gasketed groove in the channel cover are prohibited. Materials of
construction shall be all carbon steel except the tubes. Pressure boundary
material shall be in accordance with ASTM A 516/A 516M, Grade C, when plate
material is required, or ASTM A 350/A 350M when forging material is
required. Shroud plate material for desuperheating and subcooling zones
shall be in accordance with ASTM A 285/A 285M, Grade C. Tubes shall be
stainless steel in accordance with ASTM A 688/A 688M, Grade TP 304, stress
relief annealed temper with U-bends stress relieved after bending. Shell
shall be coated on the outer surfaces with an approved rust-inhibiting
paint. Coils shall be designed for a working pressure of [_____] kPa psig.
[A heat exchanger shall also be employed to reduce the temperature of
high-pressure condensate by heating domestic or boiler feedwater, to
prevent excessive flashing in the condensate tank.]
2.6
DEAERATING FEEDWATER HEATER
Deaerating feedwater heater shall be installed where indicated and shall be
the size and capacity indicated. Shell shall be steel plate. [Tray system
for a Type I unit shall be corrosion-resistant steel.] Floats shall be of
[copper] [corrosion-resistant steel]. Overflow control shall be a [loop
seal] [float-controlled overflow trap]. A heater shall be provided with a
pressure relief valve, thermometers, pressure gauge, and oil separator. A
combination temperature-pressure recorder shall be installed for each
feedwater heater. Steam pressure readings shall be taken from the shell,
and the temperature bulb shall [indicate] [record] the temperature of the
feedwater after it passes over the trays and sprays. An alarm shall be
provided to turn on a red pilot signal lamp and to sound a bell in the
event that the water level in the feedwater heater storage tank falls to
300 mm 12 inches above the bottom of the tank. System shall be operated by
an approved type of external electric float switch connected to the tank.
Signal lamp and bell shall be mounted where directed. Float operator for
the deaerator level control valve shall be of the externally connected cage
type of semisteel construction and noncorrodible float, both designed for
858 kPa 125 psig working pressure, piped with shut-off and drain valves.
2.6.1
Design Conditions
The design conditions are:
a.
Outlet Capacity Design
[_____] kg per hour.
b.
Outlet Capacity - Operating
[_____] kg per hour.
c.
[_____] kPa.
d.
Design Pressure
[_____] kPa.
e.
Storage Tank Cap
[_____] L (Normal Level) at
centerline.
f.
Operating Temperature
[_____] degrees C.
g.
Pumped Condensate - Operating
[_____] kg/hour at degrees C liq.
h.
Pumped Condensate - Design
[_____] kg/hour at degrees C liq
(min temp).
i.
Makeup steam - Operating
[_____] kg/hour kPa (2.79 MJ/kg).
SECTION 15846A
Page 42
Previous Page
