BS ISO 19897:2019 pdf free download – Ships and marine technology一Marine evacuation systems一Testing under conditions of icing.
The International Life-saving Appliance (LSA) Code states in paragraph 6,2.2.1.8 that a marine evacuation system shall be designed to, as far as practicable. remain effective under conditions of Icing. This document is intended to provide uniform test specifications in support of this critical functional requirement.
This document provides specifications for a test of marine evacuation systems (MES) under conditions of icing in support of the requirement in paragraph 6.2.2.1.8 of the International Life-saving Appliance (LSA) Code.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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3.1
marine evacuation system
MES
appliance for the rapid transfer of persons from the embarkation deck of a ship to a floating survival craft by means of a passage (32)
3.2
passage
designated connection between the embarkation station and the survival craft(s) which can be an inflatable or rigid slide, a vertical passage (14) or any other arrangement that can provide for safe transfer to survival crafts
3.3
inclined passage
angled (to the horizontal) inflatable or rigid passage (32), which provides access for persons to a floating platform (3S) or directly into survival crafts
3.4
vertical passage
passage (32) providing vertical controlled descent for persons to a floating platform (3k) or directly into survival crafts
3.5
floating platform
platform that may be fitted at the bottom of the passage (32) to hold evacuees awaiting entry to survival craft
Note 1 to entry: In some system configurations, a survival craft may also serve as a platform.
— moving parts,
— winches,
— retaining lines, and
— connection lines.
5.2 Reference device
If the system configuration includes means of anti-icing/de-icing, which makes it impractical to build up the required layer of icing in relevant areas, then a reference device may be accepted to determine when activation of the system can be initiated.
The reference device shall be in the shape of an angle iron with the following dimensions:
Height: 100 mm ± 10 mm
Width: 100 mm ± 10 mm
Thickness: 10 mm ± 2 mm
Length: 300 mm ± 20 mm
The reference device shall be positioned approximately 40 cm in front of the test set-up with the open side facing the water spraying direction. If the system to be tested exceeds more than 3 m in length, a reference device shall be used for every 3 m of the length.
All critical parts of the stowage arrangement shall be exposed to the layer of icing in the simulated installed configuration, which shall include any designed anti-icing precautions as well as the reference device(s).
When at least a 3,5 cm thick layer of icing has formed on the horizontal and vertical part of the reference device facing the spraying direction, the required icing conditions are considered to be accomplished. The system shall then be actuated and the deployment of the system initiated without failure.