CleaverBrooks CBLE, Operation And Maintenance Manual

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Waterside Care and Requirements
3-6 750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
3.3.2 — Water Feeder (optional) Operation
Water feeder operation is usually applicable to boilers operating at 15 psi steam or less. It is only necessary to open
the water supply line valve and the water feeder discharge valve.
3.4 — Water Treatment
Properly treated boiler feed water, coupled with good engineering and operating practices, lead to maximum effec-
tiveness and long trouble-free life of pressure vessels, at the lowest operating cost. Contact your local Cleaver-
Brooks authorized representative for information on how to prevent the presence of unwanted solids and corro-
sive gasses.
Objectives of water treatment in general are:
•
Prevent hard scale deposits or soft sludge deposits, which reduce heat transfer and can lead to overheated metal
and costly downtime and repairs.
•
eliminate corrosive gasses in the supply or boiler water.
•
Prevent intercrystalline cracking or caustic embrittlement of boiler metal.
•
Prevent carryover and foaming.
Accomplishment of the above objectives generally requires proper feedwater treatment before and after introduc-
tion of the water into the boiler. The selection of pre-treatment processes depends upon the water source, its
chemical characteristics, amount of makeup water needed, plant operating practices, etc. Treating methods include
filtering, softening de-mineralizing, deaerating, and preheating. After-treatment involves chemical treatment of the
boiler water.
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. Sound recommendations and their employment should be aug-
mented by a periodic analysis of the feedwater, boiler water, and condensate.
The internal or waterside surfaces of the pressure vessel should be inspected with enough frequency to determine
the presence of any contamination, accumulations of foreign matter, corrosion, and/or pitting. If any of the condi-
tions are detected, contact your local Cleaver-Brooks authorized representative for advice on corrective action.
NOTE: In the event that water column isolation valves are provided or installed, it must be established that the valves
are open and seated or locked in the open position. If the valves are installed, it is illegal to operate the boiler with
closed or unsealed open valves.
The isolation valves and the water column piping must be locked open during operation. Failure to do so may result in
a low water condition. Failure to follow these instructions could result in serious injury or death.
!
Warning