Reading Type 22 nuclear blast-hardening figures

What do the Type 22 figures of operating at 3.5 psi and remaining mobile at 10 psi mean?

The quoted specification distinguishes operating at 3.5 psi from remaining mobile at 10 psi. Distance from the explosion depends on weapon yield, and the verbal pressure conversion is inconsistent.

The quoted Type 22 requirement sets a lower pressure threshold for operating and a higher one for remaining mobile: 3.5 psi and 10 psi respectively. The response relates blast exposure to distance from the explosion, which varies with the weapon's yield. Seals and windows are examples of fittings that need to withstand the pressure wave. The spoken explanation shifts from psi to multiples of standard pressure, so it does not provide a consistent numerical conversion or a fixed safe distance.