CleaverBrooks 4WI - 3.5 - Boil-Out of a New Unit

Waterside Care and Requirements
3-8
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
The pressure vessel and the steam and return lines or hot water piping represent, in effect, a closed system.
Although the steam and return (condensate) lines or the hot water piping system may have been previously
cleaned, it is possible that:
1. Cleaning has been inadequate.
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 condi-
tions 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 frequency 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 blow-
down, the scheduling or frequency of blowdown may need to be revised. The need for periodic draining or wash-
out will also be indicated.
Any oil or grease present on the heating surfaces should be removed promptly by a boil-out using an alkaline deter-
gent 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 manufac-
turing. 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.
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.