6-31
T-294-01
6.28 WATER-COOLED CONDENSER
The water-cooled condenser is of the shell and coil type
with water circulating through the cupro-nickel coil.
The refrigerant vapor is admitted to the shell side and is
condensed on the outer surface of the coil.
Rust, scale and slime on the water-cooling surfaces
inside of the coil interfere with the transfer of heat,
reduce system capacity, cause higher head pressures
and increase the load on the system.
If the water-cooled condenser is dirty, it may be cleaned
and de-scaled by the following procedure:
a. Turn unit off and disconnect main power.
b. Disconnect water pressure switch tubing by
loosening the two flare nuts. Install one-quarter
inch flare cap on water-cooled condenser inlet tube
(replaces tubing flare nut). De-scale tubing if
necessary.
What You Will Need:
1. Oakite composition No. 22, available as a powder
in 68 kg (150 lb) and 136 kg (300 lb).
2. Oakite composition No. 32, available as a liquid in
cases, each containing 3.785 liters (4 U.S. gallon)
bottles and also in carboys of 52.6 kg (116 lbs) net.
3. Fresh clean water.
4. Acid proof pump and containers or bottles with
rubber hose.
NOTE
When Oakite compound No. 32 is being used
for the first time, the local Oakite Technical
Service representative should be called in for
their suggestions in planning the procedure.
They will show you how to do the work with a
minimum dismantling of equipment: how to
estimate the time and amount of compound
required; how to prepare the solution; how to
control and conclude the de-scaling operation
by rinsing and neutralizing equipment before
putting it back into service. Their knowledge of
metals, types of scale, water conditions and
de-scaling techniques will be highly useful to
you.
Summary of Procedure:
a. Drain water from condenser tubing circuit. Clean
water tubes with Oakite No. 22 to remove mud and
slime.
b. Flush.
c. De-scale water tubes with Oakite No. 32 to remove
scale.
d. Flush.
e. Neutralize.
f. Flush.
g. Put unit back in service under normal load and
check head (discharge) pressure.
Detailed Procedure:
1. Drain and flush the water circuit of the condenser
coil. If scale on the tube inner surfaces is
accompanied by slime, a thorough cleaning is
necessary before de-scaling process can be
accomplished.
2. To remove slime or mud, use Oakite composition
No. 22. Mixed 170 grams (6 ounces) per 3.785 liters
(1 U.S. gallon) of water. Warm this solution and
circulate through the tubes until all slime and mud
has been removed.
3. After cleaning, flush tubes thoroughly with fresh
clean water.
4. Prepare a 15% by volume solution for de-scaling,
by diluting Oakite compound No. 32 with water.
This is accomplished by slowly adding 0.47 liter (1
U.S. pint) of the acid (Oakite No. 32) to 2.8 liters (3
U.S. quarts) of water.
WARNING
Oakite No. 32 is an acid --be sure that the
acid is slowly added to the water. DO NOT
PUT WATER INTO THE ACID! -- this will
cause spattering and excessive heat.
Wear rubber gloves and wash the solution
from the skin immediately if accidental
contact occurs. Do not allow the solution to
splash onto concrete.
5. Fill the tubes with this solution by filling from the
bottom. See Figure 6-33. Important: be sure to
provide a vent at the top for escaping gas.
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