9.1.7 Special arrangements for air pipes of
flammable oil tanks
a) Air pipes from fuel oil and thermal oil tanks are to discharge
to a safe position on the open deck where no
danger will be incurred from issuing oil or gases.
Where fitted, wire gauze diaphragms are to be of corrosion
resistant material and readily removable for cleaning
and replacement. The clear area of such diaphragms
is not to be less than the cross-sectional area of the pipe.
b) Air pipes of lubricating or hydraulic oil storage tanks,
which are neither heated nor subject to flooding in the
event of hull damage, may be led to machinery spaces,
provided that in the case of overflowing the oil cannot
come into contact with electrical equipment, hot surfaces
or other sources of ignition