2.4 “B” and “F” Class Bulkheads

 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. When the maximum overall height in practice is to be less than given above, then the test specimen should be of the maximum height to be used in practice.

 Where the construction incorporates panels, 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 bulkhead 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 bulkhead itself, without the incorporation of these units, to establish the basic performance. A separate test(s) should be performed on a specimen(s) with the units incorporated to ascertain their influence on the performance of the bulkhead.

 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 panels and details of the components used for this purpose, details of joints, connections, air gaps and all other details.