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PAGE 68 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)
COOLANT TREATMENT
Coolant Treatment
Antifreeze (ethylene or propylene glycol base) and water
are mixed to lower the freezing point of the cooling system
and to raise the boiling point. Refer to Table 24 to determine
the concentration ethylene or propylene glycol necessary
for protection against the coldest ambient expected.
Antifreeze/water mixture percentages in the range of 30/70
to 60/40 are recommended for most applications.
Propylene glycol based antifreeze is less toxic than ethylene
based antifreeze, offers superior liner protection, and
eliminates some fluid spillage and disposal reporting
requirements.
Replaceable coolant filters and treating elements minimize
coolant system fouling and corrosion. They are compatible
with most antifreeze formulations.
Coolant Heaters
An optional water jacket heater can be installed to keep
the engine warm for starting under adverse weather
conditions. Thermostatically controlled engine coolant
heaters are usually recommended to accurately control
coolant temperature. For Level 1 emergency power
systems, NFPA 110 requires that engine coolant be kept
at a minimum 90°F (32°C).
Connect the heater to a power source that will be on when
the engine is NOT running (such as commercial power or
other independent powers source).
Table 24. Freezing and Boiling Points vs. Concentration of Antifreeze
Mixture Base
Mixture Percentages (Antifreeze/Water)
0/100 30/70 40/60 50/50 60/40 95/5
Ethylene Glycol
Freezing Point
32°F
(0°C)
4°F
(-16°C)
-10°F
(-23°C)
-34°F
(-36°C)
-65°F
(-54°C)
8°F
(-13°C)
Boiling Point
212°F
(100°C)
220°F
(104°C)
222°F
(106°C)
226°F
(108°C)
230°F
(110°C)
345°F
(174°C)
Propylene Glycol
Freezing Point
32°F
(-0°C)
10°F
(-12°C)
-6°F
(-21°C)
-27°F
(-33°C)
-56°F
(-49°C)
-70°F
(-57°C)
Boiling Point
212°F
(100°C)
216°F
(102°C)
219°F
(104°C)
222°F
(106°C)
225°F
(107°C)
320°F
(160°C)