3 Additional instrumentation
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.727 – Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions – (Adopted on 4 July 1996) - Annex - Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions - 3 Additional instrumentation

3 Additional instrumentation

  3.1 Additional instrumentation consists of a restricted-view total-heat fluxmeter of the SchmidtBoelter thermopile typefootnote, calibrated with the restricted view to indicate incident heat fluxfootnote. The fluxmeter should be water-cooled, and have a range of 0 to 50 kW/m2 when testing windows to A-0 and B-0 standards.

  3.2 The fluxmeter should be placed perpendicular to the centre of the window being tested, and in a position such that the centre of the fluxmeter's view coincides with the centre of the windowfootnote (see the figure). The fluxmeter should be located at a distance greater than 0.5 m from the window, such that the view of the fluxmeter just includes part of the window frame while remaining outside of the convective boundary layer of the test specimen. However, the fluxmeter should not be located more than 2.5 m from the window.

  3.3 For windows whose greater dimension is less than 1.57 times the smaller dimension, only one fluxmeter is needed.

  3.4 For oblong windows whose greater dimension is more than 1.57 times the smaller dimension, additional fluxmeters should be provided. The distance of the fluxmeters from the window should be adjusted such that the fluxmeters' view covers at least 50% of the window. However, the fluxmeters should not be located less than 0.5 m nor more than 2.5 m from the window.

Figure 1 Positioning of Fluxmeter

Parent topic: Annex - Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions
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