c.
A flue gas analyzer, Orsat type, conforming to FS A-A-50504. The
analyzer shall determine the CO2, CO, O2 in the flue gas and shall
be complete with chemicals and accessories for use in such
determinations.
d.
A steam flow recorder which shall remotely indicate, record, and
totalize the steam flow per hour through the steam header.
Provide panel-mounted indicating recorder with a tamper-proof case.
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NOTE: Insert section numbers for oil and/or gas
piping systems in the blanks below.
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e.
Volumetric fuel flow meters in accordance with [_____], [and]
[_____].
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NOTE: Master combustion controller should be used
only for automatic recycling boilers.
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f.
A common boiler master combustion controller located on the free
standing instrument and control panel to control all boilers with
each individual boiler controller acting as a submaster
controller. The boiler master control system shall provide for
base loading one [or more] boilers. Base loaded boilers shall be
selected manually by an externally accessible switch. On call for
heat, lead boiler shall cut in and moderate firing rate to satisfy
demands. When maximum desired firing rate is reached, lag boiler
or boilers shall cut in. Only one boiler shall be on modulating
firing at one time. Maximum desired firing rate for base loaded
boiler shall be adjusted initially for boiler peak efficiency and
shall be capable of easy manual adjustment by operating engineer.
Adequate indicators shall be provided to show the method of
loading of each boiler, and load being carried by it. Make
adjustments at the front panel and no linkage adjustment shall be
necessary.
g.
The combustion control system shall be capable of maintaining the
plant steam pressure at the main header within the tolerance
limits of [_____] percent expressed as a percent of the set point
values. The specified tolerance shall apply to any load which,
within a one minute period, swings from a steady-state condition
to an increase (or decrease) in load equal to a maximum of 10
percent of the plant. Regulation tolerances shall apply to any
steady state condition within the plant turndown ratio of [_____].
After a load swing of 10 percent the concentration of oxygen in
the flue gas shall not vary more than plus or minus [_____]
percent of the values established at time of system set up within
a time period of 30 seconds for firing rates of or above 33
percent of maximum, and plus or minus [_____] for firing rates
below 33 percent of maximum. [For oxygen compensation, a
continuous analysis of flue gases leaving the boiler shall be made
and recorded by an oxygen indicator and recorder mounted on the
control panel. From this analysis, a signal shall be sent to the
fuel-air ratio system which shall be biased in response to the
signal to maintain the oxygen levels within plus or minus [10]
SECTION 15517N
Page 18
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