750-96 (revised 2010)
Model CB Packaged Boiler Manual
2-9
2.6 — Boil-Out of a New Unit
2. When dissolving chemicals, the following procedure is suggested. Warm water should be put into a suitable
container. Slowly introduce the dry chemical into the water stirring at all times until the chemical is completely
dissolved. Add the chemical slowly and in small amounts to prevent excessive heat and turbulence.
3. An overflow pipe should be attached to one of the top boiler openings and routed to a safe point of discharge.
A relief or safety valve tapping is usually used.
4. Water relief valves and steam safety valves must be removed before adding the boil-out solution so that neither
it nor the grease which it may carry will contaminate these valves. Use care in removing and re-installing valves.
5. All valves in the piping leading to or from the system must be closed to prevent cleaning solution from getting
into the system.
6. Fill pressure vessel with clean water until the tops of the tubes are covered. Add the cleaning solution and then
fill to the top. The temperature of the water used in this initial fill should be at ambient temperature.
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 to boil and overflow until the water clears. Shut the burner down.
10. Let the boiler cool to 120º F or less, then drain using caution that the water is safely discharged.
11. Remove hand hole plates and use a high pressure water stream to wash the waterside surfaces thoroughly.
12. Inspect surfaces and if not clean, repeat the boil-out.
13. After closing openings and re-installing safety or relief valves, fill the boiler and fire until the water is heated to at
least 180º F to drive off any dissolved gases which might otherwise corrode the metal.
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 system.
On a steam system, the condensate should be wasted until tests show the elimination of undesirable impurities.
During the period that condensate is wasted, attention must be given to the treatment of the raw water used as
makeup so that an accumulation of unwanted materials or corrosion does not occur. Follow the advice of your
water treatment company.
On a hot water system, chemical cleaning is generally necessary and the entire system should be drained after
treatment. Consult water treatment companies for recommendations, cleaning, compounds, and application pro-
cedures.
Use of a suitable facemask, goggles, rubber gloves, and protective garments is strongly recommended when handling
or mixing caustic chemicals. Do not permit the dry material or the concentrated solution to come in contact with skin
or clothing.
NOTE:
Refer to Section 7.13 in chapter 7 for valve installation instructions.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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