Section 6 Information required

6.1.1 Plans are to be of sufficient detail for plan appraisal purposes. The submitted plans are to show all plating thickness, stiffener sizes and spacings, bracket arrangements and connections. Where appropriate, the plans should clearly show the allowance for corrosion margin or Owner's extra. Welding, constructional arrangements and tolerances are also to be submitted and this may be in the form of a booklet.

6.1.2 In addition to plans as normally required by the relevant parts and chapters of the Rules and Regulations for the Classification of Ships, July 2022 applicable to the ship type, the plans and information stated in Ch 1, 6.1 Plans to be submitted 6.1.3 to Ch 1, 6.1 Plans to be submitted 6.1.6 are also required to be submitted as applicable.

6.1.3 Plans covering the following items are to be submitted:

1. Drawings with the sandwich panel specifications (thickness of top, bottom plating and core thickness).

2. When sandwich construction has been utilised partly, the exact extent and location are to be indicated on all relevant plans.

3. Cavity layouts and details.

4. Details of integration with conventional steel construction, if applicable.

5. Details of integration with primary members, bulkheads, etc. For typical design details, see Ch 2, 5 Typical design details.

6. Construction procedure report.

7. The arrangement of equipments, supports, foundations, etc. in conjunction with their weight and working load information.

6.1.4 For overlay construction the following information, in addition to the information required in Ch 1, 6.1 Plans to be submitted 6.1.3 as applicable, is also to be submitted:

1. Thickness gaugings of the existing structure to be overlaid.

2. Overlay scantlings – core and new steel plate thicknesses.

3. Cavity layouts and details.

4. Details of integration with the existing structure.

5. Plans of any proposed modifications and changes to the previously approved plans (of the existing structure) are to be submitted for approval prior to the commencement of any work.

6. A detailed overlay procedure report.

6.1.5 To enable the appraisal of the proposed arrangement, the following supporting documents are also to be submitted:

1. Temperature control pressure relief plugs, where fitted – size, number and location.

6.1.6 The design documentation is to be submitted to LR to enable the approval of the steel sandwich panels of the ship and is to contain the following information:

1. detailed description of the preparation of steel;

2. for overlay construction a description of the preparation of the existing steel plate;

3. description of surface roughness to be achieved;

4. description of the arrangement of spacers and perimeter bars;

5. description of the panel restraint and arrangement;

6. description of how the material components are checked prior to injection and elastomer preparation;

7. machinery set-up and calibration procedure;

8. description of the cavity preparation and injection process;

9. a description of how the effects of weld heat input will be avoided;

10. description of the cavity humidity detection process and method;

11. max void size;

12. a description of the repair process.

6.2.1 Direct calculations may be specifically required by these Rules or may be required for ships having novel design features or may be submitted in support of alternative arrangements and scantlings.

6.2.2 In cases where direct calculations have been carried out using ShipRight procedures, the information required therein is to be submitted.

6.2.3 In general, when direct calculations have been carried out the following information is to be submitted as applicable:

1. A description of the structural modelling.

2. A summary of analysis parameters including properties and boundary conditions.

3. Details of the loading conditions and the means of applying loads.

4. A comprehensive summary of calculation results. Sample calculations should be submitted where appropriate.

6.2.4 In general, submission of large volumes of input and output data associated with such programs as finite element analysis will not be necessary.

6.2.5 The responsibility for error free specification and input of program data and the subsequent correct transposition of output rests with the Design Organisation.

6.2.6 It is recommended that the designer discuss the analysis requirements with LR as early as possible in the design cycle.

6.3.1 Additional information is required as detailed in Ch 2, 2 Core material for approval of the core material.