TUP stands for Transfer Under Pressure, it is a term used when people or equipment passes from one module to another while maintaining pressure in each compartment. It is used for the people transfer from the PRM to the SDSs or from the bell to diving saturation system and vice versa.
TUP is the most delicate part of the diving mission, if a mechanical system failure a rapid decompression will result. In order to prevent accidents during TUP tasks, several devices such as Interlocks are used, installed near the clamping mechanisms to prevent accidental opening.
An interlock is used to prevent damage to equipment and injury to personnel. Interlocks promote safety and can offer protection to operators. Those installed on saturation systems can be mechanical, preventing the firing pin from being released if the chamber or a compartment is under pressure.
During the clamping or mating phase between two compartments, no operators are to remain in the transfer chamber, but they should remain in the entry lock or other compartment with the door closed. When the pressurization operations are finished and the trunk between the two compartments is pressurized, the passage of people takes place.
Massimo Torboli
DSO – Diving Safety Officer
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Cover: NATO Submarine Rescue System (NSRS), by LA(Phot) Chris Mumby, 45152365.jpg
