TM 5-3895-374-24-2
HEAT TRANSFER FLUIDS
The 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 the
entire 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.
PRODUCER
PRODUCT NAME
PRODUCT NO.
Continental Oil Co.
Conoco Heat Transfer Oil
---
Humble Oil & Refining Co.
Humble-Therm
500
ARCO
Rubilene
S-215
Texaco, Inc.
Texatherm
---
Gulf Oil Co.
Security
44
Mobil Oil Co.
Mobiltherm
603
Cities Service Oil Co.
Citgo DC Oil
900 Series
Cities Service Oil Co.
Citgo Pacemaker Oil
---
Shell Oil Co.
Thermia Oil
C
Standard Oil Co.
Chevron Heat Transfer Oil
1
Union Oil Co.
Readline Series
255
Pennsylvania Refining Co.
Penn Drake Oil
1917
Sunray DX Oil Co.
DX Heat Transfer Fluid
572
Sun Oil Co.
Sun Heat Transfer Fluid
21
Georgia-Carolina Oil Co.
G-C Heavy Duty Transfer Fluid
---
Typical Specifications:
Gravity A.P.I......................
28-30
Viscosity Index ........................
95
Flash Point........................
420F
Pour Point ...............................
5°F
Viscosity @ 100°F ............
200SSU
Carbon Residue. .....................
0.10%
Viscosity @ 210F ............
50SSU
Neutralization No.....................
0.10
Sulphur Content ......................
0.5%
The heat transfer oil should be paraffin base, solvent refined and is recommended for operating temperatures to
450F.
Some heating systems are presently using aromatic type oil and MUST NOT be mixed with these paraffin-base oils.
To do so will severely damage and clog the heater and heating system.
page 3-921
