CleaverBrooks CBLE, Operation And Maintenance Manual

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Waterside Care and Requirements
3-8 750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
Any sludge, mud, or sediment found will need to be flushed out. If excessive mud or sludge is noticed during the
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 with an alkaline deter-
gent solution.
3.6 — 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 over-heating 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.
Several chemicals are 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 added as a wetting agent.
The suggested general procedure for cleaning a boiler is (refer to Figure 3-4 to determine water capacity):
1.
Have sufficient cleaning material on hand to complete the job.
2.
When dissolving chemicals:
a) warm water should be put into a suitable container
b) slowly introduce the dry chemical into the water, stirring at all times until completely dissolved
c) 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 the valves. Use care in removing and reinstalling the valves.
(Refer to Chapter 8, section 8.-13 for valve installation instructions.)
5.
All valves in the piping leading to or from the system must be closed to prevent the cleaning solution form get-
ting into the system.
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 handling
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.
!
Warning