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20.24.240 <br />route. The signal shall be relayed to an <br />approved Underwriters Laboratory (UL) <br />Central Station Service as directed by the <br />Fire Chief and shall also initiate a local <br />audible alarm. <br />(d) Class III Controls. <br />Persons responsible for a facility shall <br />cause materials which are classified as <br />Class III materials to be provided with the <br />controls specified in this subsection (d) .and <br />in subsections (e) and (f) of this section. <br />(1) Piping, valves and fittings. <br />[i] Piping, valves, fittings and related com- <br />ponents shall be designed and fabricated <br />from materials compatible with the material <br />to be contained. They shall have strength <br />and durability sufficient to withstand the <br />pressure, structural and seismic, and any <br />other stress and exposure to which they <br />may be subjected. <br />[ii] Expansion chambers may be provided <br />between valves whenever the regulated gas <br />may be subjected to thermal expansion. <br />Chambers shall be sized to provide protec- <br />tion for piping, valves and instrumentation <br />and to accommodate the expansion of regu- <br />lated materials. <br />(2) Signage. <br />[i] Stationary above ground tanks shall be <br />placarded with hazard identification signs <br />as specified in Fire Code Standard No.79-3, <br />for the specific material contained. <br />[ii] Signs prohibiting smoking shall be <br />posted in indoor storage, use and handling <br />areas and within 25 feet of outdoor storage, <br />use and handling areas. <br />[iii] Signs shall not be obscured or re- <br />moved. <br />[iv] Signs shall be in English and such <br />other languages as may be appropriate, as <br />determined by the Fire Chief. <br />[v] Signs shall be durable. <br />[vi] The size, color and lettering shall be in <br />conformance with nationally recognized <br />standards determined by the Fire Chief to <br />be applicable to the regulated material, (i.e. <br />NFPA 704 System). <br />(3) Inert Gas Purge System. Gas systems <br />for regulated materials shall be provided <br />with individually dedicated inert gas purge <br />systems (e.g., nitrogen, helium, argon and <br />neon). <br />(e) Minimum Threshold Quantity Controls. <br />Responsible persons shall cause materials <br />which do not exceed the Minimum Thresh- <br />old Quantity to be provided with the con- <br />trols specified in this subsection (e) and in <br />subsection (f) of this section. <br />(1) Exhaust Ventilation. <br />[i] Storage of cylinders shall be within <br />ventilated gas cabinets, exhausted enclo- <br />sures or within a ventilated separate gas <br />storage room as defined in the Fire Code. <br />[ii] Storage of portable and stationary tanks <br />shall be within a separate ventilated room <br />without other occupancy or use. <br />[iii] If gas cabinets are provided, the room <br />or area in which they are located shall have <br />independent exhaust ventilation. <br />[iv] Exhaust systems for gas cabinets, ex- <br />hausted enclosures and separate gas storage <br />rooms shall be designed to handle the acci- <br />dental release of gas. Such exhaust systems <br />shall be capable of diluting, adsorbing, <br />absorbing, neutralizing, burning or other- <br />wise processing the entire contents of the <br />(Pleasanton April 2003) 710-60 <br />