Figure 10. Areas of pump requiring servicing.
gases to the outside of the building. Make sure that the
even on the level. Avoid high points
exhaust piping has a large enough diameter to prevent
which will form air pockets. If the pump is
excessive exhaust back pressure in the engine.
operated at a high suction lift, use extra
care to see that the hose connections and
Table I. Freezing Points, Composition, and Specific
pipe joints in the suction line are air tight.
Gravities of Military Antifreeze Materials
A small air leak in the suction line may
prevent pump priming.
Ethylene
Lowest
Pints of
glycol
(4) Piping.
Unless the piping is well
expected
inhibited
Compound, antifreeze
coolant
supported install a section of hose
ambient
glycol per
Arctic
solution
between the piping and pump as close as
tempera-
gallon of
specific
possible to the pump.
Use a wire-
ture F.
coolant
gravity
encased rubber suction hose that will not
at 68 F.
collapse. If the pump is located so that
+20
1 1/2
Issued full strength
1.022
the suction hose is sharply inclined from
and
the pump, install a 45 or 90 elbow in the
+10
2
ready mixed for 0 to
1.036
suction line to prevent a sharp bend in the
0
2 3/4
-65 F. temperatures
1.047
suction hose. Breaks or air leaks often
- 10
3 1/4
for both initial in-
1.055
develop at the point of a sharp bend.
-20
3 1/2
stallation and replen-
1.062
-30
4
ishment of losses.
1.067
b. Discharge Line Friction loss should be given
.
-40
4
1.073
careful consideration. If the fluid is pumped a long
-50
Arctic Anti-
DO NOT DILUTE
-60
freeze
WITH WATER OR
distance, increase the size of the pipe to prevent pipe
-75
preferred
ANY OTHER SUB-
friction from becoming excessive.
.
STANCE.
W arning
Do not operate the centrifugal
Maximum protection is obtained at 60 percent by volume (4.8
pump in an enclosed area without
pints of ethylene glycol per gallon of solution).
venting the exhaust gases to the
Military Specifications MIL-C-11755 Arctic type, nonvolatile
outside. Exhaust fumes contain
antifreeze compound is intended for use in the cooling system
of liquid-cooled internal combustion engines. It is used for
carbon monoxide, and odorless,
protection against freezing primarily in Arctic regions where
colorless, deadly poison.
the ambient temperature remains for extended periods close
to -40 F. or drops below, to as low as -90 F.
c. Exhaust Piping If the pumping unit is installed
.
Use an accurate hydrometer. To test hydrometer, use 1 part
indoors, provide piping to carry exhaust
ethylene glycol antifreeze to 2 parts water. This should
produce a hydrometer reading of 0 F.
Note. Fasten a tag near the radiator filler cap indicating the
type antifreeze.
TAGO 63B-A
10
