Low Pressure Steam Control

Condensate

Makeup Water

Valve size

[______] mm

Capacity

[______] L/s

Maximum pressure drop

[______] kPa (gage) [______] kPa (gage)

at above capacity

Available pressure

[______] kPa (gage) [______] kPa (gage)

Minimum Cv at

[______]

100 percent open

Condensate

Makeup Water

Valve size

[______] inch

Capacity

[______] gpm

Maximum pressure drop

[______] psig

at above capacity

Available pressure

[______] psig

Minimum Cv at

[______]

100 percent open

2.9.2.10

Low Pressure Steam Control

Provide an automatic control system to control the steam to the deaerating

heater. Maintain steam pressure in the heater by modulating a pressure

reducing valve in the steam supply line. Control shall be local and remote

from the control panel.

a.

Controller: Adjustable proportional band, 0 to 103 kPa (gage) 15

psig brass bellows for input signal, and 20 to 103 kPa (gage) 3 to

15 psig output air pressure range, pilot controller complete with

air set (valve, filter, drier and pressure regulator) mounted 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.

2.9.2.11

Gage Glasses

Provide gage glasses to cover the entire range of water level in the

SECTION 15511N

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