Pressure vessel system

A connection assembly comprising:

• a first connection part and a second connection part, said first and second connection part being configured to realize a gas tight connection;
• one or more gas sensitive parts arranged at a connection interface between the first connection part and the second connection part, wherein the one or more gas sensitive parts are configured to undergo a modification when a gas passes along the connection interface;
• and one or more detection modules configured to detect a modification of the one or more gas sensitive parts,
• wherein at least one of the one or more gas sensitive parts comprises any one of the following:
• carbon nanotubes,
• carbon black,
• a polymeric material containing carbon nanotubes or carbon black,
• a nanotube gel,
• a super-absorbent gel,
• a polymerized gel with ionic liquid as solvent,
• a catalytic bead (pellistor),
• one or more metals selected from rhodium, palladium, platinum, uranium, lanthanide, and the rare earth materials.

A pressure vessel system comprising:

• a pressure vessel for storing a gas under pressure,
• a pressure vessel body and an opening of the pressure vessel body, the opening being delimited by a substantially cylindrical wall part of the pressure vessel which protrudes outwardly,
• a boss arranged around the substantially cylindrical wall part delimiting the opening,
• one or more gas sensitive parts arranged at an interface of the boss, when there is a leakage at a leakage interface of the pressure vessel, the one or more gas sensitive parts are configured to undergo a modification when the gas passes along the interface;
• and
• one or more detection modules configured to detect a modification of the one or more gas sensitive parts.