2.3
BOILER AND APPURTENANCES
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NOTE: Delete types of boilers that are not used.
Select appropriate fuels and fill in pressure and
temperature requirements. Select efficiency in the
upper 25 percent of the competitive range. Specify
efficiencies that correlate to the fuel(s) required.
Select applicable burner type and combustion
control system. To accommodate shipping limitations
or installation access requirements in existing
boiler plants,the boiler may be specified to be
knocked down and field assembled.
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2.3.1
Boiler
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NOTE: Coordinate turndown ratio with subparagraph
"Fuel Oil Burner" and subparagraph "Natural Gas
Burner" in paragraph FUEL BURNING EQUIPMENT.
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Boiler shall be provided as complete boiler-burner package, including
integral forced draft burner, boiler trim, refractory, controls, fuel train
and accessory components. Boiler-burner package shall be provided [fully
assembled] [field assembled] ready for floor mounting and connection to
steam, feedwater, electrical, [fuel oil], [natural gas], vent, chemical
feed, blowdown and control lines in accordance with the Setting Plans.
Boiler shall have the capacity indicated. Equipment design and accessory
installations shall permit accessibility for maintenance and service.
Boiler shall comply with NFPA 8501, including recommended procedures and
advisory provisions. Boiler shall be designed for working pressure of
[_____] kPa psig and operating pressure of [_____] kPa [_____] psig. Each
boiler shall be capable of continuously producing [_____] kg pounds per
hour saturated steam [_____] degrees C degrees F while being supplied with
[_____] degrees C degrees F feedwater. Boiler operation shall be stable at
a turndown ratio of [_____]. [Natural gas] [fuel oil] [combination natural
gas fuel oil] burners shall be of type, size and so located and arranged
that in no case shall the flame impinge on any surface in the boiler nor
shall the flame extend beyond the limits of the furnace.
2.3.2
Performance
Boiler shall have the specified capacity at the operating pressure,
feedwater temperature and boiler site elevation specified. Capacity shall
be based on the evaporation rate in kilograms pounds per hour at boiler
specified outlet steam temperature and pressure while firing [No.[_____]
fuel oil] [natural gas] [No. [_____] fuel oil or natural gas]. [Fuel oil
supply temperature and pressure shall be [_____] degrees C degrees F and
[_____] Kpa psig]. [Natural gas supply pressure shall be [_____] kPa psig
]. Boiler shall be capable of continuous operation at full rated capacity.
Minimum efficiency shall be not less than [_____] percent when fired
continuously at full rated capacity with [natural gas] [fuel oil] [natural
gas or fuel oil]. Stable firing and efficiency shall both be maintained
over the entire firing range required by the turndown ratio. Output
capacity of the boiler shall be based on tests of the boiler and burner as
a unit. Moisture in the steam shall not exceed 0.5 percent at maximum
continuous rated boiler capacity and during a load swing of 10 percent of
SECTION 15561A
Page 27
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