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accordance with appropriate nationally recognized industry standards and practices, if any. Appropriate remedial action shall be immediately undertaken when leaks are detected. 20.24.430 CFC Section 6004.1.15 added —Inert pas purse system. Section 6004.1.15 is added to read: 6004.1.15 Inert pas purge system. Gas systems shall be provided with dedicated inert pas purge systems. A dedicated inert pas purge system maV be used to purge more than one pas provided the gases are compatible. Purge pas systems inside buildings shall be located in an approved pas cabinet unless the system operates by vacuum demand. Exception: Refrigeration systems. 20.24.440 CFC Section 6004.1.16 added —Seismic shutoff valve. Section 6004.1.16 is added to read: 6004.1.16 Seismic shutoff valve. An automatic seismic shut-off valve, which is of a fail-safe to close design, shall be provided to shutoff the supply of highly toxic, toxic and moderately toxic gases with an LC50 less than 3,000 parts per million upon a seismic event within 5 seconds of a horizontal sinusoidal oscillation having a peak acceleration of 0.3G (1.47m/sect) and a period of 0.4 seconds. 20.24.450 CFC Section 6004.1.17 added —Fittings and connections. Section 6004.1.17 is added to read: 6004.1.17 Fittings and connections. Fittings and connections shall be located in a pas cabinet, exhausted enclosure, gas room or exhausted valve manifold box. Exception: Welded connections. 20.24.460 CFC Section 6004.2 amended —Indoor storage and use. Section 6004.2 is hereby amended to read: 6004.2 Indoor storage and use amended. The indoor storage or use of highly toxic, toxic and moderately toxic compressed gases shall be in accordance with Sections 6004.2.1 through 6004.2.2.10.4. 20.24.470 CFC Section 6004.2.1 amended —Applicability. Section 6004.2.1 is hereby amended to read: 6004.2.1 Applicability. The applicability of regulations governing the indoor storage and use of highly toxic, toxic and moderately toxic compressed gases shall be in accordance with Sections 6004.2.1.1 through 6004.2.1.5. 20.24.480 CFC Section 6004.2.1.1 amended —Quantities not exceeding the maximum allowable quantity per control area. Section 6004.2.1.1 is hereby amended to read: Page 36 of 52