and remote from the control panel.
a.
Controller: Adjustable proportional band, 0 to 103 kPa (gage) 0
to 15 psig brass bellows for input signal, and 20 to 103 kPa (gage)
3 to 15 psig output air pressure range, pilot controller complete
on control valve yoke.
b.
Pressure reducing station control valve: Provide a [_____] mm inch
air operated pressure reducing valve with proper internals to
pass a flow of [_____] kg per second pounds per hour of steam.
Steam at the valve inlet shall be [_____] kPa (gage) psig
saturated, and the outlet shall be controlled at [_____] kPa (gage)
psig. Minimum steam flow shall be approximately [_____] kg per
second pounds per hour. Minimum valve Cv shall be [_____] at 100
percent open. Valve shall be Class 250 or Class 300 flanged, iron
or semi-steel body with stainless steel internals equal percentage
flow characteristics and a full size port. Provide valve actuator
including travel indicator, hand jack, valve positioner, and air
supply filter-reducer set. Valve shall move to open position in
case of failure.
2.14.2.10
Gage Glasses
Provide to cover the entire range of water level in the storage section.
Gage glasses shall not be greater than 610 mm 24 inches center-to-center.
Provide gage glasses complete with [chain operated] ball check shutoff and
drain cock valves and safety shield.
2.14.2.11
Alarms
Provide high and low water level alarms for storage tank as follows:
a.
High water level alarm: Switch with stainless steel float and
trim. Locate switch to close circuit when water level rises to 25
mm one inch below overflow level of storage tank.
b.
Low water level alarm: Switch with stainless steel float and
trim.
Locate switch to close circuit when water level falls to
[_____] meters feet [_____] mm inches above bottom of storage tank.
c.
Coordinate alarms with annunciator panel as indicated.
2.14.2.12
Capable of relieving not less than [_____] kg per second pounds per hour of
steam with not more than a [_____] kPa (gage) psig pressure rise when set
by means of an external handwheel or chain operator for an initial set
pressure of 0 to 172 kPa (gage) 0 to 25 psig. Locate on low pressure steam
header manifold for the deaerating heater. Valve shall be multiport vapor
cushion type rated for operating temperatures up to but not greater than
149 degrees C 300 degrees F with Class 125 cast iron body, bronze trim and
carbon steel springs.
2.14.2.13
FS A-A-50494, Type [I (cast iron)] [II (fabricated steel plate)] of [_____]
mm inch size with [_____] mm inch diameter drain, and a capacity of [_____]
SECTION 15502N
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