The Interlocking mechanism is a safety device intended to protect any pressure vessel subject to be opened during routine operation procedures; this includes soda lime pots, Food and Material Locks, Diving Bell Mating Clamps, etc…
The requirement for such a device is present in all Rules and guidelines, including DNV-GL, IMCA, Norsok, etc. According to the standards, the safety device has to be completely pneumatic – electric or electronic components are not allowed.
The scope of the interlocking mechanism is double: the first is to prevent the opening of the pressure vessel in case an unsafe pressure is present inside the vessel; the latter is to prevent the pressurization of the vessel until it is fully closed and the interlocking mechanism is engaged.

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