draft/atmospheric burner,] electrical wiring, insulation, piping
connections, and protective jacket. The boiler shall be completely
assembled and tested at the manufacturer's plant. Boiler auxiliaries
including fans, motors, drives, and similar equipment shall be provided
with at least 10 percent excess capacity to allow for field variations in
settings and to compensate for any unforeseen increases in pressure losses
in appurtenant piping and ductwork. However, the boiler safety devices
shall not be sized for a 10 percent excess capacity. The boiler and its
accessories shall be designed and installed to permit ready accessibility
for operation, maintenance, and service. Boilers shall be designed,
constructed, and equipped in accordance with ASME BPVC SEC IV. Each boiler
shall be of the [firetube] [watertube] [cast iron] [condensing] type and
designed for [water] [steam] service as specified herein. The boiler
capacity shall be based on the ratings shown in HYI-005 or as certified by
the American Boiler Manufacturers Association, or American Gas Association.
2.1.1
Firetube Boiler
Boiler shall be self-contained, multipass, packaged type, complete with all
accessories, mounted on a structural steel base. When the boilers are
operating at maximum output, the heat output rates shall not be greater
than 21 Kw per square meter 6,700 Btu/hr per square ft of fireside heating
surface.
2.1.2
Watertube Boiler
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NOTE: Select between standard, finned, or
bent/flexible tube boiler. If bent or flexible tube
boilers are not selected, remove all references to
bent or flexible tube boilers. Standard water tube
boilers are steel tube boilers that have
historically been used for most heating
applications. Finned tube boilers are typically
small boilers (residential type) that utilize a
finned tube arrangement. Bent or flexible tube
boilers are steel tube boilers with bent tubes that
experience multiple water tube passes.
Bent/Flexible tube boilers typically require less
space than standard water tube boilers. The bent or
flexible tubes are also easier to replace than the
standard water tubes; however, the interior surface
of the tubes cannot be cleaned mechanically; they
can only be chemically cleaned. Bent or flexible
tube boilers also have a higher ratio of heat output
to heating surface area.
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The boiler shall be a [standard] [finned] [bent or flexible] type of water
tube boiler. Boiler shall be self-contained, packaged type, complete with
all accessories, mounted on a structural steel base. [The boiler heating
surface area for bent or flexible tube boilers shall be at least 0.03
square meters per kW 4 square feet per boiler horse power. Bent or
flexible tube boilers shall be provided with single or multiple downcomers
for circulation without the need for exterior pumping. The tubes for bent
or flexible tube boilers shall be designed for replacement without
requiring welding or rolling of tubes. Any special tools required for bent
or flexible tube removal or installation shall be provided with the boiler.]
SECTION 15569A
Page 17
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