STANFORD RESEARCH INST MENLO PARK CA
Pagination or Media Count:
Four candidate blast closure valves for the ventilation openings of the domestic type personnel shelter are investigated theoretically. The calculated closing times of all four are one tenth or less of the required closing time, which is defined as the longest time the closure valve may stay open before the pressure build-up in the shelter exceeds the tolerable limit. For a 50-person shelter with an assumed tolerable limit of 5 psig pressure rise in the shelter, the longest required closing times for 100, 80, 60, and 40 psig ambient overpressures are 60, 75, 110, and 140 msec, respectively. Since analysis indicates that all four of the investigated candidate valves should close at rates much faster than these, the choice among valves will be determined only on the basis of reliability and cost. If sufficient confidence can be established in the physiological data given in Appendix F, the tolerable limit of pressure rise can be elevated to 23 psig see Appendix E. In that case, ventilation openings will not require blast closures provided of course that the openings are well protected from penetration of blast-borne missiles and debris that might damage ventilating and other equipments or injure personnel.
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