What is the minimum manned pressure for depths of 0 to 60 FSW?

The minimum manned pressure for depths of 0 to 60 feet of seawater (FSW) is 90 psi. This standard is set to ensure that the pressures experienced in underwater environments can be safely managed by divers or rescue operations.

At a depth of 60 FSW, the pressure due to water alone is approximately 29.5 psi from the water column, and when you add atmospheric pressure at the surface (14.7 psi), the total pressure is around 44.2 psi. For operations involving humans, safety margins are implemented, and pressure needs to account for vessel integrity and operational requirements, leading to a manned pressure threshold of 90 psi.

This figure provides a cushion that allows for variations in environmental conditions, equipment tolerances, and emergency scenarios. Thus, the chosen pressure provides an operation margin that ensures safety and effectiveness for undersea operations.