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flame arrestor,flame screen,flame speed,flash-back





"flame arrestor" means a device to prevent the passage of flame, complying with all relevant requirements of this Schedule. Its flame arresting mechanism is based on the principle of quenching;

"flame screen" means a device utilizing wire mesh to prevent the passage of unconfined flames, complying with all relevant requirements of this Schedule;

"flame speed" means the speed at which a flame propagates along a pipe or other system;

"flash-back" means the transmission of a flame through a device;

"high velocity vent" means a device to prevent the passage of flame consisting of a mechanical valve which adjusts the opening available for flow in accordance with the pressure at the inlet of the valve in such a way that the efflux velocity cannot be less than 30 metres per second and complying with all relevant requirements of this Schedule;

"pressure/vacuum valve" means a device designed to maintain pressure and vacuum in a closed container with preset limits.


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