2.23.2
System Requirements
A storage tank, a pressure distribution pump, a control panel, and
necessary pressure vessels shall be provided. Minimum service output shall
be the indicated continuous water flow capacity at the indicated design and
operating temperature. A continuous Cl2 residual of 0.2-1.0 ppm shall be
maintained in the influent stream to the system. Operating pressure shall
be as required for the type of membranes necessary to suit the indicated
water quality. Pumps, chlorinator, any required organic filters,
pretreatment equipment, and control valves, shall be provided as part of
the operable system to produce the quality of water specified. The control
panel shall bear UL listing label for industrial control panels and shall
be in a NEMA 250, Type 1, enclosure. The control panel shall include the
following: audio-visual alarm, external resets, motor controllers,
time-delay transformers, relays, timers, and selector switches. Pressure
vessels shall be factory air tested to 1-1/2 times the working pressure.
Pressure vessels shall be equipped with valves and accessories, including
pressure gauges and automatic and manual drains. Pressure vessels shall be
supplied with the manufacturer's standard protective coating. Pressure
vessels shall be designed and constructed in accordance with ASME BPVC SEC
VIII D1, and shall have the design working pressures required. A display
of the ASME seal on the receiver or a certified test report from an
approved independent testing laboratory indicating conformance to the ASME
Code shall be provided. Process pumps shall be the manufacturer's standard.
2.23.3
Booster Pumps
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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 liters per minute (25
gpm) and total head is at least 6 meters (20 feet).
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Booster pumps shall be provided where it is necessary to boost the output
pressure of the reverse osmosis water treatment system to meet the
indicated de-ionized water system pressure requirement. Pumps shall be of
all-bronze construction or all-stainless steel construction in accordance
with ISS PB-224, Type 316. Head and capacity shall be as shown. Pumps
shall be 1800 rpm, end suction, frame mounted, centrifugal type, with
mechanical seals. Pumps shall be direct connected to the electric-motor
drive through a flexible coupling, and each mounted on a separate cast iron
or fabricated steel base. Bases shall have a drip lip and drain tapping.
Test curves shall be furnished showing capacity in L/minute gpm, head in
meters feet, efficiency, and brake wattage horsepower. Multiple pump
installations shall have pump characteristics compatible for operation in
parallel with similar pumps. Guards shall shield exposed moving parts.
Pump controls shall be provided to maintain pressure on the distribution
system as indicated.
2.24
WATER SOFTENING WATER TREATMENT SYSTEM
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NOTE: For hospital use, water with a hardness
expressed as CaCO(3) exceeding 171 mg per liter (10
grains per gallon) or 171 ppm will require
softening. Degree of softening required will depend
SECTION 15405A
Page 76
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