Section 2 Information required

2.1 General

2.1.1 General requirements regarding information required are given in Pt 3, Ch 1, 5 Information required of the Rules for Ships, which are to be complied with as applicable.

2.1.2 Additional plans, documents and data are to be submitted for approval and information as required by the relevant Parts of these Rules, together with the additional information related to the unit type and its specialised function as defined in this Part.

2.1.3 Where an OIWS class notation, for In-water Survey, is to be assigned, see Pt 1, Ch 2 Classification Regulations, plans and information covering the following items are to be submitted as applicable:

Details showing how rudder pintle and bush clearances are to be measured and how the security of the pintles in their sockets is to be verified with the unit afloat.
Details and arrangements for inspecting thrusters and sea chests.
Details showing how stern bush clearances are to be inspected and measured with the unit afloat.
Details of arrangements for servicing and unshipping thrusters.
Details and arrangements for servicing sea inlet valves and checking sea chests.
Details of underwater marking, see Pt 3, Ch 1, 6 Underwater marking.
Details of coating systems and cathodic protection, see Pt 8 CORROSION CONTROL.

2.1.4 Approved plans and information covering the items detailed in Pt 3, Ch 1, 2.1 General 2.1.3 are to be placed on board the unit.

2.2 Construction booklet

2.2.1 A construction booklet including a set of plans showing the exact location and extent of application of different grades and mechanical properties of structural materials, together with welding procedures employed for primary structure, is to be submitted for approval and a copy to be placed aboard the unit. Any other relevant construction information is to be included in the booklet, including restrictions or prohibitions regarding repairs or modifications.

2.2.2 Similar information is to be provided when aluminium alloy or other materials are used in the construction of the unit.

2.2.3 Copies of the main scantlings plans and details of the corrosion control system fitted are to be placed on board the unit.

2.3 Demarcation between Process and Marine Systems

2.3.1 A classification demarcation plan is to be submitted for approval that identifies any boundaries of classification.

2.3.2 The unit will encompass a split between the traditional Classification scope and that nominally described as process plant. It is noted that particularly with respect to new build projects the differentiation can lack clarity and it is not purely a function of location of the systems on the unit. Accordingly, a list of items to be considered under Classification requirements is to be developed, this may be extracted from the project equipment list, associated P&ID’s and shall be agreed with LR. The equipment list shall also be used to identify those systems which fall inside and outside of Class and will form the basis of a classification demarcation plan for the unit.

2.3.3 It should be noted that the location of an item rather than its function can influence the decision for inclusion within the Classification list of items. By example a tank serving a topsides process, that would normally be considered part of the topsides process plant, should be considered a Class item if it is located within the hull and adversely impacts the overall risk.

2.3.4 It should be noted that the forgoing has been written with facilities encompassing a significant process plant in mind. However, it is recognised that other facilities e.g. crane barges will also benefit from this approach. Accordingly, in these instances, an equipment list, associated P&ID’s, if appropriate, and plot plan are to be submitted for review.