9 Ventilation pipes to collection, storage and
treatment tanks should be in good condition, clear from internal obstruction,
and of adequate size to minimize pressure drop and to ensure satisfactory
clearance of gases. The size of the vent pipes should also be sufficient
to vent any air from blowers or from vacuum collection system discharges.
Ventilation pipes should be arranged to be self-draining at all angles
of heel and trim, to eliminate any water traps that may otherwise
form and cause blockage. Such pipes should not terminate in areas
to which personnel have frequent access and should be clear of any
sources of ignition. Any flame gauze or other fittings on the vent
terminal should be checked for cleanliness.