184.108.40.206 Cylinders of gases that are greater than lecture
NFPA 45, 220.127.116.11
bottle size and have NFPA 45 Health Hazard
Ratings of 3 or 4, and cylinders of gases that have a
Health Hazard Rating of 2 without physiological
warning properties that are located in laboratory
units shall meet both the following conditions:
(1) Storage in approved continuously mechanically
ventilated gas cabinets; and
(2) Compliance with the requirements of Chapter
3, Toxic Gases, of NFPA 55.
18.104.22.168 Cylinders of pyrophoric gases that are greater than
NFPA 45, 22.214.171.124
lecture bottle size that are located in laboratory
units shall be kept in approved continuously
mechanically ventilated, sprinklered gas cabinets.
126.96.36.199 Regulator systems in laboratory operations shall be
NFPA 45, 188.8.131.52.1-2
equipped with two gauges, either on the regulator
or remote from the regulator, installed as to show
both the cylinder pressure and the outlet pressure.
When the source cylinder is outside of the
laboratory, a station regulator and gauge shall be
installed at the point of use to show the outlet
184.108.40.206 Only in use cylinders shall be allowed in the
NFPA 45 220.127.116.11-4
immediate work area. A compressed gas cylinder
shall be considered in use when it is:
(1) connected through a regulator to deliver gas;
(2) connected to a manifold being used to deliver
(3) a single cylinder secured as a reserve cylinder
alongside the cylinder described in (1).
18.104.22.168 The maximum internal volume (water volume) of
NFPA 45, 22.214.171.124
all cylinders in each of the listed classifications, in
use in the laboratory work area, shall comply with
the following [based on internal cylinder volume at
21°, 101 kPa (70°F, 1 atm)]:
(a) Maximum Quantity of Flammable Gases.
For a laboratory work areas of 500 ft² or
less, the internal cylinder volume in
standard cubic feet equals 6.0.
For a laboratory work area greater than
500 ft² or less, the internal cylinder
volume is 0.012 ft³ per ft² lab work area.