750-368
CBEX Elite 100-1200 HP
3-7
3.5 — Boil-Out of a New Unit
2. Partial or total old system is involved.
3. Conditions may prevent adequate cleaning of piping.
The pressure vessel waterside should be inspected on a periodic basis. An inspection will reveal true internal
conditions and serve as a check against conditions indicated by chemical analysis of the boiler water. Inspection
should be made three months after initial starting and at regular 6-, 9-, or 12-month intervals thereafter. The fre-
quency of further periodic inspections will depend upon the internal conditions found.
If any unwanted conditions are observed, contact your local Cleaver-Brooks authorized representative for recom-
mendations.
Any sludge, mud, or sediment found will need to be flushed out. If excessive mud or sludge is noticed during
blowdown, the scheduling or frequency of blowdown may need to be revised. The need for periodic draining or
washout will also be indicated.
Any oil or grease present on the heating surfaces should be removed promptly by a boil-out using an alkaline
detergent solution.
3.5 — Boil-Out of a New Unit
The internal surfaces of a newly installed boiler may have oil, grease or other protective coatings used in manu-
facturing. Such coatings must be removed because they lower the heat transfer rate and could cause overheating
of a tube. Before boiling out procedures may begin, the burner should be ready for firing. The operator must be
familiar with the procedure outlined under burner operation.
Your local Cleaver-Brooks authorized representative will be able to recommend a cleaning or boil-out procedure.
In the event such service is unavailable or is yet unscheduled, the following information may be of assistance.
There are several chemicals suitable for boil-out. One combination often used is soda ash (sodium carbonate)
and caustic soda (sodium hydroxide) at the rate of 3 to 5 pounds each per 1,000 pounds of water, along with a
small amount of laundry detergent serving as a wetting agent.
The suggested general procedure for cleaning a boiler is:
1. Refer to the table below to determine water capacity. Have sufficient cleaning material on hand to complete
the job.
NOTE: Temperature of initial fill of water for hydrostatic tests, boil-out, or for normal operation should be as stated in
the ASME Boiler Code.
Use of a suitable face mask, goggles, rubber gloves, and protective garments is strongly recommended when han-
dling or mixing caustic chemicals. Do not permit the dry material or the concentrated solution to come in contact
with skin or clothing. Failure to follow these instructions could result in serious injury or death.
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