DNV DNVGL-RU-SHIPS PART 6 CHAPTER 1 PDF

The scope of additional class notation Grab is to add an additional level of safety in relation to the strengthening of those parts of the hull structure that are exposed to impact loads from grabs. The rules in this section are considered to satisfy the requirements for determining the net thickness [strengthening] of structural elements, such as inner bottom and lower parts of transverse and longitudinal bulkheads; aligned with, and dependent upon, selected qualifiers as shown in Table 1.

Application

Ships built in compliance with the design requirements given in this section may be assigned the additional class notation Grab with qualifiers giving further description of the area(s) being strengthened and including the weight of grab. The additional class notation Grab does not negate the use of heavier grabs. However, the owner and operators should be made aware of the increased risk of local damage and possible early renewal if heavier grabs are used to load or unload cargo.