The piping system for use for refractory ventilation lines, comprising: - at least one first tube having, at at least one end, a bead extending radially at least in sections in the outer region around the circumference of the first tube, - at least one second tube having, at at least one end, a bead extending radially at least in sections in the outer region around the circumference of the second tube, and - at least one clamp that can be opened to connect the pipes (2, 5), with - two beads (9, 10) arranged at least in sections, wherein the first of the beads can be brought into engagement with the bead provided on the first tube, and the second of the beads can be brought into engagement with the bead provided on the second tube, wherein the abutting edge of the end of the first tube having the bead is arranged on the abutting edge of the end of the second tube having the bead, characterized in that - a central region extending between the beads (9, 10) of the clamp and having a connector for closing the clamp at a position of the clamp provided for opening, and - a sealing compound is at least partially arranged between the abutting edge of the end of the first tube having the bead and the abutting edge of the end of the second tube having the bead - the region of the adjoining abutting edges (4, 7) of the end of the first tube having the bead and the end of the second tube having the bead is at least partially provided with a band from the outside by means of which the joint region located below the clamp is covered or can be covered, and a pressure-free foaming, flexible fire protection laminate or a material expandable under pressure is provided as band or as an additional seal. - at least one first tube having, at at least one end, a bead extending radially at least in sections in the outer region around the circumference of the first tube, - at least one second tube having, at at least one end, a bead extending radially at least in sections in the outer region around the circumference of the second tube, and - at least one clamp that can be opened to connect the pipes (2, 5), with - two beads (9, 10) arranged at least in sections, wherein the first of the beads can be brought into engagement with the bead provided on the first tube, and the second of the beads can be brought into engagement with the bead provided on the second tube, wherein the abutting edge of the end of the first tube having the bead is arranged on the abutting edge of the end of the second tube having the bead, - a central region extending between the beads (9, 10) of the clamp and having a connector for closing the clamp at a position of the clamp provided for opening, and - a sealing compound is at least partially arranged between the abutting edge of the end of the first tube having the bead and the abutting edge of the end of the second tube having the bead - the region of the adjoining abutting edges (4, 7) of the end of the first tube having the bead and the end of the second tube having the bead is at least partially provided with a band from the outside by means of which the joint region located below the clamp is covered or can be covered, and a pressure-free foaming, flexible fire protection laminate or a material expandable under pressure is provided as band or as an additional seal.