on boilers under 2930 kW 10,000,000 Btu/h. However,
smoke density recorders are mandatory for all
residual oil fired boilers having capacities above
2930 kW 10,000,000 Btu/h.
**************************************************************************
d.
A smoke density [indicator] [recorder] of the [density limit]
[continuous density] type with a scale calibrated in Ringlemann
units. Indicating and recording systems shall include circuits
for the audible warning of the maximum smoke density-limit.
Supply a vibrating electric horn to sound the audible signal.
Otherwise the smoke density [indicator] [recorder] shall conform
to MIL-M-29190.
2.1.3
Boiler Plant Controls and Instruments
Provide the following plant [controls and] instruments:
a.
Orsat Gas Analyzer : Provide a flue gas analyzer, Orsat type,
conforming to FS A-A-50504. Analyzer shall determine the CO2, CO,
and O2 in the flue gas and shall be complete with chemicals and
accessories for use in such determinations.
b.
Steam flow recorder: to remotely indicate, record, and totaling
the steam flow per hour through the steam header. Provide the
panel-mounted indicating recorder with a tamper proof case.
**************************************************************************
NOTE: Insert section number(s) for oil and/or gas
piping systems in the blanks below.
**************************************************************************
c.
Volumetric fuel flow meters in accordance with [_____] [and
[_____]].
**************************************************************************
NOTE: The value of tolerance limit shall be 3
percent for modulating positioning type, shall be 5
percent for high/low/off type, and shall be 6
percent for on/off type. See paragraph 3 for which
type of combustion control is specified.
**************************************************************************
d.
Master Combustion Control: Provide a common boiler master
controller on the free standing boiler instrument and control
panel to control all boilers with each individual boiler
controller acting as a submaster controller. Boiler master
control system shall provide for base loading one [or more]
boilers. Base loaded boiler(s) 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. Provide adequate
indicators approved by the Contracting Officer to show the method
of loading of each boiler, and load being carried by it. Make
adjustments at front of panel and no linkage adjustment shall be
SECTION 15516N
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