angle or straight-way type and shall operate without chattering, hammering,
or sticking. Valves shall be cast steel.
2.3.1.7
Feedwater Regulator
Feedwater regulator, sized for the application, shall be connected
complete with all necessary piping and accessories for automatic operation.
Valved bypass shall be provided around the control valve. Units shall be
provided with a device to lock the regulator in existing position in case
of power failure. Unit shall be provided with a manual/automatic selector
panel located on the instrument panel in the control room. The feedwater
control element shall be provided with a drain valve. The feed-water line
shall be fitted with a thermometer well. Mechanical linkages and chains to
position the valve will not be allowed. Feed-water piping shall conform to
the requirements of ASME BPVC SEC I. A hand wheel or a manual jacking
device shall be provided to permit manual operation of the regulator valve.
2.3.1.8
Soot Blowers
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NOTE: Soot blowers should be required for all
boilers when solid fuel is burned, and are advisable
when burning No. 6 fuel oil. If only gas or No. 2
fuel oil is being burned, this paragraph may be
deleted. Soot blowers are available for fire-tube
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Soot blowers shall be provided in conjunction with the heat recovery or
boiler section of each solid fuel fired steam generation system. Soot
blower or cleaning nozzles shall be furnished in sufficient numbers,
permanently mounted, and so arranged or spaced to effectively clean all
tube surfaces. Each soot blowing system shall be an automatic sequencing,
flexible operation using air or steam as the blowing medium. Elements
within the boiler shall be constructed of heat-resisting alloys suitable
for the flue gas temperature encountered and shall be removable without
disturbing the boiler tubes. If the soot blowers are air operated, air
compressors with sufficient capacity to accommodate the additional load of
the soot blowers shall be provided. [Each boiler unit shall include a
cyclone separator installed in conjunction with the boiler stack to capture
particulate matter emitted during tube cleaning operations.] Frequency of
the cleaning operation shall be automatically controlled by timers that
shall be interlocked with the inspection doors to prevent cleaning when the
doors are open. Each blower unit shall be furnished complete with all
necessary auxiliaries, controls, and equipment and shall be connected
according to the manufacturer's recommendations.
2.3.1.9
Drains
Drains consisting of a 20 mm 3/4 inch hose bib or a 25 mm 1 inch hose gate
valve shall be installed at the lowest point in the return main near the
boiler and at locations shown or as required for the convenient and
thorough draining of the system.
2.3.2
Economizers
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NOTE: The economizer or air preheater will be
selected to be compatible with any pollution control
SECTION 15846A
Page 30
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