no less than 115 percent of design head. Design point capacity on
the selected pump curve shall be within 25 percent of capacity at
best efficiency point for impeller diameter selected to meet
design point conditions. Minimum flow required for continuous
pump operation shall not be greater than 30 percent of specified
design flow for each pump.
c.
Pump shall have efficiency of 50 percent or greater at rated
capacity.
2.8.3
Sump Pump
Sump pump shall be provided for sump pit shown. Sump pump shall be heavy
duty, upright type, certified by the Sump and Sewage Pump Manufacturers'
Association.
2.8.3.1
Design Conditions
Motor Power, kW
[_____]
Minimum capacity (including suction and friction losses).
[_____] L/hr at head of [_____] m [_____] gph at head of [_____] feet
Shutoff head of [_____] m feet
Maximum fluid temperature [_____] degrees C degrees F
2.8.3.2
Construction
Bronze fitted cast iron volute with non-clogging cast bronze impeller and
stainless steel sediment screen. Upright column shall be brass. Discharge
connection shall be ISO NPT. High efficiency non-clogging impeller shall
be furnished with stainless steel shaft journal and bearing suitably
designed for intended service.
2.8.3.3
Backwater Valve
A backwater valve shall be provided in the pump discharge.
2.8.3.4
Float Switch
Float switch shall be actuated by an adjustable copper float mounted on
stainless steel rod.
2.8.4
Pump Drive
**************************************************************************
NOTE: Delete the Steam Turbine Drives paragraph if
all-electric motor drives are used and the Electric
Drives paragraph if all-steam turbine drives are
used.
**************************************************************************
2.8.4.1
Steam Turbine Drive
Steam turbine drive shall be rated for the specified operating conditions
and designed in accordance with NEMA SM 23. Turbine shall be of the single
or multiple valve design and utilize impulse type blading. Flexible
SECTION 15561A
Page 85
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