k.
Outer casing shall be weatherproof with a minimum 7.5 mm 22 gauge
corrugated galvanized carbon steel lagging. Exposed surfaces not
enclosed by outer casing shall be painted with high temperature
aluminum paint.
l.
Minimum 20 mm 3/4 inch vent and drain connections shall be
provided on feedwater headers.
m.
Economizer shall be provided with electrically operated soot
blowers. The quantity of the soot blowers shall be as recommended
by the manufacturer. Soot blowers shall be installed transversely
to provide maximum cleaning capabilities.
n.
Access door of carbon steel construction shall be provided in the
economizer design. Access door shall be insulated.
o.
The economizer shall be designed to accept piping reactions
without distortion or creating overstressed conditions in the
piping.
2.3.6
Firetube, Package Type Steam Boiler
Boiler pressure vessel shall be constructed and stamped in accordance with
the rules of Section 1 of the ASME BPVC SEC I ASME manufacturer's data
reports shall be executed by the manufacturer and an authorized inspector
who holds a valid commission issued by the National Board of Boiler and
Pressure Vessel Inspectors prior to shipment. ASME manufacturer's data
shall be furnished to the Contracting Officer, the inspection agency and
the state and local authorities at the place of installation. Pressure
vessel shall be stamped for 1030 kPa 150 psig design pressure.
2.3.6.1
Heating Surface
Boiler furnace tube shall have its centerline below the boiler centerline
for maximum water coverage. Boiler shall have a minimum of 0.465 square
meters 5 square feet of fireside heating surface per rated BHP. Furnace
shall be large enough for complete combustion of fuel at maximum capacity
without flame impingement. Heating surface shall be fully accessible for
inspection and cleaning without disturbing the burner equipment.
Observation and sight ports shall be located at each end of the boiler to
allow inspection of flame conditions. A rear access opening with
observation port shall be provided. Handholes and manholes shall be
provided in accordance with ASME BPVC SEC I.
2.3.6.2
Boiler Firetubes
Boiler firetubes shall be not less than 50 mm 2 inches in diameter,
seamless steel tubing expanded to the tube sheets. Welded welded firetubes
are not acceptable.
2.3.6.3
Flue Gas Exhaust
Flue gas exhaust connection and stack thermometer shall be located on the
top centerline. Boiler flue outlet shall be furnished with a manual cast
iron locking damper.
SECTION 15561A
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