• the tanks or spaces are not intended for liquids
which are not compatible and that the arrangement
could not effect unacceptable condition for the ship
• the cross-sectional area of the air pipes main is generally
not less than the aggregate cross-sectional
area of the two largest pipes discharging into the
main. However, a reduced value may be considered
for acceptance in each particular case on the basis
of back pressure calculation submitted for all normal
working conditions
• as far as practical, each separate air pipe is fitted to
the common air pipe from the top side