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Thermal Radiation from Marine Fire Boundaries: Evaluation and Analysis of A-60, A-30, A-15, and A-0 Bulkhead Assemblies

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Final rept. Sep 1992-Jul 1993

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This report presents the results of fire evaluation and analysis of several types of Class A insulated bulkheads, otherwise referred to as marine fire boundaries. The primary objective of this work was to determine the levels of thermal radiation and surface temperatures from the unexposed face of several assemblies, which barely meet the requirements for that classification. Of secondary importance was the determination of the amount of insulation necessary to meet the thermal requirements of the standard whether the insulation was exposed to the fire or not. This work provides a baseline database to aid in the development of fire modeling, and of regulatory criteria for assemblies of alternate materials, e.g. windows, for the determination of acceptable levels of exposure in the event of a fire in an adjacent compartment. Furnace calibration tests were performed to determine the total and radiative heat flux and temperature distribution within the furnace over the face of the bulkhead. A total of 21 full-scale fire tests were conducted on steel bulkheads insulated with mineral wool of varying thickness and densities, some in combination with calcium silicate marine panels, and uninsulated bulkheads to achieve Class A-60, A-30, A-15, and A-0 ratings. Finite-element heat transfer modeling was utilized to aid in the densitythickness selection for the tests. Radiative heat fluxes and surface temperatures were recorded for each tests, with a test length of 60 minutes.

Subject Categories:

  • Textiles
  • Metallurgy and Metallography
  • Marine Engineering
  • Safety Engineering
  • Thermodynamics

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