requirements shall include pump capacity of a
minimum of 135 percent of boiler requirements at
maximum load for modulating service and 200 percent
for on-off service. Discharge head must include all
change in elevation, friction losses through pipe,
valves and fittings and be sufficient to deliver
water to the boiler at a pressure 6 percent higher
than the setting of the lowest set boiler safety
valve.
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FS A-A-50562, Type II (boiler feed), Style 1 (horizontal split case), Class
[1 single] [2 multi-] stage except as modified below.Submit pump
characteristic curves superimposed on system curves at various pumping
rates, 20, 40, 60, 80, 100 percent capacity.
2.14.3.1
Pump Service Requirements
a.
Capacity: [_____] L/s gpm
b.
Pumping temperature: [_____] degrees C F
c.
Liquid pH: [_____]
d.
Discharge head: [_____] meters feet
e.
Available NPSH: [_____] meters feet
f.
In addition to the operating point established above, pump curve
shall run through the following points:
Capacity
Discharge Head
[_____] L/s
[_____] meters
[_____] L/s
[_____] meters
Capacity
Discharge Head
[_____] gpm
[_____] feet
[_____] gpm
[_____] feet
2.14.3.2
Construction
Bronze fitted including bronze impeller and impeller wear rings, and ASTM A
48M ASTM A 48, Class 30, cast iron casing. Provide casing with suction and
discharge gages in tapped openings. Mount each pump and prime mover on a
fabricated steel bed plate having a drip collection chamber with tapped
drain openings. Provide lifting attachments to enable equipment to be set
into its normal position and to enable pumps to be easily dismantled in
place.
2.14.3.3
Drives
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NOTE: The designer shall perform an economic
analysis and make a technical evaluation to
determine if the boiler feed or condensate pump
motors shall be provided with variable speed
control. Generally variable speed drives for pumps
SECTION 15501N
Page 126
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