Pressure vessel equipped with permeated gas discharging structure

A pressure vessel comprising:

• a nozzle boss into and from which a gas flows and is discharged;
• a liner coupled to a flange portion of the nozzle boss and provided with a space formed therein for receiving fluid;
• a discharge path forming part configured to form a gas discharging path from the a side of the pressure vessel comprising the nozzle boss and along an outer surface of the liner in a central axial direction;
• and
• a composite material provided at outer sides of the liner and the discharge path forming part,
• wherein the discharge path forming part comprises
• a plurality of rib members formed from the nozzle boss side along the outer surface of the liner in the central axial direction and radially disposed with respect to the central axial direction;
• and
• a ring-shaped member to which upper ends of the rib members are secured, the ring-shaped member being provided around an outer side of the nozzle boss.