e.
Deaerator stand shall be steel fabricated of appropriate height
for the feed pump-motor set, and mounted on a solid base. The
base shall be reinforced to prevent vibration.
f.
Nozzles 100 mm 4 inches and under shall be 1350 kg 3000 pounds
forged steel couplings. Nozzles 63.5 mm 2-1/2 inches and over
shall be 1.03 MPa 150 psig rated flat face flanges.
g.
Pump-motor set shall be mounted on individual base before mounting
on the stand base. Individual suction piping, including strainer,
shutoff valve and flexible connector, shall be provided for pump.
Pump suction nozzle shall be provided with vortex breakers to
eliminate loss in NPSH and cavitation. Connections shall be as
shown.
h.
Interior of the tank shall be factory-lined with high quality
baked epoxy lining. Lining shall be applied to white metal
surface in accordance SSPC SP 5. Four to six coats shall be
applied with each dry coat being approximately 0.38 mm 1.5 mils
dry, for a total thickness of 0.152 mm 6 mils dry minimum.
Lining shall be holiday spark tested using low voltage and a wet
sponge to ensure uniform coating free of pin holes.
i.
Exterior shall be primed with a high heat silicone acrylic primer,
0.05 mm 2 mil minimum DFT.
2.7.1.3
Deaerator, Atomizing Spray-Type
Deaerator shall be atomizing spray-type, pressurized horizontal type.
Heads shall be ASME torospherical type constructed of ASTM A 516/A 516M GR
70 carbon steel with a minimum thickness of 6.35 mm 0.25 inch. Shell plate
shall be fabricated of ASTM A 36/A 36M carbon steel with minimum thickness
of 6.35 mm 0.25 inch. Main deaerating portion, located internally, shall
consist of water collector and steam atomizing valve. Spring loaded water
spray nozzle which includes automatic and manual vent valves shall be built
into a flange on top of the tank.
2.7.1.4
Deaerator, Tray-Type
Deaerator shall be tray-type with spray manifold in a 300 Series stainless
steel deaeration dome with integral cascade trays, pressurized horizontal
type. Deaeration dome with integral cascade trays containing a spray
manifold with stainless steel spray nozzles shall be flange mounted to the
boiler feed receiver. Spray manifold shall be flange mounted to the dome.
Flange opening shall be large enough to permit the manifold to be easily
withdrawn for servicing. Direct injection steam heating assembly shall be
installed in the receiver. Heating assembly shall consist of double flange
mounted injection pipe, steam control valve, pressure-temperature
regulator, wye strainer and pressure gauge.
2.7.1.5
Deaerator, Atomizing Spray Two-Tank Type
a.
Deaerator shall be atomizing spray-type two-tank, divided into two
separate sections. Deaerator water storage and condensate surge
sections shall be divided by a double inner head. Air space
between 2 inner spaces shall be packed with fiberglass insulation
and shall have a breather and drain connections. Shell plate
shall be fabricated of ASTM A 36/A 36M carbon steel with minimum
SECTION 15561A
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