Section 1 General

101. Application

1. Requirements stipulated in this Guidance apply to the Offshore Support Vessels (hereinafter referred to as vessels in this Guidance) defined in 202.

2. Unless otherwise specified in this Guidance, relevant requirements of Rules for the Classification of Steel Ships are to be applied.

3. The hull structures, equipment and scantlings of ships, to be classified for restricted service, may be appropriately modified according to the conditions of service.

4. The Society may request additional requirements, depending upon utility and designated operations.

102. Ships of unusual form or proportion, or intended for carriage of special cargoes In ships of unusual form or proportion, or intended for carriage of special cargoes, when deemed

necessary, the requirements concerning hull structures, equipment, arrangement and scantlings will be decided for such ships based on the general principle of this Guidance.

103. Equivalency

Even though the hull structures, equipment, arrangement, scantlings and machinery(including elec- trical installations) are in compliance with this Guidance, it will be accepted as meeting this guid- ance provided that the Society is satisfied that such structures, equipment, arrangement, scantlings and machinery are equivalent to those required in this Guidance.

104. Direct strength calculation

1. Where approved by the Society, scantlings of structural members may be determined based on di- rect strength calculation. Where the calculated scantlings based on direct strength calculation exceed the scantlings required in this Guidance, the former is to be adopted.

2. Where the direct strength calculation specified in the preceding Par 1 is carried out, the results and the necessary data for the calculation are to be submitted to the Society

105. Novel Features

Offshore Support Vessels, machinery and systems which contain novel features of design to which the provisions of these Guidance are not directly applicable may be classed on the basis that these

Guidance, insofar as applicable, has

been complied with and that special consideration has been

given to the novel features, based on the best information available at that time. Risk evaluations

for the justification of alternative arrangements or novel features may be applicable either to the offshore support vessel as a whole, or to individual systems, subsystems, equipment or components.