General Description Chapter 3
750-177 3-7
Pressure Vessel
Cleaning of the waterside of the pressure vessel should be done during the course of initial installation. The
waterside of the pressure vessel must be cleansed of grease, sludge, and foreign material. Such deposits will
shorten the life of the pressure vessel and interfere with the efficient operation and function of control or safety
devices. In addition, deposits might cause unnecessary and expensive rework, repairs, and downtime.
The pressure vessel and the hot water system represent in effect, a closed system. Although individual
components of the system may already have been cleaned, it is possible that:
• The cleaning was not adequate.
• An old system was partially or totally involved.
• Conditions may have prevented an adequate cleaning of the piping.
Therefore, it is recommended that the entire system be cleaned after installation of all components is
completed. The pressure vessel waterside should be inspected on a periodic basis. An inspection will reveal
the true internal conditions and will serve as a check against conditions indicated by chemical analysis of the
boiler water. An inspection should be performed 3 months after the initial start up, then at regular 6, 9, or 12
month intervals thereafter. The frequency of periodic inspections will depend upon the internal conditions
found, the particular installation, and the operating conditions that the boiler is subjected to.
If any deterioration or unusual conditions are observed, contact your local Cleaver-Brooks authorized
Representative for recommendations.
Table: 3-3 Water Capacity
Boiler Size 150-250 300-350 400-600 700-900 1000-1200
Water Capacity (US gal.) Hot Water 91 106 174 228 269
Water Capacity (US gal.) Steam - Flooded 194 215 293 464 562
G. Boilout
Any oil, grease, or other contamination found to be present on waterside heating surfaces should be removed
promptly by boiling out the unit with an alkaline detergent solution.
Note: Before boiling out, the burner must be ready for firing. Refer to CHAPTER 2 - Profire V Burner.
There are several chemicals suitable for boilout. 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.
If the system is to be cleaned with the boiler, consider the additional water content of the system in
determining the amount of chemical required. The water capacity of Cleaver- Brooks FLX Boilers is listed in
Table 3-3.
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