Hong Kong Regulations

DANGEROUS GOODS (SHIPPING) REGULATIONS - REGULATION 11

Precautions regarding openings to cargo tanks

When any type II vessel is loading or discharging any dangerous goods in
category 5, class 1 or 2, all openings from cargo tanks to the open air,
except such as to form part of the ventilating system thereof, shall be kept
closed: Provided that nothing in this regulation shall be construed to prevent
the opening of any ullage plug or sighting port for so long as may be
necessary for the purpose of taking dips or samples, or the opening of any
such ullage plug or sighting port if it is adequately protected by strong,
clean and incorrodible wire gauze of nominal aperture size not greater than
0.5 mm and of nominal wire diameter not greater than 0.35 mm. (L.N. 119 of
1983)