FIELD: machine building.
SUBSTANCE: elastic casing consists of cylinder and two end parts, of connecting part and of air tube for compressed air pumping. The air tube is coupled with the connecting pipe by an angular connecting pipe. At its free end it is equipped with the second angular connecting pipe for fixation in an orifice of the pipeline wall. The connecting pipe is arranged on an internal side of an arc-shaped or circular groove, preferably of "П"-form section. The groove is formed with the wall of a cylinder part of the casing and is designed for air tube placement. Additionally, labyrinth packing in form of circular lugs of triangular section is made on external surface of the cylinder part of the casing.
EFFECT: increased safety factor of casing, reliability of pipeline internal cavity sealing, raised fire safety at repair and fire operations.
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