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DNV-OS-A101 Safety Principles and Arrangements
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Sec.6
B. Escape Routes
Sec.6
B 100 Principles
Sec.6 B
101 Safe, direct and unobstructed exits, access, and escape routes
shall be provided from all normally manned areas of the unit or
installation to temporary refuge, muster areas and embarkation or
evacuation points.
Sec.6 B
102 All regularly manned areas shall be provided with at least
two exits and escape routes, separated as widely as practicable
such that at least one exit and the connected escape route will
be passable during an accidental event. Escape routes shall normally
be provided on both sides of the unit or installation.Guidance note:
Dedicated escape routes need not necessarily apply to very
infrequently manned areas, e.g. which are subject to structural
inspection only, where suitable arrangements can be made with temporary
access facilities (e.g. scaffolding etc.).
Single exits may be acceptable from small access platforms,
rooms and cabins with low vulnerability to the location or room
or the exit area.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.6
B 200 Sizing
Sec.6 B
201 Escape routes shall be of suitable size to enable quick and
efficient movement of the maximum number of personnel who may require
to use them, and for easy manoeuvring of fire-fighting equipment
and use of stretchers.Guidance note:
Typical values for width of escape routes would be 1m for
main escape routes and 0.7m for secondary escape routes, with consideration
given to areas for manoeuvring a stretcher.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.6
B 300 Walkways, stairs, ladders and lifts
Sec.6 B
301 Any necessary changes in elevation along escape routes shall
be by stairs. Ladders may only be accepted where it is clearly not
practicable to install stairs, and only for use by a very limited
number of personnel in an emergency.
Sec.6 B
302 Lifts shall not be considered as an emergency means of escape.
Sec.6 B
303 All escape route doors shall be readily operable in the main
direction of escape and shall not be a hazard to personnel using
the escape route outside. Doors from cabins and small offices are
excluded from this requirement. Dead end corridors greater than
7 m in length shall be avoided.
Sec.6 B
304 The surfaces of decks, walkways, platforms, stairs and ladder
rungs etc. shall be non-slip, and designed for drainage and easy
cleaning of contaminants like mud and oil, where relevant.Sec.6
B 400 Escape from machinery spaces category
A
Sec.6 B
401 Two means of escape shall be provided from every machinery
space of category A.
Sec.6 B
402 Where the machinery space is below open deck level the means
of escape shall be according to the following:- Two sets of steel ladders separated
as widely as possible, leading to similarly separated doors in the
upper part of the space, which give access to the open deck. One
of these ladders shall normally provide continuous fire shelter
from the lower part of the space to a safe position outside the
space. Fire shelter shall be of suitably insulated steel, with a
self-closing door at the lower end.
- One steel ladder leading to a door in the upper part
of the machinery space which gives access to the open deck, and
additionally, a steel door located in a lower part of the machinery
space and separated from the ladder. The lower door shall be operable
from both sides and shall lead to a safe escape route from the lower part
of the space to the open deck.
Guidance note:
The number of means of escape may be reduced based on a consideration
of the nature and use of the space and the normal level of manning
within the space. (ref MODU Code 9.3.2).---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.6
B 500 Railings and barriers
Sec.6 B
501 Railings and other barriers shall be designed with sufficient
strength, height and arrangement such that personnel are protected
from falling either overboard or more than 0.8 m to a lower deck
level.
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