Analysis and Certification Test of High Performance Magazine Pit Covers
Abstract
The High Performance Magazine (HPM) is currently under development at the Naval Facilities Engineering Service Center (NFESC). The performance goals of the HPM are to reduce encumbered land and improve operational efficiency. By dividing the HPM into storage pits separated by nonpropagation walls, the maximum credible event can be substantially reduced. A critical component of the HPM is the pit cover. The primary purpose of the pit cover is to prevent sympathetic detonation in the storage pit caused by fragments coming from an accidental explosion during ordnance transport. The pit cover must be constructed such that sympathetic detonation is prevented when the pit cover impacts an acceptor ordnance. An arena test which examined the fragment penetration resistance of candidate cross sections was conducted. Lightweight concrete specimens constructed with and without steel face plates were subjected to the detonation loads from a MK-84 bomb (945 lb. TNT) at a standoff distance of eight feet. The results show that a twelve inch lightweight concrete section is sufficient to stop the worst case donor fragments. The finite element program DYNA3D was used to examine the response of the critical thick case acceptor (MK-82 bomb) subjected to pit cover impact. Predicted case deformation and peak pressure in the explosive fill were compared with sympathetic detonation criteria to determine the feasibility of using lightweight concrete as the pit cover material. The results indicate that the pit cover debris will not cause sympathetic detonation when the impulse loading on the pit cover is less than 16 psi-s.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1996
- Accession Number
- ADA498660
Entities
People
- James E. Tancreto
- Ronald L. Shope
Organizations
- Naval Facilities Engineering Service Center