Abstract: A piping comprising a pressure vault formed of at least one interlocked shaped wire, each turn of the wire having at least one stud and a groove adjacent the stud, the stud interlocking into a groove of an adjacent turn of a shaped wire. At least one additional gas circulation passage through the stud and/or in the bottom of the groove is defined, the passage allowing gas circulation between the inside and the outside of the vault in addition to clearance between the stud of one turn and the bottom of the groove of the adjacent turn, or in the absence of clearance between the stud of one turn and the bottom of the groove of the adjacent turn.