FESTING TIME FOR TUNNEL SPRINKLERS

摘要

Early activation of automatic sprinklers in tunnels is of the utmost importance. Based on the model-scale tests performed, the activation time of the first sprinkler is found to be around 2.8-3.8 minutes (full scale 4.9-6.6 minutes), when the fire size is in a range of 0.1-0.2MW (full scale 1.6-3.1MW). In one typical case investigated where the fire was on the right side of a full-scale tunnel, the estimated tunnel velocity remains at 1m/s for the first five minutes and gradually increases to 2m/s after 10 minutes (Li and lngason, 2017). Under such conditions, ventilation flow has limited effect on system activation. The passenger car activated only one sprinkler in the cases that were tested.