750-382
CBT
2-3
Water Treatment
The CBT boiler requires soft water. Failure to observe this requirement can lead to dangerous
operating conditions, and may result in damage to the boiler. If necessary, your Cleaver-Brooks representative
can provide additional information regarding your water softening requirements.
The objectives of water treatment in general are to:
1. Prevent hard scale and soft sludge deposits that inhibit heat transfer and that could lead to overheated metal
and costly downtime and repairs.
2. Eliminate corrosive gases in the supply or boiler water.
To accomplish these objectives, the boiler requires proper water treatment before and after introduction of water
into the unit. The selection of pretreatment processes depends upon the water source, its chemical characteristics,
the amount of makeup water needed, system operation practices, etc.
Because of the variables involved, no single boiler compound can be considered a cure-all; nor is it advisable to
experiment with homemade treating methods. A sound treatment program should include a weekly analysis of the
water in the system.
The internal or waterside surfaces of the pressure vessel should be inspected at regular intervals for evidence of
corrosion, pitting, contamination, or accumulations of foreign matter. If any of these conditions are detected,
contact your local Cleaver-Brooks authorized representative for advice on corrective action. It is recommended that
a properly sized water meter be installed in the raw water makeup line to accurately determine the amount of raw
water admitted to the boiler.
Surface blow-off is available for steam boilers. This option allows removal of surface water impurities through a
blowdown line located at the normal operating water level of the boiler. If allowed to accumulate, surface
impurities may impede steam release and could cause foaming, leading to priming and carryover in the steam
lines.
Corrosion and sludge deposits in old systems must be removed prior to installation of a new boiler.
Table 2-1. CBT water quality
QUANTITY LIMITS
Oxygen <0.005 ppm
CO2 0 ppm
Hardness <2.0 ppm
Suspended Solids <300 ppm
pH 8.5 - 10.5
Sulfite >50 ppm
Fe <0.1 ppm
Silica <150 ppm
Total Alkalinity <700 ppm
Dissolved Solids <3,000 ppm
Important
!
!
Warning
Inadequate or improper water treatment will shorten the life of the
boiler and could result in a hazardous condition.
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