750-392
CBEX-DE
2-7
Boil-Out of a New Unit
2. All valves in the piping leading to or from the system must be closed to prevent the cleaning solution from get-
ting into the system.
3. When dissolving chemicals:
A. Put warm water into a suitable container.
B. Slowly introduce the treatment chemical into the water.
C. Add the chemical slowly and in small amounts to prevent excessive heat and turbulence.
4. Water relief valves and steam safety valves must be removed before adding the boilout solution so that neither
the boilout solution nor the grease the solution may carry will contaminate the valves. Use care in removing
and reinstalling the valves.
5. An overflow pipe should be attached to one of the top boiler openings and routed to a safe point of discharge.
The safety valve tapping is usually used.
6. Fill the pressure vessel with clean water at ambient temperature until the top of the tubes are covered. Add
the cleaning solution, slowly and in small amounts, and then fill to the top with water.
7. The boiler should then be fired intermittently at a low rate sufficient to hold solution just at the boiling point.
Boil the water for at least five hours. Do not produce steam pressure.
8. Allow a small amount of fresh water to enter the boiler to create a slight overflow that will carry off surface
impurities.
9. Continue the boil and overflow process until the water clears. Shut the burner down.
10. Let the boiler cool to 120º F or less.
11. Remove handhole plates and wash the waterside surfaces thoroughly using a high pressure water stream.
12. Inspect the surfaces. If they are not clean, repeat the boilout.
13. After closing the handholes and reinstalling the safety or relief valves, fill the boiler and fire it until the water is
heated to at least 180º F to drive off any dissolved gases, which might otherwise corrode the metal.
14. Local authorities and chemical supplier should be consulted as to boil out chemical disposal.
The above procedure may be omitted in the case of a unit previously used or known to be internally clean. How-
ever, consideration must be given to the possibility of contaminating materials entering the boiler from the sys-
tem.
Be sure to drain the hot water to a safe point of discharge to avoid scalding. Failure to follow these instructions could
result in serious injury or death.
NOTE: For new installations, refractory heat-curing can be accomplished at the same time as the boil out. Total firing
time (firing intermittently at a low rate) should be 6-8 hours. The heat curing procedure is essential to prevent dam-
age and cracking in the boiler refractory.
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