by 3/16 inch thick steel plate. Provide plugged tee connection for
connection to remote steam gage.
2.2.4.5
Water Column
Provide a safety water column with high and low water alarm suitable for
the design pressure of the boiler. Column shall be complete with
three-chain-operated gage cocks, heavy duty inclined gage glass, and
quick-closing water gage valves having cross leavers and chains operated
from floor. Gage glass shall be readable from any point directly below
unit. Make connections to water column from boiler with extra strong steel
pipe and forged steel fittings. Provide crosses instead of tees or elbows,
with screwed plugs in open ends. Terminate bottom of water column and
water column gage glass with plug-type valves accessible from operating
floor. Provide screwed plugged connections in water column piping for
remote level indicator. Provide gate valves immediately below water column
and gage glass. Provide a suitable lamp fixture to illuminate water column.
2.2.4.6
Safety Valves
Provide not less than [_____] cast steel or cast iron body high capacity
safety valves to give a total steam relieving capacity in accordance with
the ASME BPVC SEC I requirements as to total boiler and water wall heating
surface. Valves shall be set with a set pressure of [_____] kPa (gage) psig,
[[_____] kPa (gage) psig] [, [_____] kPa (gage) psig] [and [_____] kPa
(gage) psig] respectively.
Valves shall have flanged inlet and outlet
connections.
2.2.4.7
Non-Return Valve
Provide a non-return valve on each boiler steam outlet. Valve shall be a
stop check angle body valve, flanged, [Class 250 cast iron] [Class 300
steel] body with handwheel shutoff, pressure operated disc and external
equalizer. Assembly for manual operation shall be outside screw and yoke
type.
2.2.4.8
Blowoff Connections
Bottom drum blowoff connection on boiler shall be [_____] mm inch diameter
and extended to outside of setting terminating with tandem flanged blowoff
valves as specified above. 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. Boiler blowoff
connections shall conform to the applicable requirements of ASME BPVC SEC I,
Part PG-59.
2.2.4.9
Miscellaneous Stop Valves
Provide stop valves near boiler for each connection to boiler; include
valves for soot blowers, chemical feed, vent, continuous blowoff, and
required drains.
2.2.4.10
Tube Cleaner
Provide one tube cleaner suitable for cleaning boiler tubes. 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
SECTION 15501N
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