20.1 Valves for oil fuel tanks located in accordance
with the provisions of paragraphs 6, 7 and 8 of MARPOL Annex I, regulation 12A, may be treated
in a manner similar to the treatment of suction wells as per MARPOL regulation 12A.10 and, therefore,
arranged at a distance from the ship’s bottom of not less than h/2.
20.2 Valves for tanks which are permitted to be
located at a distance from the ship’s bottom or side at a distance
less than h or w, respectively, in accordance
with the accidental oil fuel outflow performance standard of MARPOL
Annex I, regulation 12A.11,
may be arranged at the distance less than h or w,
respectively.
20.3 Fuel tank air escape pipes and overflow pipes
are not considered as part of “lines of fuel oil piping”
and, therefore, may be located at a distance from the ship’s
side of less than w.
20.4 In addition to being as small as practicable,
the size of the suction wells mentioned in MARPOL Annex I, regulation 12A.10, should be appropriate
to the size of the suction pipe and area covered.