(1) Machinery space openings in position 1 or
2 shall be properly framed and efficiently enclosed by steel casings
of ample strength, and where the casings are not protected by other
structures their strength shall be specially considered. Access openings
in such casings shall be fitted with doors complying with the requirements
of regulation 12(1), the sills of which
shall be at least 600 mm above the deck if in position 1, and at least
380 mm above the deck if in position 2. Other openings in such casings
shall be fitted with equivalent covers, permanently attached in their
(2) Where machinery casings are not protected
by other structures, double doors (i.e. inner and outer doors complying
with the requirements of regulation 12(1))
shall be required for ships assigned freeboards less than those based
on table 28.2 of regulation
28. An inner sill of 230 mm in conjunction with the outer sill
of 600 mm shall be provided.
(3) Coamings of any fiddley, funnel or machinery
space ventilator in an exposed position on the freeboard deck or superstructure
deck shall be as high above the deck as is reasonable and practicable.
In general, ventilators necessary to continuously supply the machinery
space shall have coamings of sufficient height to comply with regulation 19(3), without having to fit weathertight
closing appliances. Ventilators necessary to continuously supply the
emergency generator room, if this is considered buoyant in the stability
calculation or protecting opening leading below, shall have coamings
of sufficient height to comply with regulation
19(3), without having to fit weathertight closing appliances.
(4) Where due to ship size and arrangement this
is not practicable, lesser heights for machinery space and emergency
generator room ventilator coamings, fitted with weathertight closing
appliances in accordance with regulation 19(4),
may be permitted by the Administration in combination with other suitable
arrangements to ensure an uninterrupted, adequate supply of ventilation
to these spaces.
(5) Fiddley openings shall be fitted with strong
covers of steel or other equivalent material permanently attached
in their proper positions and capable of being secured weathertight.