6--11
T-334
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 accompa-
nied 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 circu-
late 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.
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.
5. Fill the tubes with this solution by filling from the bot-
tom. See Figure 6--9. Important: be sure to provide a
vent at the top for escaping gas.
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--9 Water-Cooled Condenser Cleaning -
Forced Circulation
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--10) filled with the solution and
attached to the coils by a hose can serve the same
purpose by filling and draining. The solution must
contact the scale at every point for thorough de-scal-
ing. Air pockets in the solution should be avoided by
regularly 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.
8. When de-scaling is complete, drain the solution and
flush thoroughly with water.
9. Following the water flush, circulate a 56.7 gram
(2 ounce) per 3.785 liter (1 U.S. gallon) solution of
Oakite No. 22 thru the tubes to neutralize. Drain this
solution.
10.Flush the tubes thoroughly with fresh water.
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