What is the minimum overbottom pressure required from 0-60 FSW when diving the KM37?

The minimum overbottom pressure required from 0-60 FSW (Feet of Sea Water) when diving with the KM-37 system is established to ensure safe and effective operation under water. The correct answer is 90 psi because this pressure level accounts for the hydrostatic pressure exerted by the water at the given depth, along with additional considerations for safety and operational requirements of the diving system.

At 60 FSW, the hydrostatic pressure alone is approximately 26 psi (since each 33 feet of seawater exerts about 14.7 psi). To achieve the necessary overbottom pressure that includes the safety factor (for breathing air and equipment function), 90 psi ensures that divers can operate safely and efficiently without any risk from insufficient gas supply or equipment malfunction.

This value is typically referenced in the operational guidelines for surface-supplied diving systems, which incorporate considerations for providing adequate pressure to compensate for dynamic factors such as depth changes, exertion of divers, and any potential pressure losses within the supply system.