Jacketing
"Usually, "jacketing" refers to double-walled construction of pipe, valves, vessels, hose, etc., designed so that a hot or cold fluid can circulate in the cavity between the walls, Heating media include water, oils, steam, or proprietary high-boiling-point fluids which can be circulated at low pressure, such as Dowtherm or Therminol. Cooling media include water, water mixtures and various alcohols."
-Piping Guide, David R. Sherwood, 1991, ISBN 0-914-08219-1 www.pipingguide.com Received on Wed Oct 17 10:06:00 2001
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