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shall be capable of diluting, adsorbing, absorbing, neutralizing, buming or otherwise <br />processing the entire contents of the single tank or cylinder of gas which presents the <br />highest potential hazard. <br /> <br />[V] Systems utilized for such processing shall be designed as a treatment system, as <br />described in subsection (e) 3 of this section. Ifa total containment system is utilized, the <br />system shall be designed to handle the maximum anticipated pressure of release to the <br />system when the system reaches equilibrium. <br /> <br />(2) Gas Cabinets. When gas cabinets are provided they shall be: <br /> <br />[i] Operated at negative pressure in relation to the surrounding area. <br /> <br />[ii] Provided with self-closing limited access ports or fire-rated windows to give access to <br />equipment controls. The average velocity of ventilation at the face of access ports or <br />windows shall be not less than 200 feet per minute (fpm) with a minimum of 150 fpm at <br />any other point of the access port or window. <br /> <br />[iii] Connected to a treatment system. <br /> <br />[iv] Provided with self-closing doors. <br /> <br />[v] Constructed of steel with a thickness not less than 12-gauge. <br /> <br />(3) Treatment systems. <br /> <br />[i] Treatment systems shall be utilized to process all exhaust ventilation to be discharged <br />from gas cabinets, exhausted enclosures or separate storage rooms. Treatment systems <br />shall be designed to reduce the maximum allowable discharge concentration of the gas to <br />one-half IDLH at the point of discharge to the atmosphere as specified in subsections (e) <br />5 and 6 below. <br /> <br />[ii] When more than one gas may be emitted to the treatment system, the treatment <br />system shall designed to handle the worst case release based on the release rate, the <br />quantity and the IDLH for all the gases stored or used. <br /> <br />(4) Treatment system sizing. Treatment system shall be sized to process the worst case <br />release of each gas based on the maximum flow rate of release from the cylinder or tank <br />utilized which presents the highest potential hazard. The entire contents of tanks and <br />cylinders shall be considered. <br /> <br />(5) Stationary tanks. <br /> <br />123 <br /> <br /> <br />