Section 4 Main and auxiliary machinery

4.1.1 For surface type units, the general requirements for main and auxiliary machinery are to be in accordance with Pt 5, Ch 1 General Requirements for the Design and Construction of Machinery of the Rules for Ships. Aspects which relate to the specialised offshore function of the unit will be considered on the basis of Pt 5, Ch 1 General Requirements for Offshore Units and are to be complied with as applicable. All other main and auxiliary machinery requirements are to be in accordance with Pt 5, Ch 2 Reciprocating Internal Combustion Engines of the Rules for Ships and are to be complied with as applicable.

4.1.2 For surface type self-elevating units, the general requirements for main and auxiliary machinery are to be in accordance with Pt 5, Ch 1 of the Rules for Ships. Aspects which relate to the specialised offshore function of the unit will be considered on the basis of Pt 5, Ch 1 General Requirements for Offshore Units and Pt 3, Ch 4, 2 Structure, and are to be complied with as applicable. All other main and auxiliary machinery requirements are to be in accordance with Pt 5, Ch 2 Reciprocating Internal Combustion Engines of the Rules for Ships and are to be complied with as applicable.

4.1.3 For both column-stabilised and self-elevating units, the main and auxiliary machinery requirements are to be in accordance with Pt 5 Main and Auxiliary Machinery and are to be complied with as applicable.

4.1.4 For all unit types, due account should be taken of the unit type and operational role when applying these requirements.

4.2.1 For surface type units, the angles of inclination are to be in accordance with Pt 5, Ch 1, 3.7 Inclination of ship of the Rules for Ships.

4.2.2 For surface type self-elevating units in the afloat conditions, the angles of inclination are to be in accordance with Pt 5, Ch 1, 3.7 Inclination of ship of the Rules for Ships.

4.2.3 For both column-stabilised and self-elevating units, the angles of inclination are to be in accordance with Pt 5, Ch 1, 3.7 Inclination of ship.

4.3.1 For all unit types with accommodation for more than 12 persons who are not crew members, the requirements of Pt 3, Ch 4, 3 Bilge systems and cross-flooding arrangements for accommodation units are to be complied with as applicable.

4.4.1 For all types of self-elevating units, the number of jacking cycles expected to be seen during the unit’s intended design life will need to be specially considered in the design of the jacking gear machinery. Relevant calculations will be required to be submitted, taking into account the expected number of jacking cycles during the unit’s intended design life.