Section 2 Hull envelope plating

2.1.1 The thickness of bottom and side shell plating is to be as required by Pt 3, Ch 5, 2 Hull envelope plating and Pt 3, Ch 6, 4 Single and double bottom structure but for tugs and pusher tugs the thickness is to be not less than:

2.1.2 The thickness of the keel plate is to be the same as required for the bottom plating. When, however, there is a rise of floor the thickness of the keel plate is to be increased by 1 mm.

2.1.3 The thickness of the bilge plating for tugs and pusher tugs is to be 1 mm more than the required thickness of the bottom shell plating. The bilge radius is to be at least ten times the thickness of the bilge plating. The bilge plating is to extend at least 100 mm on either side of the radius of the bilge plate. For the extent of bilge plating in the fore and aft direction, see Pt 3, Ch 5, 2.4 Shell plating.

2.1.4 Efficient and effectively supported fenders are to be fitted at deck level.

2.2.1 The thickness of deck plating is to be as required by Pt 3, Ch 5, 2 Hull envelope plating, but for tugs and pusher tugs the thickness of the deck is to be not less than 5,5 mm.

2.2.2 The deck thickness is to be locally increased in way of winch seatings and crane supports. The increased thickness is to be not less than 8 mm.