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[ii] Expansion chambers may be provided between valves whenever the regulated gas <br />may be subjected to thermal expansion. Chambers shall be sized to provide protection <br />for piping, valves and instrumentation and to accommodate the expansion of regulated <br />materials. <br /> <br />(2) Signage. <br /> <br />[i] Stationary above ground tanks shall be placarded with hazard identification signs as <br />specified in Fire Code Standard No.79-3, for the specific material contained. <br /> <br />[ii] Signs prohibiting smoking shall be posted in indoor storage, use and handling areas <br />and within 25 feet of outdoor storage, use and handling areas. <br /> <br />[iii] Signs shall not be obscured or removed. <br /> <br />[iv] Signs shall be in English and such other languages as may be appropriate, as <br />determined by the Fire Chief. <br /> <br />[v] Signs shall be durable. <br /> <br />[vi] The size, color and lettering shall be in conformance with nationally recognized <br />standards determined by the Fire Chief to be applicable to the regulated material, (i.e. <br />NFPA 704 System). <br /> <br />(3) Inert Gas Purge System. Gas systems for regulated materials shall be provided with <br />individually dedicated inert gas purge systems (e.g., nitrogen, helium, argon and neon). <br /> <br />(e) Minimum Threshold Quantity Controls. Responsible persons shall cause <br />materials which do not exceed the Minimum Threshold Quantity to be provided with the <br />controls specified in this subsection (e) and in subsection (f) of this section. <br /> <br />(1) Exhaust Ventilation. <br /> <br />[i] Storage of cylinders shall be within ventilated gas cabinets, exhausted enclosures or <br />within a ventilated separate gas storage room as defined in the Fire Code. <br /> <br />[ii] Storage of portable and stationary tanks shall be within a separate ventilated room <br />without other occupancy or use. <br /> <br />[iii] If gas cabinets are provided, the room or area in which they are located shall have <br />independent exhaust ventilation. <br />[iv] Exhaust systems for gas cabinets, exhausted enclosures and separate gas storage <br />rooms shall be designed to handle the accidental release of gas. Such exhaust systems <br /> 122 <br /> <br /> <br />