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gases are in contact with any valve or fitting, the <br />liquid flow rate shall be utilized for purposes of <br />computation. All flow rates indicated on the label <br />shall be converted to cubic feet per minute ~cfm~ <br />of gas at normal temperature and pressure ~NTP~. <br />iv. Portable Tanks and C linders. For portable <br />tanks and cylinders, the maximum flaw rate of release <br />shall be calculated based on assuming the total re- <br />lease from the cylinder or tank within the time spe- <br />cified in Table 80.303-B. When portable tanks or <br />cylinders are equipped with approved excess flow or <br />reduced flaw valves, the worst case release will be <br />determined by the maximum achievable flow from the <br />valve as determined by the valve manufacturer or the <br />gas supplier. Reduced flow and excess flow valves <br />shall be permanently marked by the manufacturer to <br />indicate the maximum design flow rate. Such markings <br />shall indicate the flow rate far air under standard <br />conditions. <br />Table 80.303-B <br />RATE OF RELEASE FOR CYLINDERS AND PORTABLE TANKS <br />Non-Liquefied Liquefied <br />Container ~Minute,s~,__ Minutes <br />Cylinders 5 30 <br />Portable tanks 40 240 <br />7. Emergency Power. Emergency power shall be provided <br />in lieu of standby power for: <br />A. Exhaust ventilation, including the power supply <br />for treatment systems. <br />B. Gas detection systems. <br />C. Emergency a1 arm systems. <br />D. Temperature control systems. <br />8. Limit Controls. In addition to the limit controls <br />required in Section 80.3o1~t~, excess flow control shall be <br />provided for stationary tanks which are piped far filling or <br />dispensing. <br />9. Gas Detection. A continuaus gas detection system <br />shall be provided to detect the presence of gas at or below <br />the permissible exposure limit ~PEL~ or ceiling limit. Where <br />no PEL or ceiling limit exists, the appropriate Threshold limit <br />Value ~TLV} should be utilized instead. The detection system <br />shall initiate a local a1 arm and transmit a signal to a con- <br />stantly attended control station. The alarm shall be both <br />visua] and audible and shall be designed to provide warning <br />both inside and outside of the storage area. The audible <br />alarm shal 1 be distinct from al 1 other a1 arms . <br />EXCEPTION: <br />I. Signal transmission to a constantly attended <br />control station is not required when not more than <br />one cylinder is stored. <br />2. A continuaus gas-detection system need not <br />Ordinance - 35 <br />