4-26
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 bottle
(See Figure 4-31) filled with the solution and attached to
the coils by a hose can serve the same purpose, by raising
and lowering of the bottle. The solution must contact the
scale at every point for thorough de-scaling, therefore
ensure that no air pockets exist, by regularly opening the
vent to release gas.
Keep flames away from the vent gases.
Centrifugal pump
30 GPM at 35’ head
Pump
Suction
Pump
support
Tank
Fine mesh
screen
Return
Remove water
regulating valve
Condenser
Globe
valves
Gas
vent
Close vent pipe
valve when pump
is running.
Priming
connection
Figure 4-30. Water-Cooled Condenser Cleaning ---
Forced Circulation
7. The time required for de-scaling will vary, depending
upon the extent of the deposits. One way to determine
when de-scaling has been completed is to titrate the
solution periodically, using titrating equipment 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. Next 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.
NOTE
If the 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.
11. Put the unit back in service and operate under
normal load. Check the head pressure. If normal, a
thorough de-scaling has been achieved.
What You Can Do For Further Help:
Contact the Engineering and Service Department of
the OAKITE PRODUCTS CO., 19 Rector Street, New
York, NY 10006 U.S.A. for the name and address of the
service representative in your area.
Fill condenser with
cleaning solution. Do
not add solution more
rapidly than vent can
exhaust gases caused
by chemical action.
Condenser
Vent
pipe
1” Pipe
5’ Approximate
3’ to 4’
Figure 4-31. Water-Cooled Condenser Cleaning ---
Gravity Circulation
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