automatic-float-valve assembly sized and equipped to receive a 40 mm 1-1/2
inch ID commercial hose cuff. One end of the tank shall have a drain hole
at the lower edge, equipped with an expansion plug with safety chain to
prevent loss. A jumper hose shall be provided with each wet caddy, to
connect the caddy to the wall vacuum inlets. The jumper hose shall be 1.5
meter 5 foot nominal length, 40 mm 1-1/2 inch ID, and cuffed at each end
for proper connections.
2.22.3.6
Accessories
Hoses for the central vacuum system shall be 40 mm 1-1/2 inch ID
commercial-grade corrugated vacuum hose, fabricated of PVC or polyurethane,
and without wire reinforcement. Hose ends shall be equipped with vacuum
hose cuffs compatible with wall vacuum inlets, wet-caddy inlet and outlet,
and vacuum tools. Tool sets shall include a 1.5 meter 5 foot S-wand of
aluminum construction; a master shoeholder with carpet, nylon floor brush,
and squeezed shoes; and a 300 mm 12 inch long steel crevice tool, hoses and
[_____] tool set shall be supplied.
2.23
REVERSE OSMOSIS WATER TREATMENT SYSTEM
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NOTE: Consult with various equipment manufacturers
to determine suitable equipment components for the
specific application. There are several categories
of reverse osmosis treatment facilities ranging from
roughing units used for water softening to units
providing high-purity water. Units process water
ranging from domestic water to sea water. Design
depends entirely upon an adequate water analysis for
selection of proper components, since units are
designed for a specific type of water to be treated,
with not much flexibility in application. The
reverse osmosis membrane selection is critical and
the operating pressure depends on the membrane
selected. The reverse osmosis unit is only part of
the required treatment system, which may include
pretreatment facilities and additional organic
filters.
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Reverse osmosis water treatment system shall be a complete operable system
to produce water with an output that complies with ASTM D 1193, Type IV.
The reverse osmosis unit shall be capable of providing total dissolved
solids removal in excess of 90 percent, through a [replaceable] [renewable]
membrane cartridge. Cartridge shall be capable of accepting a pH range of
3 to 11 at a temperature range of 0.556 to 54.4 degrees C 33 to 130 degrees
F. Unit shall be provided complete with cartridge, feed solenoid valve,
low feed pressure cutoff and liquid filled pressure gauges. A granulated
activated carbon filter shall be installed on the feed water line to remove
chlorine prior to entering unit.
2.23.1
Water Analysis
The water analysis of the water to be treated is as follows:
SECTION 15405A
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