pressure to 345 kPa (50 psi). Run 345 kPa (50 psi) air to all
outlets in laboratory hoods and benches.
B.
If laboratory equipment being purchased by the medical center
is known, and items have requirements for higher air
pressures, provide additional tee, regulator, and piping to
that equipment at the required pressure.
C.
Natural gas, and manifolded laboratory gas system pressures
shall be determined on a project basis.
D.
Design laboratory vacuum systems to deliver 50 Pa (15 inches
Hg) at the point of use.
E.
Place a source shut-off valve for each laboratory gas and
vacuum system at the immediate outlet (or inlet, in the case
of vacuum) of the source of supply, so that the entire supply
source, including all accessory equipment, can be isolated
from the entire pipeline system.
F.
In facilities where manifolded laboratory gases occur, ensure
that adequately sized and properly constructed storage space
is provided for the gas cylinders. Primary and reserve banks
are required for cylinder gas sources.
G.
Laboratory air compressors and vacuum pumps shall serve the
laboratory air and vacuum systems only.
H.
Locate laboratory air compressors and vacuum pumps in a clean,
relatively cool environment [i.e., not with steam equipment,
exceeding 38 degrees C (100 degrees F) ambient temperature.]
Locate equipment in an area where it can be monitored
regularly.
I.
Laboratory air compressors and vacuum pumps shall be
multiplexed with single receivers. Compressors and pumps shall
be sized such that 100 percent of the design load is carried
with the largest single unit out of service. Provide three
valve bypass at receiver.
J.
Laboratory air compressors shall be a type that provides
"Medical Compressed Air", as defined by NFPA 99.
K.
Design air dryers, filters and pressure regulators for the
laboratory air system in duplex, each sized for 100 percent of
the load using duplex twin tower desiccant dryers. Include
continuous dewpoint monitoring downstream of the regulator and
carbon monoxide monitoring with sample connections on the
discharge piping after the filters and regulators. Locate
monitors adjacent to the control panel or integral with
control panel.
L.
Locate the laboratory air compressor system intake outdoors
above roof level, at least 7500 mm (25 feet) [may be more
depending upon prevailing wind direction and velocity] from
any building opening or other intake, and where no
contamination from engine exhausts, fuel storage vents, vacuum
system discharges, particulate matter or odor of any type is
anticipated. Air that is already filtered for ventilation
system use is an acceptable source for laboratory air
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