Chapter 1 General Description
1-2 750-177
B. The Boiler
The Cleaver-Brooks Model FLX is a five-pass steel boiler with flexible watertubes formed and arranged so as
to direct the flow of combustion gases through the boiler. The pressure vessel conforms to Section I or IV of
the ASME code. The pressure vessel consists of the formed tubes, the external downcomer, and the top and
bottom drums to which they connect. The heated area of the pressure vessel is contained within a gas tight
insulated casing that is composed of removable formed steel panels.
The boiler and related equipment installation are to be
in compliance with the standards of
the National Board
of Fire Underwriters. Installation should also conform to
state and local codes governing such equipment. Prior
to installation, the proper authorities having jurisdiction
are to be consulted, permits obtained, etc. All boilers
comply, when equipped with optional equipment, to
Industrial Risk Insurers (IRI), Factory Mutual (FM), or
other insuring underwriters requirements.
Always order genuine Cleaver-Brooks parts
from your local Cleaver-Brooks authorized
representative.
The Model FLX boiler is a packaged watertube boiler of welded steel construction and consists of a pressure
vessel, burner, burner controls, forced draft fan, damper, refractory, and appropriate boiler trim.
Steam
Steam boilers are designed for low and high pressure applications.
Low pressure boilers are limited to 15 psig
design pressure, and are typically used for heating applications. High pressure boilers are limited to 150 psig
design pressure, and are typically used for process steam applications.
Hot Water
Hot water is commonly used in heating applications with
the boiler supplying water to the system at 180 F
to 220 F. The operating pressure for hot water heating systems usually is 30 psig to 125 psig.
Steam and hot water boilers are defined according to design pressure and operating pressure. Des
ign pressure
is the maximum pressure used in the design of the boiler for the purpose of calculating the minimum
permissible thickness or physical characteristics of the pressure vessel parts of the boiler. Typically, the safety
valves are set at or below design pressure. Operating pressure is the pressure of the boiler at which it normally
operates. The operating pressure usually is maintained at a suitable level below the setting of the pressure
relieving valve(s) to prevent their frequent opening during normal operation.
The type of service that your boiler is required to provide has an
important bearing on the amount of waterside
care it will require.
Waterside care is of prime importance. For specific information or assistance with your water treat-
ment requirements, contact your Cleaver-Brooks service and parts representative. Failure to follow
t
hese instructions could result in equipment damage.
Feedwater equipment should be ready for use upon installation of the boiler. Be sure that all valves, piping,
boiler feed pumps, and receivers are installed in accordance with prevailing codes and practices.
The careful observance of water requirements for both stea
m and hot water boilers is essential. Constant
attention to water requirements will pay dividends in the form of longer life, less down-time, and prevention
of costly repairs.
Care taken in placing the pressur
e vessel into initial service is vital. The waterside of new boilers and new or
remodeled steam or hot water systems may contain oil, grease or other foreign matter. A method of boiling
out the vessel to remove accumulations is described in Chapter 3. The operator should be familiar with this
chapter before attempting to place the unit into operation.
ABC
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EFG
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