This Appendix contains requirements for maintenance, selection, and installation
of gas-detection systems. Explanations for when gas detection is required are
presented in the General Compressed Gas Systems, Flammable Gases, and
Health Hazard Gases sections of this chapter.
The principal investigator or gas-use supervisor is primarily responsible
for the management of gas-detection system maintenance related to his or her
project or operation.Maintenance must at a minimum follow manufacturer’s recommendations for
maintenance, including frequency of maintenance, and LBNL/PUB-3122, Maintenance
Program Guidelines for Programmatic Equipment. Testing of the detection
system’s ability to detect and transmit a signal to the Fire Department must
follow NFPA guidelines, or must occur on at least a quarterly basis. The Facilities
Department will provide technical guidance, if requested.
The principal investigator may assign maintenance tasks to qualified subordinates,
the Facilities Department, or contractors.Personnel conducting detector maintenance must be adequately trained,
having detector manufacturer recommended training, or an equivalent, and be
certified as “qualified” maintenance personnel.
A formal system of documentation will be maintained for each gas detection
system, and will include:
Manufacturer’s operation and service manualsPreventive maintenance procedures, post-maintenance testing, schedules,
and records of resultsProcedures and records for verifying proper connection of detector alarms
and interlocksRecords of all repairs, calibrations, nonroutine maintenance, and system
failuresNames and qualifications of maintenance personnelCalibration source documentation
A one-year summary (e.g., log) of function checks and maintenance actions performed
must be visibly maintained on the detector system. Minimum summary information
must include date, person’s name, and action taken.
Systems must be listed by Underwriters Laboratory, Factory Mutual, or Canadian
Safety Association, and the California State Fire Marshall’s office, or equivalent.
The Fire Department may approve unlisted equipment if listed equipment is not
available or is inferior.
Gas-detector sensitivity must be below the lowest PEL or TLV for health hazard
gases and/or at or below 1015% of the lower explosive limit (LEL) level
for flammable gases.
System hardware must include:
Separate relays for “warning” (low-concentration gas detection), “alarm”
(high-concentration gas detection), and “trouble” (malfunction) conditions,
and normally open and normally closed dry-contact-relay output capability for
specified but adjustable levels of gas detection.Capability system that is installed as fixed-in-place, with hard-wired
and plumbed connections.Control protection from direct unauthorized personnel access.
Detection system installations will be designed and documented (i.e., plans
and as-built drawings) by the Facilities Department. A Facilities Department
licensed professional engineer and EH&S Fire Protection Engineer will approve
all designs prior to contract award or installation. In addition, an EH&S
Industrial Hygienist will approve all toxic and oxygen-deficiency-detection
Gas-detector sample points must be placed immediately adjacent to potential
leak points or in the flow path of exhausted enclosures.
All gas-detection systems must have:
Audible and visual alarms in the following locations: gas supply location,
gas use or operator room, and outside the gas use room (e.g., corridor).An alarm status and gas-concentration readout panel must be located outside
the gas use room.Local audible and visual alarms must be specific and distinct from fire
alarm bells and have signs to indicate the alarm’s meaning and required personnel
Gas-detection systems required by this policy must have alarm connections to
the Berkeley Lab Fire Department Alarm Room, which continuously monitors alarm
status. Alarm connections must be made through the building and Berkeley Lab
fire alarm system, must transmit “alarm” and “trouble” signals as separate zones,
and must be made in accordance with NFPA 72.
Alarm conditions must consist of “trouble,” “warning,” and “alarm.”Toxic-gas “warning” and “alarm” level setpoints must normally be set at
less-than-PEL/TLV and equal-to-PEL/TLV concentrations, respectively.Flammable-gas warning and alarm level setpoints must normally be set at
1015% LEL and 20% LEL, respectively.Low-level “warnings” must activate local alarms and personnel response
only.High-level “alarms” must activate local-area evacuation, automatic gas
shutdown at the gas source, and Fire Department notification.
The detection and alarm systems will be connected to emergency power.
In the event of a power failure, the detection system must continue to operate
without interruption (e.g., must have an uninterruptable power supply), or gas
systems must be automatically shut down at the gas source.Power connections, control switches, and adjustments that affect the system’s
safety control must be protected from direct access (e.g., must be hard-wired
or covered and locked).
Ensures that gas users are adequately protected by verifying that appropriate
detector systems are selected and installed.Ensures implementation of detector maintenance and calibration in an approved
manner.Ensures that records of gas-detection system maintenance are maintained
and archived.Provides records of new or removed gas-detection systems to Maintenance.Ensures that documented self-assessments of gas detection system functions
and maintenance are conducted.
Manages gas-detector maintenance services for detector users who request
service. Provides service on a chargeback basis through Maintenance, outside
contractors, or other means.Maintains and archives records of gas-detection system maintenance for
activities that are managed by Maintenance. In addition, provides maintenance
status reports to the principal investigator.Administers detector maintenance contracts, if requested.Maintains an updated inventory of all gas detectors, and provides copies
of same to EH&S.Installs and maintains fire alarm systems used to monitor gas-detection
systems.Assists in the selection, installation, and startup of maintainable and
reliable detector systems.
Assists in gas-detector system and hardware selection.Develops and approves detector, alarm, and interlock system design packages.Reviews and approves detection system construction, installation, and
Provides an EH&S coordination role in the following areas:
Assists in detector, alarm, and interlock-system conceptual design and
selection. Approves design and installation. Witnesses acceptance tests of detection
systems.Specifies alarm setpoint concentrations.Determines toxic-gas physiological warning property ratings.Periodically audits installation and maintenance of gas detectors as one
component of the EH&S Integrated Functional Appraisal Program.
Monitors and responds to alarms transmitted via the fire alarm system
or emergency telephone number system.
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