United States Department of Transportation
i
Fixed Fire Fighting and Emergency Ventilation Systems for Highway Tunnels – Laboratory Testing Report
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2023-05-01
[PDF-3.14 MB]
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Alternative Title:Fixed Fire Fighting and Emergency Ventilation Systems for Highway Tunnels – Research Report
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Abstract:The Federal Highway Administration (FHWA) is currently researching the use of fixed firefighting systems (FFFS) in road tunnels. The objective of this research project is to identify and address the current industry's ability to consider the operational integration of highway tunnel emergency ventilation systems (EVS) with installed fixed firefighting systems (FFFS). The research program comprises a literature survey, an industry workshop, computer modeling, physical testing, and a summary report. This report documents the physical testing. Testing was conducted in a model tunnel (approximately 1:4 scale relative to similar full-size) in February 2022. The tests considered the ability of an FFFS to improve smoke management in a longitudinal ventilation condition. Measurements of velocity, temperature, pressure, humidity, and surface temperature were recorded, and video footage was taken. Three different nozzles were used in the tests and measurements of the nozzle spray patterns are reported. Some tests were modeled using the computational fluid dynamics (CFD) software Fire Dynamics Simulator (FDS).
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