How is air supply for the SSD calculated?

The calculation of air supply for the Submersible Search and Rescue Device (SSD) is critical for ensuring the safety and efficiency of operations during undersea rescues. It is determined based on the requirements during the descent phase and the bottom phase of the operation. The standard measure used is 1.4 actual cubic feet per minute (acfm), which accounts for the diver’s breathing rate under different conditions.

During the descent phase, the diver requires a certain amount of air to breathe as they descend into deeper water where pressure increases. Similarly, during the bottom phase, the diver is working at a specific depth, which also demands a consistent air supply due to the continued physical exertion and the effects of pressure on breathing.

This calculated approach ensures that divers have a sufficient air supply throughout the critical phases of their operation, thereby maximizing safety and minimizing risks associated with inadequate air supplies. Each diver's requirements alone would not provide a comprehensive safety margin because conditions such as water depth, exertion levels, and pressure changes also significantly influence air consumption.

By focusing on both the descent and bottom phases, this method ensures that the air supply is adequately addressed for the entire operation, promoting effective rescue efforts in undersea scenarios.