2.15.3.1
Testing
Each pump shall be tested at the manufacturer's plant for operating
characteristics at the rated capacity and under specified operating
conditions. Test curves shall be furnished showing capacity in L/second gpm,
head in meters feet, efficiency, brake wattage horsepower, and operation in
parallel with similar pumps. Multiple pump installations shall have pump
characteristics compatible for operation in parallel with similar pumps.
The electric motor shall be of a size that will not be overloaded when
operating at any point along the characteristic curve of the pump. Guards
shall shield exposed moving parts.
2.15.3.2
Controls
Each pump motor shall be provided with enclosed across-the-line type,
magnetic controller complete in a NEMA 250, Type 1 enclosure with
three-position, "HAND-OFF-AUTOMATIC," selector switch in cover. Pumps
shall be automatically started and stopped by float or pressure switches,
as indicated. A multiposition sequence selector switch shall be provided
so that any two pumps may be operated simultaneously, with a third pump
being standby.
2.15.4
Flexible Connectors
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NOTE: Flexible connectors shall be provided for the
suction and discharge of each centrifugal pump only
as a solution to alignment problems to accommodate
retrofits and/or for fluid media temperatures in
excess of 82 degrees C (180 degrees F).
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Flexible connectors shall be provided at the suction and discharge of each
pump that is 0.75 kW 1 hp or larger. Connectors shall be constructed of
neoprene, rubber, or braided bronze, with class 150 standard flanges.
Flexible connectors shall be line size and suitable for the pressure and
temperature of the intended service.
2.16
WATER PRESSURE BOOSTER SYSTEM
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NOTE: Designer will indicate location, sizes,
wattage (horsepower), and capacities of equipment on
drawings. Provide duplex pumps, if discharge
capacity is greater than 94.6 L/minute (25 gpm) and
total head is at least 6 meters (20 feet).
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One of the following systems shall be used to boost the water pressure
service to the building to a value required for service within the building.
2.16.1
Constant Speed Pumping System
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NOTE: In the design of buildings which experience
periods of low water flow or no water flow, do not
install constant speed water pressure booster
systems, since this is a waste of electrical energy.
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SECTION 15405A
Page 55
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