The permanent fittings required to serve alternative means
of access such as wire lift platform, that should be used by crew
and surveyors for inspection should provide at least an equal level
of safety as the permanent means of access stated by the same paragraph.
These means of access should be carried on board the ship and be readily
available for use without filling of water in the tank. Therefore,
rafting should not be acceptable under this provision. Alternative
means of access should be part of the Access Manual which should be
approved on behalf of the flag State. For water ballast tanks of 5
m or more in width, such as on an ore carrier, side shell plating
should be considered in the same way as "longitudinal bulkhead".