a.
Controllers: Provide external cage type air operated level
controllers for both the condensate and makeup water lines
complete with 40 mm 1 1/2 inch screwed connections, external cage,
and controller. Cage body shall be Class 125 cast iron
construction. Internal components including displacer, torque
tube, displacer rod, displacer rod driver and bearings shall be
316 stainless steel. Displacer shall be 356 mm 14 inches long.
Controller shall be direct acting with 20 to 103 kPa (gage) 3 to
15 psig range with proportional band adjustment. Locate
controller to maintain an operating level at 2/3 full point of
storage tank. Provide level controller with air pressure reducing
valve, filter, gages and isolating valves for float cage. Provide
unions on each side of float cage.
b.
Air operated regulating valves: Provide air operated control
valves for both the condensate and makeup water lines. Valves
shall have Class 125 or Class 150 rating with iron or semi-steel
bodies and 316 stainless steel internals. Provide open on air
failure condensate valve and provide makeup water valve with an
air lock mounted on valve diaphragm and piped to hold valve in
last position on air failure. Design valves for the following
conditions:
Condensate
Makeup Water
(1)
Valve size
[_____]
[_____]
(2)
Capacity (L/s)
[_____]
[_____]
(3)
Maximum pressure drop
at above capacity
(kPa (gage))
[_____]
[_____]
(4)
Available pressure
kPa (gage)
[_____]
[_____]
(5)
Minimum Cv at 100
percent open
[_____]
[_____]
Condensate
Makeup Water
(1)
Valve size
[_____]
[_____]
(2)
Capacity (gpm)
[_____]
[_____]
(3)
Maximum pressure drop
at above capacity (psig)
[_____]
[_____]
(4)
Available pressure psig
[_____]
[_____]
(5)
Minimum Cv at 100
percent open
[_____]
[_____]
2.14.2.9
Low Pressure Steam Control
Provide an automatic control system to control the steam to the deaerating
feedwater heater. Maintain steam pressure in the heater by modulating a
pressure reducing valve in the steam supply line. Control shall be local
SECTION 15502N
Page 148
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