1 Scope
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.757(18) – Standards for the Calculation of the Width of Stairways Forming Means of Escape on Passenger Ships – (Adopted on 4 November 1993) - Annex - Standards for the Calculation of the Width of Stairways Forming Means of Escape on Passenger Ships - 1 Scope

1 Scope

  1.1 These standards should be used when applying Regulation II-2/28.1.5.1 of the 1974 SOLAS Convention as amended by Resolution MSC.27(61).

  1.2 It should be recognized that the evacuation routes to the embarkation deck may include a muster station. In this case consideration should be given to the fire-protection requirements and sizing of corridors and doors from the stairway enclosure to the muster station and from the muster station to the embarkation deck using these guidelines noting that evacuation of persons from muster stations to embarkation positions will be carried out in small controlled groups.

  1.3 It is the intention that the calculation method should consider evacuation from enclosed spaces within each main vertical zone individually and take into account all of the persons using the stairway enclosures in each zone, even if they enter that stairway from another main vertical zone.

  1.4 For each main vertical zone the calculation should be completed for the night time (case 1) and day time (case 2) and the largest dimension from either case used for determining the stairway width for each deck under consideration.

  1.5 The calculation method determines the stairway width at each deck level taking into account the three consecutive stairways leading into the stairway under consideration.

Parent topic: Annex - Standards for the Calculation of the Width of Stairways Forming Means of Escape on Passenger Ships
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.