WITH DESICCANT DRYERS
Furnish and
install, where shown on the drawings a duplex
tank mounted prefabricated medical compressed air plant with desiccant air
dryers model____________ as manufactured by EMSE
Corporation,
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 package shall include
two oil-less air compressors and associated equipment, one horizontal ASME tank
and one duplex control panel. The entire system including the dryers, filters
and monitors shall be mounted on the tank. The only field connections required
will be system intake, exhaust and power connection at the control panel. All
components shall be completely pre-piped and pre-wired to single-point service
connections. All interconnecting piping and wiring shall be completed and
operationally tested prior to shipment. Provide liquid tight conduit, fittings
and junction boxes for all control and power wiring.
The medical air compressors
shall be of the totally rotary oil-less scroll design. They
are dynamically balanced for very low noise levels and virtually no vibration.
Each compressor shall be belt
driven by a ____ HP, 3 phase, 60 cycle, ______ volt, 1750
Each air compressor shall
have a capacity of ________ ICFM at 120 PSIG.
The system shall include
individual compressor inline intake filters, discharge check valves of bronze
construction, safety relief valves, bronze intake and discharge flexible
connectors, solenoid valves, isolation valves, air cooled aftercoolers for each
compressor, high discharge temperature shut down switches, pressure control
switches, as well as copper tubing with shut-off cock for gauge and switches.
The system shall include a 120 gallon pressure storage tank of ASME construction
rated for 200
The system shall include a
UL listed control panel in a NEMA 12 enclosure with the following accessories
for each pump:
Externally operable circuit
breaker with door interlock, control circuit transformer with fused primary and
secondary coils, H-O-A switch, magnetic starter with 3 leg overload protection,
hour meter and motor running light. Provide the panel 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 pumps is taken out of
service due to scheduled maintenance. Provide audible and visual local alarm
(complete with indicating lights and individual sets of auxiliary contacts wired
to the terminal strip for remote alarm indication) for the following:
compressor temperature malfunction and reserve compressor in use. Provide
manual reset for thermal malfunction shut-down. All control and alarm functions
shall remain energized while any compressor in the system remains electrically
on-line. The lag compressor shall be able to start automatically if the lead
compressor fails to operate.
A completely packaged NFPA
99 and NEC compliant assembly featuring dual desiccant air dryers, dual 0.5
micron pre-filters, dual 0.5 micron after-filters, line pressure regulating
valves, dew point monitor, CO monitor and other accessories required to meet
and exceed the current code requirements shall be mounted on the compressor
system base. All components shall be completely pre-piped and pre-wired to
single-point service connections.
There shall be two identical banks of air treatment equipment, piped in parallel and provided with valves to by-pass either filter set for element replacement, maintenance and repair work on one of the sets while still treating medical compressed air through the other set without any sacrifice in air quality. Each bank consists of three stages of treatment.
The first stage is a
prime efficiency coalescer with particle removal down to 0.5 micron. Maximum
downstream remaining oil content 0.5 PPM/WT.
Retention on DOP test >99.97%. This filter removes aerosols and solid
particles.
The second stage is a
desiccant heatless air dryer, equipped with purge control. Pressure dewpoint of
00F is attained by directing the
flow of saturated compressed air over a bed of desiccant which is contained in
two separate but identical "twin" towers. The dry compressed air is
discharged from the "on line" tower into the third stage.
The third stage
is a prime efficiency particulate afterfilter with particle removal down to 0.5
micron. The after filter element is provides high particle retention, low
pressure drop and long element life.
Downstream pressure
regulators will maintain constant discharge pressure of 55 PSIG (field
adjustable).
Digital dew point and
CO monitors with alarm set points at +390F and 10 PPM are provided with dry contacts for
connection to remote alarm panels. A "demand check" for maintenance
is included per current NFPA 99 for each instrument.
The compressed air system
shall be guaranteed in writing 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. In
addition, the compressors are guaranteed for 36 months from the date of
shipment.
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.