9.2.1 Corridor bulkheads, including doors, should
be "A" or "B" Class divisions extending from deck to deck. Where continuous
"B" Class ceilings and/or linings are fitted on both sides of the
bulkhead, the bulkhead may terminate at the continuous ceiling or
lining. Doors of cabins and public spaces in such bulkheads may have
a louvre in the lower half. Such openings should not be provided in
a door in an "A" or "B" Class division forming a stairway enclosure.
9.2.2 Stairs should be constructed of steel or
other equivalent material.
9.2.3 Stairways which penetrate only a single
deck should be protected at least at one level by "A" or "B" Class
divisions and self-closing doors so as to limit the rapid spread of
fire from one deck to another. Personnel lift trunks should be protected
by "A" Class divisions. Stairways and lift trunks which penetrate
more than a single deck should be surrounded by "A" Class divisions
and protected by self-closing doors at all levels. Self-closing doors
should not be fitted with hold-back hooks. However, hold-back arrangements
incorporating remote release fittings of the fail-safe type may be
utilized.
9.2.4 Air spaces enclosed behind ceilings, panellings
or linings should be divided by close fitting draught stops spaced
not more than 14 metres apart.
9.2.5 Ceilings, linings, bulkheads and insulation
except for insulation in refrigerated compartments should be of non-combustible
material. Vapour barriers and adhesives used in conjunction with insulation,
as well as insulation of pipe fittings for cold service systems need
not be noncombustible, but they should be kept to a minimum and their
exposed surfaces should have resistance to propagation of flame to
the satisfaction of the Administration.
9.2.6 The framing, including grounds and the joint
pieces of bulkheads, linings, ceilings and draught stops should be
of non-combustible material.
9.2.7 All exposed surfaces in corridors and stairway
enclosures and surfaces in concealed or inaccessible spaces should
have low flame-spread characteristics.
9.2.8 Bulkheads, linings and ceilings may have
combustible veneers provided that the thickness of such veneers should
not exceed 2 millimetres within any space other than corridors, stairway
enclosures and control stations where the thickness should not exceed
1.5 millimetres.
9.2.9 Primary deck coverings, if applied, should
be of approved materials which will not readily ignite.
9.2.10 Paints, varnishes and other finishes used
on exposed interior surfaces should not be of a nature to offer an
undue fire hazard and should not be capable of producing excessive
quantities of smoke or toxic fumes.
9.2.11 Ducts provided for ventilation of machinery
spaces of Category A and hazardous areas should not pass through accommodation
and service spaces or control stations. However, the Administration
may permit relaxation from this requirement provided that:
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.1 the ducts are constructed of steel and insulated
to "A-60" standard; or
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.2 the ducts are constructed of steel and fitted
with an automatic fire damper close to the boundary penetrated and
insulated to "A-60" standard from the machinery space of Category
A to a point at least 5 metres beyond the fire damper.
9.2.12 Ducts provided for ventilation of accommodation
and service spaces or control stations should not pass through machinery
spaces of Category A or hazardous areas. However, the Administration
may permit relaxation from this requirement provided the ducts are
constructed of steel and an automatic fire damper is fitted close
to the boundaries penetrated.
9.2.13 Windows and sidescuttles which face the
drill floor, with the exception of the wheelhouse windows, should
be fitted with inside covers of steel or equivalent material. Such
shutters may be replaced by a water-curtain protecting these windows
and sidescuttles.