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284 F I R E RESEARCH {Continued) Location Frequency (c/s) Amphtude (cm) Peak acceleration (gn) Reference Vehicle hosed on 6X6 Chassis and Suspension This forms the basis of some air- field fire crash tenders 1) Front and sides of body | 6-60 1 max. 1 2 max 1 4 (3) (3) 2) Centre of floor at rear | 6-8 18 max. 2 0 max 1 0 (3) (3) Rail Transport Goods m transit | 2 100 ± 0 005 ± 1 5 ± 2 0 (1) (1) Unspecified Aircraft 1) Central fuselage | 3-150 ± 0 025 to ± 0 0076 up to 5 (1) 2) Near engme nacelles | 10-500 ± 0 038 to ± 0 0025 up to 20 (1) 3) Tailplane and extremities | 3-150 ± 0 076 to ± 0 0076 up to 5 (1) Baldwin, R. and North, M. A, (Joint Fu:e Research Organization, Boreham Wood, England) "The Number of Sprinkler Heads Openmg in Fires," Joint Fire Research Organization Fire Research Note No. 886 (August 1971) Section: E Subjects: Fire statistics. Sprinklers Authors' Summary Statistics of the number of sprinkler heads opemng in fires are used to investi- gate the influence of various factors on sprinkler behavior I t is shown that fewer sprinklers open in older premises, but there are insufficient data to investigate the reasons. More heads open in dry sprinkler systems, presumably because of delays in tripping the dry pipe valve, and these delays are estunated by means of a simple theoretical model of the early stages of the fire.
