Unifin Water Cooled Transformer Oil Coolers : Type OFW

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Forced Oil and Water Flow

Unifin International's favoured forced oil-water operated cooler is type OFW. All designs feature the Leak Detector Type of Double Concentric tubes connected between pairs of double tube sheets. Basic design is the Non-Removable Bundle style of Fixed Tubesheet exchanger in what is termed Non-Code construction (Operating and Design Conditions do not exceed those which would invoke the A.S.M.E. Pressure Vessel Code Section VIII, or Canada's C.S.A.B.-51). This heat exchanger is a forced oil-to-water shell & tube design that can be mounted in either vertical or horizontal positions. It too, is available in both conventional and leak detector versions, both with leak-free double tube sheet construction.

Features and Options

  • Safe design whose spaced double tube sheet prevent water entering the oil through a leaking tube joint
  • Double concentric tubes with longitudinal grooves at tube interfaces which stop higher pressure water entering the oil through a split or holed tube. Any leakage is to the space between tube sheets. This design prevents oil entering water in the same way thus, preventing environmental damage
  • Robust design with stiffer double concentric tubes more readily withstands "flow induced vibration"
  • Compact design made possible by an Integral Finned copper outer tube on oil side
  • Ease of access to the waterside without disturbing the water connections permits inspection and maintenance for fouling and corrosion
  • Longer dependable life resulting from the right choice of waterside materials

Construction and ratings are available in Unifin's OFW technical bulletin.

Type OFW Size Range

Sizes available range from 8" - 24" diameter. Lengths of 36" - 120" depending on diameter. Nominal capacity range, 60 kW to 1,500 kW.

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