j.
Provide automatic control system to control level in condensate
tank by modulating discharge from condensate pumps.
2.14.2
Deaerating Heater
Provide a deaerating feedwater heater with storage tank conforming to FS
W-H-2904, except as modified below and to ASME BPVC SEC VIII.
Tank shall
be ASME Code stamped. Provide stainless steel trays. No test model will
be required.
Model A - Pressurized operation.
Type I - Tray-type heating and deaerating element.
Class 3 - 10 minute water storage capacity (minimum).
Grade A - Guaranteed removal from water of dissolved oxygen in excess
of 0.005 cubic centimeters (cc) per liter, over a ten to one load
swing.
2.14.2.1
Heater Capacity
Provide deaerating heater capable of heating and deaerating makeup water
consisting of [_____] kilograms per second (kg/sec) pounds per hour of
softened makeup water from [_____] to [_____] degrees C F (outlet
temperature).
2.14.2.2
Inlet Water Characteristics
Softened makeup water:
Ph: [_____]
Total hardness (as CaC03):
[_____]
2.14.2.3
Storage Tank
Horizontal design with steel supports [drilled for bolting] of approved
design.
Provide storage tank with not less than a 410 by 510 mm 16 by 20
inch minimum size manhole and cover and provide heater section with not
less than a 300 by 460 mm 12 by 18 inch minimum size tray access handhole
and door.
2.14.2.4
Vent Condensing Arrangement
Provide the deaerating heater with a vent condenser which shall condense
the vented steam when the heater is operating at full capacity with the
inlet water mixture at a temperature not exceeding 82 degrees C 180 degrees
F. Construct the vent condenser, when of the direct contact type, with
stainless steel baffling.
2.14.2.5
Materials
Construct trays, tray supports, water distributors, and other parts coming
in contact with undeaerated water or air laden steam of 430 stainless steel.
2.14.2.6
Accessories
Provide the deaerating heater unit with the following accessories:
a.
Pressure relief valve:
Sized in accordance with FS W-H-2904.
b.
Thermometers:
Two, 125 mm 5 inch dial thermometers, 10 to 149
SECTION 15502N
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