Detailed Analysis and Design Review of the MARK IX (Modified) Underwater Breathing Apparatus

摘要

The general design of the Mark IX (Modified) Underwater Breathing Apparatus is adequate for the purpose to which the unit is being put. However, because of the limited production and use of the apparatus and its developmental configurations, more caution must be exercised in its use than with other units having a longer history of successful operation. It is the developmental nature of the unit that contributes most to its potential dangers. There is a tendency to extemporize, to use parts not designed for such a life-support system, and to modify components piecemeal. The result is a collection of components that provide underwater breathing capability rather than a polished-design breathing system. The faults found with the apparatus were, for the most part, minor. However, a minor fault or malfunction in a life-support apparatus is potentially more serious than the same type of fault or malfunction in a different apparatus. Also, users of such apparatus, particularly diving apparatus, tend to become complacent with its continued use, making minor problems all the more hazardous.