tolerance is plus or minus 3.175 mm 1/8 inch.
2.11.12
Open-Weave Tape
Tape shall be open-weave type and shall have an average weight of [_____]
kg per square meter ounce per square yard and shall be used for embedding
between coats of adhesive or coating materials.
2.12
SUMP PUMPS AND DRAINERS
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NOTE: Delete this paragraph when positive drainage
of the valve manhole is provided and sump pumps are
not needed. Use of duplex sump pumps is encouraged.
Delete text in brackets if a single sump pump is
specified.
Provide one or two sump pumps in valve manholes.
Units should discharge by buried piping to the
nearest storm sewer if possible. Where not
economical to discharge to a storm sewer, pumps are
to discharge above grade. Plan discharge locations
carefully so water will not be discharged over valve
manhole tops, sidewalks, etc. Check available NPSH
versus required NPSH for pump selected. Coordinate
power requirements with electrical designer and
provide tell-tale light above ground to indicate
sump pump failure.
Drawings will show the following: (a) a dedicated
circuit; (b) lockable switches and circuit breakers
that can both be locked ON; (c) permanent labels at
key positions indicated on the drawings so that
personnel can understand that the circuit should be
left ON. The label shall be on a corrosion
resistant metal plate and shall read as follows:
THIS CIRCUIT SUPPLIES POWER TO THE ELECTRIC SUMP
PUMPS IN THE UNDERGROUND HEAT DISTRIBUTION SYSTEM.
THIS CIRCUIT MUST BE ON AT ALL TIMES; OTHERWISE
EXTENSIVE DAMAGE WILL OCCUR TO THE UNDERGROUND HEAT
DISTRIBUTION SYSTEM AND PREMATURE FAILURE WILL OCCUR.
**************************************************************************
2.12.1
Sump Pumps
Sump pumps with the capacities indicated shall be installed in the valve
manholes as shown. The sump pumps furnished shall be a manufacturer's
standard commercial product. Sump pumps shall be electrically driven and
submersible, capable of operating while completely submerged. The pumps
and motors shall be capable of continuously pumping liquids at a
temperature of 93 degrees C 200 degrees F. The pumps and motors shall be
capable of running without damage when not submerged. Sump pumps shall
have permanently lubricated bearings, monel shafts, bronze impellers,
screened inlets and housings of bronze. Each sump pump shall be capable of
passing a 10 mm 3/8 inch sphere. The motors shall have the wattage
(horsepower) horsepower indicated and shall have overload protection. The
discharge piping shall be schedule 80 or shall be protected from corrosion.
The pumps shall be automatically controlled by a submersible switch
assembly with pump wiring and switch suitable for submersion in 93 degrees
SECTION 02560
Page 18
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