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Manual 2100-518B
Page 29 of 30
Propylene Glycol – Non-toxic, non-corrosive,
expensive, hard to handle when cold, poorest heat transfer,
has formed “slime-type” coatings inside system piping.
Propylene Glycol is acceptable in systems anticipating
loop temperatures no colder than 40°F (4.4°C). These
systems typically use antifreeze because of low ambient
conditions (outside plumbing or cooling tower, etc.).
When loop temperatures are below 40°F, the uid becomes
very difcult to pump and heat transfer characteristics
suffer greatly. Only food grade propylene glycol is
recommended to prevent the corrosion inhibitors from
reacting with local water causing “slime-type” coatings
inside heat exchangers. If propylene glycol must be
used (code requirements), careful consideration of loop
Reynolds numbers, pump selection and pressure drop must
be considered.
Potassium Acetate (GS4) – Non-toxic, good heat
transfer, high price, non-corrosive with added inhibitors,
low viscosity. Due to its low surface tension, Potassium
Acetate has been known to leak through mechanical
ttings and certain thread sealants. A variant of the salt
family, it can be extremely corrosive when exposed to air.
Potassium Acetate is not recommended in ground loop
applications due to the leaking and (ultimately) corrosion
problems associated with it.
NOTE: Consult with your local distributor if you have
questions regarding antifreeze selection and any comments
to report about problems or success with any particular
methods in your area.
TYPE SIZE
VOLUME
(U.S. GALLON/100'PIPE)
VOLUME
(LITERS/10 METERS)
Copper 1" CTS 4.1 15.5
Copper 1-1/4" CTS 6.4 24.2
Copper 1-1/2" CTS 9.2 34.8
Polyethylene 3/4" - IPS SDR 11 3.0 11.4
Polyethylene 1" - IPS SDR 11 4.7 17.8
Polyethylene 1-1/4" - IPS SDR 11 7.5 28.4
Polyethylene 1-1/2" - IPS SDR 11 9.8 37.1
Polyethylene 2" - IPS SDR 11 15.4 58.3
Type
Minimum Temperature for Freeze Protection
10°F (-12.2°C) 15°F (-9.4°C) 20°F (-6.7°C) 25°F (-3.9°C)
Methanol 25% 21% 16% 10%
Ethanol * 29% 25% 20% 14%
100% USP
Food Grade
Propylene
Glycol
27% 24% 20% 13%
ANTIFREEZE SELECTION & USE (CONTINUED)
TABLE 4
FLUID VOLUME
TABLE 5
PERCENTAGES BY VOLUME
Approximate Fluid Volume per 100’ (10 Meters) of Pipe
Antifreeze Percentages by Volume
* Must not be denatured with any petroleum based product.