Furnish and install,
where shown on the drawings a duplex base mounted prefabricated instrument air
system model____________ as manufactured by EMSE Corporation, Fairfield, NJ
(1-800-935-EMSE)
The unit furnished shall be
a standard catalog item of the supplier regularly engaged in the business of
providing packaged systems for hospitals and laboratories and shall meet and
exceed the requirements of NFPA 99.
The
instrument air system shall be a completely packaged NFPA 99 and NEC compliant
assembly featuring extreme duty pressure lubricated air compressors, U.L.
listed control cabinet, an ASME receiver, dual desiccant air dryers with purge
control, dual 0.5 micron pre-filters, dual charcoal absorbers, dual 0.01 micron
after-filters, line pressure regulating valves, dew point monitor and all
accessories required to meet and exceed the current code requirements. All
components are piped and wired to single-point service connections. The only
field connections are air discharge and power at the control panel. All
interconnecting piping and wiring is complete and shall be operationally tested
prior to shipment. Liquid tight conduit, fittings and junction boxes shall be
provided for all control and power wiring.
The
high pressure instrument air compressors shall be pressure lubricated,
reciprocating, air cooled design. Connecting rod and crankshaft bearings are
pressure lubricated for extended life. Lubricant to all critical parts of the
compressor is provided by an oil pump.
Compressors
are V-belt driven by 3 phase, 60 cycle, 1750
Each compressor shall be belt driven by a ____
HP, 3 phase, 60 cycle, ______ volt, 1750
Each air compressor shall
have a capacity of ________ SCFM at 180 PSIG.
The
system shall include an ASME receiver rated for 250
Also
included are intake filters, check valves, safety relief valves, discharge
flexible connectors, isolation valves, pressure switches and a shut-off valve
for gauge and switches.
The
system shall include a UL listed control panel in a NEMA 12 enclosure. The
panel includes the following standard accessories for each compressor:
externally operable circuit breaker with a door interlock, control circuit
transformer with fused primary and secondary coils, H-O-A switch, run light,
hour meter and magnetic starter with 3 leg overload protection and reset
switch. The panel is equipped with a multiple position selector switch for
selection of normal operation (automatic alternation) or manual selection of
lead and lag pumps if one of the compressors is taken out of service due to
scheduled maintenance.
Disconnect
switches for the air dryers are included.
Local
audible and visual alarms are provided per NFPA 99 for “Backup in use" and
high dewpoint. The alarms include indicating lights and a horn. The audible
alarm can be cancelled with the "Silence" button. The visual alarm
remains energized until the problem is corrected. Each alarm function includes
contacts for connection to the master alarm. All control and alarm functions
remain energized while any compressor remains on-line.
Field
adjustable pressure switches are pre-set to operate the lead compressor between
195 PSIG and 210 PSIG. The lag compressor will automatically start at 190 PSIG
if the lead compressor fails to operate.
The
instrument air slant is guaranteed by
the manufacturer for a period of 12 months from the date of start-up or 18
months from the date of shipment (whichever comes first) against defects in
design, materials, or construction.
The service of a factory trained representative shall
be made available at the jobsite to check installation, start-up and instruct
operating personnel in the proper operation and maintenance.