"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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