1 Reference should be made to IEC 60092-506 standard,
Special features - Ships carrying specific dangerous goods and materials
hazardous only in bulk.
2 For pipes having open ends (e.g., ventilation
and bilge pipes, etc.) in a hazardous area, the pipe itself should
be classified as a “hazardous area”. See IEC 60092-506
table B1, item B.
3 Enclosed spaces (e.g., pipe tunnels, bilge pump-rooms,
etc.) containing such pipes with equipment such as flanges, valves,
pumps, etc., should be regarded as an extended hazardous area, unless
provided with overpressure in accordance with IEC 60092-506 clause
7.