MM Engineering’s heavy-duty automated ammunition-storage door is engineered to protect NATO ammunition facilities and earth-covered explosive storehouses against extreme external blast loading.
Designed and manufactured at our UK factory, this bespoke double-leaf doorset is calculation-validated for a peak reflected pressure of 7 bar (700 kPa), a positive-phase duration of 22.4 milliseconds and an impulse of 7,842 kPa·ms.
The design was independently assessed using detailed nonlinear dynamic finite element analysis undertaken and reviewed by chartered blast engineers, including an RSES-accredited principal engineer. The assessment incorporates UFC 3-340-02 blast-engineering methodology and the external blast requirements applicable to ammunition-storage facilities under NATO AASTP-1 and UFC 4-420-01. The design also follows applicable International Ammunition Technical Guidelines, including IATG 09.10 security principles.
Under the specified loading, the maximum calculated door deflection was 211 mm, producing a joint rotation of 6°—within the permissible 12° damage criterion referenced from JSP 482.
The analysis confirms that the doorset successfully performs its primary protective function by resisting the inbound blast phase. No parts of the assembly were predicted to enter the store as secondary fragments, while the 8 mm steel door skins satisfy the relevant fragmentation requirements for earth-covered explosive storehouses.
The doorset is a sacrificial blast-resilient design. Permanent deformation and post-event inoperability are expected and acceptable for the assessed application. This controlled response enables the door to resist the critical inbound blast, limit internal fragmentation and help prevent sympathetic detonation of stored ammunition.
The doorset was approved through independent engineering calculations for installation on a NATO ammunition-storage project.
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