return piping system, and a manual extinguisher fill pump
capable of receiving CO2 at 2067 kPa, and an oxygen monitor and
d) The system should be in accordance with NFPA 12,
contain CO2 at -17.7 degrees C and 2067 kPa and should be sized
to provide a minimum of 30 days of CO2.
For details, refer to
Appendix I, Figures I-1 through I-7.
Caution: Extra care should be taken when
liquid CO2. Too much liquid CO2 in an
extinguisher will cause an explosion when the
CO2 changes state from a liquid to a gas due to
expansion as the liquid heats up from -17.7 degrees C
e) CO2 is also used in cartridges for propelling PKP
from portable extinguishers. These cartridges are not
Due to the potential for CO2 gas leakage, provide
an oxygen (O2) monitoring and alarm system in enclosed spaces
containing the CO2 recharging system. The O2 monitoring and
alarm system should tie into the main propane alarm control
panel so as to provide alarm and annunciation to the 24-hour
duty desk, instructor's station, and to the DTC. Local alarm
and flashing warning sign should also be provided. The warning
sign should state "DANGER, CO2 CONDITION."
g) At the closest outside entrance to the CO2
recharging system, provide the following in weatherproof lockers
with the appropriate labels:
A portable CO2 and O2 detection kits.