2.2.6.6
Blowoff Connections
Bottom drum blowoff connection on boiler shall be [_____] mm inch diameter
and extended to outside of setting terminating with Class 250, tandem iron
body, flanged blowoff valves, and shall be in accordance with
ASME BPVC SEC I, Art. PG-59. Boiler water wall blowoff connections and
economizer inlet pipe blowoff shall be 40 mm 1 1/2 inch diameter and
extended to outside of setting and equipped with same type valves.
Provide stop valves for water column blowoff connections.
2.2.6.7
Miscellaneous Stop Valves
Provide stop valves for each connection to boiler near boiler; include
valves for soot blowers, chemical feed, vent, continuous blowoff, and
required drains.
2.2.6.8
Tube Cleaner
Provide one tube cleaner suitable for cleaning tubes of the boiler. Tube
cleaner shall operate on water at 1034 kPa (gage) 150 psig pressure. Tube
cleaner shall be complete with one motor, one wrench, one cutter head
assembled, one universal coupling for cutter head, two sets of cutters, two
sets of cutter pins, one set of arm pins, one set of keeper pins, one brush
with a set of refills, one tool box, and two 15 meter 50 foot lengths of
heavy duty hose with 20 mm 3/4 inch diameter pipe connections.
2.2.6.9
Wrenches
Provide special wrenches required for proper maintenance of equipment.
2.2.7
Boiler Limit Interlocks
Provide applicable boiler limit interlocks required by MIL-B-18796 and
connect to effect safety shutdown of the stoker [and oil burners].
Interlocks shall be compatible with and integrated into the instrumentation
system as specified.
2.2.8
Sootblowers
Provide the boiler [and] [economizer] [and air preheaters] with a
sootblowing system using [steam] [compressed air] for removing the deposits
of soot and fly ash from the heat transfer surfaces. Sufficient number of
blower elements shall be provided to adequately clean the heat transfer
surfaces. Fixed position, multi-nozzle rotating elements may be provided
in applications where flue gas temperatures do not exceed 982 degrees C
1800 degrees F. Retractable soot blowers shall be provided where flue gas
temperatures exceed 982 degrees C 1800 degrees F.
2.2.8.1
Fixed Position Soot Blowers (Steam)
Soot blowers shall be steam, fixed position, multi-nozzled, rotating,
valve-in-head type with electric motor operation to permit the proper
cleaning of the heat transfer surfaces with cam operated valves arranged to
automatically open the steam valve through the proper arc of rotation.
Cams shall be adjustable to give the proper operating arc or shall be
specifically designed for each location. Furnish and install soot blowers
complete, including valve-in-head blower heads, wall sleeve bushings, high
temperature elements, low temperature elements, [_____] volt, [_____] Hz.,
SECTION 15502N
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