American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 137

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-132 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
with an eight foot ladder, it must have a fall protection hook installed next to it or
provide other means of access.
9.14.4 Power
Power supply and distribution for the fire alarm system, shall be furnished in
accordance with applicable NFPA Codes.
9.15 GAS MONITORING AND SEISMIC ACTIVITY DETECTION
9.15.1 Gas Monitoring Equipment
In areas classified as "gassy" or "potentially gassy" by CAL/OSHA or when directed by the
Fire/Life Safety Committee, permanent gas monitoring equipment shall monitor hazardous
gases in the atmosphere of subterranean facilities. Each gas monitoring alarm shall be
annunciated at Central Control and at the EMP in the station where the gases detected.
Presence of an alarm shall initiate the appropriate Emergency Gas Operating Procedure
(EGOP) which activates a pre-determined ventilation scenario to purge the gas. Unless
otherwise directed by the Fire/Life Safety Committee, hazardous gases to be monitored
shall be determined by review of subsurface conditions reports and other relevant data.
A. The system shall initiate a minor alarm whenever methane is detected at 10% of
lower explosion level (LEL), or hydrogen sulfide is detected at 5ppm. Low speed
EGOP will be initiated automatically.
B. The system shall annunciate a major alarm whenever methane is detected at
20% of LEL. High speed EGOP will be initiated automatically.
C. The system shall annunciate an “evacuate” level alarm whenever methane is
detected at 25% of LEL, or hydrogen sulfide is detected at 10ppm. High speed
EGOP will be initiated automatically, and the station will be automatically
evacuated.
D. The gas system may have its own evacuation system (horns/strobes) or it can
evacuate the station using the fire alarm system (with permission from the AHJ).
In that case, coordination with the fire alarm design would be required or, it may
be possible to use a fully combined fire and gas larm system, if such a system
can be shown to meet Metro’s needs, with the concurrence of Metro and the
AHJ.
E. All alarms shall report to the EMP, both on a graphics display (showing exact
location of the gas sensor in alarm) and by tabular alarm display.
F. In addition, the current analog level of all gas sensors shall show on the SCADA
system at the ROC.
G. All portions of the gas system shall be fully monitored by SCADA, and the
system shall send trouble alarms additionally to the EMP.
H. Gas monitoring equipment shall be accessible for maintenance. There shall be
room for access with a ladder, and if a ladder over 8 feet is required, a fall
protection hook must be installed next to the device or provide other means of
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