TM 5-3895-374-24-2HEATTRANSFERFLUIDSThe fluid that is circulated through the heater is commonly referred to as "hot oil" since it is a petroleum derivative.However, this is a special fluid and should not be confused with conventional lubricating oils or diesel fuels.Lubricating oils have high thermal resistance and, therefore, transfer heat poorly. These oils would also clog theentire system and ruin the heater.The following is a list of heat transfer fluids or oils which are approved for use with CEI equipment. It is not all-inclusive, nor is it intended to exclude any other suitable product.PRODUCERPRODUCTNAMEPRODUCTNO.Continental Oil Co. Conoco Heat Transfer Oil---Humble Oil & Refining Co. Humble-Therm 500ARCO Rubilene S-215Texaco, Inc. Texatherm ---Gulf Oil Co. Security 44Mobil Oil Co. Mobiltherm 603Cities Service Oil Co. Citgo DC Oil 900 SeriesCities Service Oil Co. Citgo Pacemaker Oil ---Shell Oil Co. Thermia Oil CStandard Oil Co. Chevron Heat Transfer Oil 1Union Oil Co. Readline Series 255Pennsylvania Refining Co. Penn Drake Oil 1917Sunray DX Oil Co. DX Heat Transfer Fluid 572Sun Oil Co. Sun Heat Transfer Fluid 21Georgia-Carolina Oil Co. G-C Heavy Duty Transfer Fluid---Typical Specifications:Gravity A.P.I......................28-30Viscosity Index ........................95Flash Point........................420FPour Point ...............................5°FViscosity @ 100°F ............200SSUCarbon Residue. .....................0.10%Viscosity @ 210F ............50SSUNeutralization No.....................0.10Sulphur Content ......................0.5%The heat transfer oil should be paraffin base, solvent refined and is recommended for operating temperatures to450F.Some heating systems are presently using aromatic type oil and MUSTNOT be mixed with these paraffin-base oils.To do so will severely damage and clog the heater and heating system.page 3-921
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