WITH DESICCANT DRYERS
Furnish and
install, where shown on the drawings a duplex
stack 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 oil-less reciprocating air-cooled design. Connecting
rod and bearings shall be packed with lifetime lubrication and sealed.
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 100 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 unloaders, isolation valves, air cooled aftercoolers for
each compressor, high discharge temperature shut down switches on each
cylinder, 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 05
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
0oF
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.