6.1.2 The requirements for strengthening for navigation in ice as given in
Pt 8, Ch 2 Ice Operations - Ice Class of the Rules for Ships are intended for
ships of conventional designs and arrangements. Units considered outside this
applicability will be specially considered by LR and may require additional
strengthening and structural analysis for the primary structure by direct
calculation, or experimental verification. See also limits to the ship length
and hull form contained in the engine power requirement in the Finnish-Swedish
Ice Class Rules and icebreaking bow form for the Polar Ship Rules.
6.1.3 The requirements for strengthening for navigation in ice as given in
Pt 8, Ch 2 Ice Operations - Ice Class of the Rules for Ships are intended for
ships operating in typical ice voyages and harbour operations. The operation of
units may require a rational analysis for determining the maximum operating ice
pressures on the structure based on acceptable environmental data such as the design
ice conditions, e.g., multi-year ice floe size and concentration, or whether
assistance from icebreakers is anticipated.
6.1.4 When a unit operates in areas where there is the possibility of collision
with icebergs, appropriate data is to be submitted and the structure suitably
strengthened for the collision loads.
6.1.5 Special requirements will be required for sea inlet chests for machinery
cooling and fire pump suctions and reference should be made to the relevant text of
Pt 8, Ch 2 Ice Operations - Ice Class of the Rules for Ships. The design and
arrangement of sea inlet chests will be specially considered as applicable to the
type of unit.