6
−
12
T
−
318
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.
WARNING
Wear rubber gloves and wash the solution
from the skin immediately if accidental con-
tact occurs. Do not allow the solution to
splash onto concrete. PUT WATER INTO
THE ACID
−
this will cause spattering and
excessive heat.
5. Fill the tubes with this solution by filling from the bot-
tom. See Figure 6-16.
6
4
3
1
2
12
11
10
7
8
9
5
1. Pump support
2. Tank
3. Suction
4. Pump
5. Priming Connection
(Centrifugal pump
50 gpm at 35’ head)
6. Globe valves
7. Vent
8. Close vent pipe valve
when pump is running
9. Condenser
10. Remove water
regulating valve
11. Return
12. Fine mesh screen
Figure 6-16 Water-Cooled Condenser Cleaning,
Forced Circulation
NOTE
It is important to provide a vent at the top for
escaping gas.
6. Allow the Oakite No. 32 solution to soak in the tube
coils for several hours, periodically pump-circulating
it with an acid-proof pump.
An alternate method may be used whereby a pail
(see Figure 6-17) filled with the solution and at-
tached to the coils by a hose can serve the same pur-
pose by filling and draining. The solution must con-
tact the scale at every point for thorough de-scaling.
Air pockets in the solution should be avoided by reg-
ularly opening the vent to release gas.
Keep flames
away from the vent gases.
7. The time required for de-scaling will vary, depending
upon the extent of the deposits. One way to deter-
mine when de-scaling has been completed is to
titrate the solution periodically, using titrating equip-
ment provided free by the Oakite Technical Service
representative. As scale is being dissolved, titrate
readings will indicate that the Oakite No. 32 solution
is losing strength. When the reading remains
constant for a reasonable time, this is an indication
that scale has been dissolved.
3’ to 4’
1
2
3
4
5
1. Fill condenser with
cleaning solution. Do
not add solution more
rapidly than vent can
exhaust gases caused
by chemical action.
2. Approximately 5’
3. Condenser
4. Vent pipe
5. 1” pipe
Figure 6-17 Water-Cooled Condenser Cleaning -
Gravity Circulation
8. When de-scaling is complete, drain the solution and
flush thoroughly with water.
NOTE
If condenser cooling water is not being used as
drinking water or is not re-circulated in a closed
or tower system, neutralizing is not necessary.
9. Following the water flush, circulate a 56.7 gram
(2 ounce) per 3.785 liter (1 U.S. gallon) solution of
Oakite Aluminum Cleaner
®
164 thru the tubes to
neutralize. Drain this solution.
10.Flush the tubes thoroughly with fresh water.
11. Put the unit back in service and operate under nor-
mal load. Check the head pressure. If normal, a thor-
ough de-scaling has been achieved.
What You Can Do For Further Help:
Contact the Engineering and Service Department of the
OAKITE PRODUCTS CO., 675 Central Avenue, New
Providence, NJ 07974 U.S.A. (or visit www.oakite.com)
for the name and address of the service representative
in your area.