with capacity as indicated.
Access opening covers shall be hinged.
2.2.15
Boiler Internals
2.2.15.1
Internal fittings shall be securely mounted and demountable for boiler
access and cleaning and shall include but not be limited to:
a.
Boiler feedwater admission system to properly distribute feedwater.
b.
Chemical feed piping to permit infusion of caustic, phosphate, and
water mixture by continuous feed system.
c.
Continuous blowdown and water sampling system as combined unit.
d.
Intermittent blowoff system to properly collect mud from bottom
and permit drainage of boiler without water accumulation.
2.2.15.2
Outlet Fittings
Outlet fittings shall be flanged above 50 mm 2 inches. but may be threaded
for 50 mm 2 inches and smaller. [Note that all boiler systems (steam,
feedwater, and intermittent blowdown) operate into common headers serving
more than one generator.] All devices, designs, and piping methods shall
be in full accordance with applicable provisions of ASME BPVC SEC I for
pressure piping and shall be evidenced by proper certificates of work
performance and inspection.
2.2.15.3
Openings
Steam outlets, safety valves, and other valve openings in outer casing at
top of boiler shall be flashed or sealed in a manner to prevent water
leaking into the casing insulation.
2.2.15.4
Settling Chamber
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NOTE: Requirement for Settling Chamber is an option
depending on the fuel at the heat source.
**************************************************************************
Settling chamber for removal of fly ash, equipped with suitable means for
frequent cleaning without shutting down the boilers, shall be provided
below the last pass of each boiler.
2.2.16
Access Doors
Access doors in sufficient number, of adequate size, and properly located
shall be provided for cleaning, inspection, and repair of all areas in the
complete assembly. Doors shall be gas-tight and interior surfaces exposed
to direct radiant heat and high temperatures shall be lined with approved
refractory material to prevent excessive heat losses and warping of doors.
Doors too large or bulky for hand removal shall be hinged. At least one
observation port with cast-iron cover shall be provided on each door of the
boiler. An electrical interlock shall be provided to prevent the tube
cleaning system from operating unless the doors are closed and latched.
Door casing shall be of the same material and thickness as the adjoining
boiler casing. Door lining shall consist of 50 mm 2 inches of block
SECTION 15846A
Page 26
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