Section 2 Definitions and structural terms

2.1.1 For the purpose of clarifying the nomenclature of items of structure referred to throughout these Rules, unless expressly stated otherwise, the terms used herein have the meanings defined in the following definitions, see also Pt 3, Ch 3, 1.1 Application 1.1.1 of the Rules and Regulations for the Classification of Ships, July 2022.

2.1.2  Primary members are those members supporting the steel sandwich panel and will be typically:

1. Deck structure – deck transverses and girders.

2. Side structure – side transverses and side stringers.

3. Bulkheads – vertical webs and bulkhead stringers.

4. Single and double bottom structure – floors and girders.

2.1.3 The fore end region is considered to include all structure forward of 0,7L.

2.1.4 The aft end region is considered to include all structure aft of 0,3L.

2.1.5  Overlay or Overlay construction is defined as when the existing steel structure is overlaid with elastomer and a new steel top plate according to the requirements of Ch 2 Material Manufacture and Construction Procedures and Ch 3 Design Basis for Panels.

2.1.6  Design organisation is the organisation that provides the design and construction plans.

2.1.7 The Design documentation refers to the ‘Construction Procedure Report’ or ‘Overlay Procedure Report’ as applicable.

2.2.1 A Steel Sandwich Panel consists of three layers. Two external layers of steel and an internal core layer, see Figure 1.2.1 Steel sandwich panel scantling definition.

Figure 1.2.1 Steel sandwich panel scantling definition

2.2.2 The term core applies to the layer between the steel plates. The core is injected in between the top and bottom steel plates and bonds mechanically directly to the steel surfaces.

2.2.3 The term bottom plate applies to the steel plating to which primary members are attached.

2.2.4 The term top plate applies to the steel plating exposed to sea, weather or cargo.

2.2.5  Cavity is defined as the space enclosed by the top and bottom steel plates and perimeter bars.

2.2.6  Panel is defined as the sandwich panel enclosed by the primary members.

2.2.7 The term spacer applies to the square or round block made of elastomer or steel secured to the bottom plate. A spacer is intended to maintain the required distance between the top and bottom plates, see Ch 2, 3.3 Preparation of steel 3.3.5.