controlled and a cooling-water supply is available.

Each package integrates the pump, motor, EK shell & tube exchanger, and optional filtration on one unit. Options include cartridge-style in-line filters for contamination control and thermostat temperature sensors for automatic control. Connections are standard SAE ports, with NPT and BSP port adapters available. TTP’s XSelector^® sizing program — available online and as a mobile app — helps configure and size the right package for your reservoir volume, heat load, and filtration needs.

Consult catalog for additional sizes and technical information.

Off-Line Fluid Conditioning System — Air-Cooled Cooling & Filtration with Integral Pump

The Thermal Transfer Products COL Series is an air-cooled off-line fluid conditioning system that provides independent cooling and filtering of system oils. Built around reliable, high-performing screw pump technology, it runs as a self-contained loop — often called an off-line or “kidney loop” conditioning circuit — so it cools and filters the reservoir continuously without depending on the main system’s flow. That makes it ideal for large hydraulic reservoirs, lube systems, and gearboxes where consistent oil temperature and cleanliness are critical.

Each package integrates the pump, motor, air-cooled heat exchanger, and optional filtration on one unit. Choose the standard brazed aluminum P-BAR^™ bar-and-plate core, or the optional T-BAR^™ extruded-tube core for high-viscosity fluids to reduce pressure drop. Other options include cartridge-style in-line filters for contamination control and thermostat temperature sensors for automatic fan or system control.

The COL Series has a maximum operating pressure of 250 PSI and a maximum operating temperature of 300°F without a filter, or 230°F with a filter. TTP’s XSelector^® sizing program — available online and as a mobile app — helps configure and size the right package for your reservoir volume, heat load, and filtration needs.