systems not to exceed 10 Pa (3 inches Hg) from source to point
of use.
B.
The main supply line shall be provided with a shutoff valve.
The valve shall be located as to be accessible by authorized
personnel only. The main supply valve shall be located
downstream of the source valve and outside the source room or
enclosure, or where main enters the building. This valve shall
be identified. A main line valve is not required when the
source valve is accessible within the building.
C.
Each branch and riser supplied from the main line shall have
an in-line shut-off valve adjacent to the main. Each branch
supplied from a riser shall have an in-line shut-off valve
adjacent to the riser. Conceal in-line shut-off valves (e.g.
above ceiling with ceiling tag, or in a locked equipment
room.) Comply with applicable codes and standards for
concealed valves of flammable gases.
D.
Include a zone valve in a cabinet with other laboratory gas
zone valves for branches serving laboratory gas outlets.
Located separate natural gas zone valve cabinets adjacent to
other laboratory gas zone valve cabinets. Provide additional
service valves above the ceiling to subdivide areas for
maintenance.
E.
Laboratory gas outlets and vacuum inlets shall be standard
F.
Locations of piped laboratory gas outlets and vacuum inlets
are indicated in VA Program Guide 7610 (Equipment Guide List),
under "Outlets".
12.3
Alarms:
A. To insure continuous responsible observation, two master
system alarms, in separate warning locations, are required for
each laboratory gas and vacuum system.
1.
The primary warning location shall be supervised by
engineering personnel, and is required to be located at
one of the following (in order of priority): boiler plant
control office, engineering control center, or in the
office or principal working area of the individual
responsible for the maintenance of the laboratory gas
system.
2.
The secondary warning location shall be located to assure
continuous survalence during the working hours of the
facility. Suitable secondary warning locations may include
Intensive Care Nursing Unit, fire station, telephone
switchboard, security office or other continuously staffed
location.
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