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 the 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 desiccant dryers. Include continuous
dewpoint and carbon monoxide monitoring downstream of the
filters and regulator.
L.
Locate the laboratory air compressor system intake outdoors
above roof level, at least 7.5 m (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
compressors. Combined intakes must be sized for no restriction
while flowing maximum intake possible, and provided with an
isolation valve at the header for each compressor served.
M.
Combine discharge from each laboratory vacuum pump into one
discharge pipe, sized for no restriction while flowing maximum
discharge possible, and provide an isolation valve at the
header for each pump served. Exhaust discharge at the highest
point of the building, above and at least 7.5 m (25 feet)
horizontally (may be more depending upon prevailing wind
direction and velocity) from any door, window, louvered or
ventilating opening of the building.
12.2 Piping Systems:
A.
Design natural gas piping systems in accordance with NFPA 54.
Design other pressure piping systems not to exceed 35 kPa (5
psi) loss from source to point of use. Design vacuum piping
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