750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
3-7
3.5 — Cleaning
A properly sized water meter should be installed in the raw water make-up line in order to accurately determine the
amount of raw water admitted to the boiler (steam or hot water) and to aid in maintaining proper waterside condi-
tions.
3.5 — Cleaning
3.5.1 — Hot Water and Steam Piping
Steam and water piping systems connected to the boiler may contain oil, grease, or foreign matter. The impurities
must be removed in order to prevent damage to pressure vessel heating surfaces. On a steam system, the conden-
sate should be wasted until tests show the elimination of undesirable impurities. During the periods that condensate
is wasted, attention must be given to the treatment of the raw water used as make-up so that an accumulation of
unwanted materials or corrosion does not occur. For more information, contact your local Cleaver-Brooks autho-
rized representative.
On a hot water system, chemical cleaning is generally necessary and the entire system should be drained after treat-
ment. Consult your local Cleaver-Brooks authorized representative for recommendations, cleaning compounds,
and application procedures.
3.5.2 — Pressure Vessel
The waterside of the pressure vessel must be kept clean from grease, sludge, and foreign material. Such deposits, if
present, will shorten the life of the pressure vessel, will interfere with efficient operation and functioning of control
of safety devices, and quite possibly cause unnecessary and expensive re-work, repairs, and downtime.
The installation and operating conditions that the boiler will be subjected to should be considered and cleaning of
the waterside of the pressure vessel should be provided during the course of initial start-up.
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:
• Cleaning has been inadequate.
• Partial or total old system is involved.
• 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 you local Cleaver-Brooks authorized representative for recom-
mendations.
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