2.7 “B” and “F” Class Linings
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Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.754(18) – Recommendation on Fire Resistance Tests for “A”, “B” and “F” Class Divisions – (Adopted on 4 November 1993) - Annex - Recommendation on Fire Resistance Tests for “A”, “B” and “F” Class Divisions1 - 2 Nature of Test Specimens - 2.7 “B” and “F” Class Linings

2.7 “B” and “F” Class Linings

Parent topic: 2 Nature of Test Specimens

2.7.1 Dimensions

 The minimum overall dimensions for the test specimen are given in SOLAS Regulation II-2/3.2, but the recommended dimensions of the test specimen, including the perimeter details at the top, bottom and vertical edges, are 2,440 mm width and 2,500 mm height. Irrespective of the overall dimensions, the width and the height of the lining should each be 20 mm greater than the equivalent dimensions of the structural core.

2.7.2 Design

 The lining should be positioned alongside a structural core constructed in accordance with 2.1.1. The design of the lining should be such that it facilitates its assembly with the limited access provided by the proximity of the structural core, i.e. it should be mounted with the structural core in place.

 During a test on an "A" class bulkhead which utilizes membrane protection along its exposed side, e.g. a "B" class lining, it is possible also to evaluate the performance of the lining with a view to classification providing that the necessary thermocouples are attached to the lining and providing that the necessary integrity measurements are made.

 The specimen should be constructed such that at least one of the panels is of full width and this, or these, should be positioned such that both its/their longitudinal edges are jointed to an adjacent panel and are not secured to the restraint frame.

 If the lining may incorporate electrical fittings, e.g. light fittings and/or ventilation units, it is necessary that initially a test is performed on a specimen of the lining itself, without the incorporation of these units, to establish the basic performance. A separate test(s) may be performed on a specimen(s) with the units incorporated to ascertain their influence on the performance of the lining.

2.7.3 Description

 The applicant should provide full constructional details of the test specimen in the form of drawings (including a detailed schedule of components) and method of assembly, such that the laboratory is able to confirm agreement between the actual specimen and the drawings and specifications prior to the test. The drawings should include dimensions and details of the thicknesses of materials used in the insulation system (e.g. of any panels), the method of securing the insulation system and details of the components used for this purpose, details of joints, connections, air gaps and all other details.

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