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MIL-STD-40076

1997 Edition, December 17, 1997

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PRESERVATION AND PACKING OF ROCKET AND MISSILE SYSTEMS EQUIPMENT FOR SHIPMENT



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Description / Abstract:

This standard is intended to be used in support of packaging data sheets to the extent specified therein, or when specified in the absence of the packaging data sheets, it will provide basic requirements for preservation, packing, and loading of missile weapon system equipment.

The static-free breather dehumidification system was designed to provide a simple means for preserving equipment contained in large rigid containers such as shelters and vans. The expansion and contraction of the air contained in large shelters result in unusual problems in maintaining hermetic seals of air tightness. The free breather system overcomes many of these problems by reducing the degree of air pressure tightness required so that any shelter or container which is or can be sealed against free entry of air is a satisfactory item for use of the system. A free breather system consists of two basic parts, a designed venting system, and a bed of desiccant, through which all air is exchanged. The length to diameter ratio of the flexible tubing used to attach the free breather assembly to the external vent shall never be less than 10 to I, and in this instance, the tubing shall be not less than 30 inches in length. A major factor in the success or failure of the system is the air flow through the desiccant and not around it.