Chapter 7—AUXILIARY MACHINERY
WARNING: Protective clothing shall be worn while pouring concentrated chemicals into chemical
injection tank and while topping off.
GENERAL PROCEDURE FOR ADDING CHEMICAL (ASSUMING VALVES SET FOR NORMAL
OPERATION, i.e., VALVES 1,2,3 OPEN AND VALVES 4,5,6,7,8 CLOSED).
1. Slowly open valves 7 (drain), 6 (overflow/vent), and then 5 (funnel fill).
2. Close valve 7.
3. Charge the injection tank with treatment chemicals already in solution through
the funnel.
4. Top off tank with feedwater obtained in bucket until an overflow just starts.
5. Close valves 5 and 6.
6. Open valves 4 and 8.
7. Close valve 1.
8. Maintain a flow of water for 10 minutes to wash out the injection tank.
INJECTION TANK SECURING PROCEDURE
1. Open valve 1.
2. Close valves 4 and 8.
3. Drain injection tank by first slowly opening valve 7 and then valve 6.
4. Close valves 6 and 7.
121.54
Figure 7-3.—Auxiliary Boiler Chemical Injection Procedure.
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