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ABSTRACTS AND REVIEWS 283 Thorne, P. F . (Fire Research Station, Boreham Wood, England) "The Vibrations to Which Dry Powder Extinguishers May be Subjected During Storage," Fire, February, 1971 Section: E Subject: Powder extinguishers, storage vibration Reviewed by G Fristrom A study of the level of vibrations hkely to be encountered in various locations where fire extinguishers are stored was made. The following table summarized the results. Levels of vibrations found in various locations Location Frequency (c/s) AmpUtude (cm) Peak acceleration (gn) Reference Buildings 1) Near road and rail transport 2) Near heavy machinery 10-60 8-35 Up to 0 001 Up to 0 023 Up to 0 2 Up to 1 0 (2) (2) Large Ships (eg, aircraft earner) 1) Stem 2) Waist and forecastle | 2 60 ± 0 38 ± 0 0076 ± 0 064 ~ 0 1 0 8 ~ 0 01 (1) (1) (1) SmaU Water Craft 1) Stem 2) Waist and forecastle < 5-15 5-15 80 ± 0 0305 ± 0 013 ± 0 0051 ~ 0 2 ~ 0 1 ~1 5 (1) (1) (1) Unspecified Road Vehicles 1) Goods in transit ' 2) Suspension 3) Body 4) Engine 1- 3 15-40 2- 4 8-15 20-60 <3 0 1 0 3 0-5 0 1 0 (1) (1) (1) (1) (1) 30 cwt to 10 ton Lomes Floor over rear axle ' Continuous spectra peaking at 3 c/s, 20 c/s and 70 c/s 1 0 to 1 5 r m s (4) Unspecified Road Vehicles 1) Suspension 2) Wheel hop 3) Body 2-3 10-20 30-50 Mean value of ~ 0 4 Maximum value ~1 0 (5) (5) (5)
