Modular Ready Magazine Design for Reduced Explosives Safety Distances

摘要

Explosives safety distances for storage of less than 45,000 lb. of high explosives in earth covered magazines is controlled by the safe debris distance (1250 ft). The Marine Corps Base, Kaneohe, Hawaii requires storage of 2500 lb. of net explosive weight (NEW) at a site with less than 1250 ft of safe distance in all directions. Since the safe pressure distance for 2500 lb. is 475 ft. to the front and side (K35) and 340 ft to the rear (K25), the safe distance from the ready service magazine can be significantly reduced if the debris distance is controlled. The Naval Facilities Engineering Service Center (NFESC) was tasked to develop a ready magazine that would reduce the safe debris distance to less than 750 ft. to the side and rear. Nonpropagation walls were designed, using High Performance Magazine methodology, to reduce the maximum credible event (MCE) to 500 lb. Analytical methods were then used to determine the safe distance for hazardous debris (1 critical fragment per 600 sq. ft.). The safe distance was determined to be less than the 750 ft required for safe siting. This paper shows the modular earth-covered magazine concept and the basis for reducing the explosives safety distances.