Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A magnet bar may comprise at least one magnet and may be configured to collapse radially inward to the shaft. Magnetizers may include a cushion disposed about the shaft and biasing the magnet bar against a pipe wall. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module. A novel magnetizer cushion is described, as are smart pigs containing one or more circumferential or axial magnetizers.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A circumferential magnetizer module for a smart pig comprises a central shaft and at least one magnet bar for inducing a magnetic field transverse to a longitudinal axis of the shaft. The magnet bar comprises at least one magnet, and may collapse radially inward to the shaft. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. An axial magnetizer module comprises a central shaft and at least one magnet bar to induce a magnetic field coaxially to a longitudinal axis of the shaft. Magnets of opposite polarity are circumferentially disposed around ends of the central shaft. A sensor head disposed between circuit poles at each polar end monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module.

Abstract: Circumferential and axial magnetizers for a magnetic flux leakage pig. A circumferential magnetizer module for a smart pig comprises a central shaft and at least one magnet bar for inducing a magnetic field transverse to a longitudinal axis of the shaft. The magnet bar comprises at least one magnet, and may collapse radially inward to the shaft. A sensor head disposed between circuit poles at each polar end of the magnet monitors magnetic flux. An axial magnetizer module comprises a central shaft and at least one magnet bar to induce a magnetic field coaxially to a longitudinal axis of the shaft. Magnets of opposite polarity are circumferentially disposed around ends of the central shaft. A sensor head disposed between circuit poles at each polar end monitors magnetic flux. The central shaft of a circumferential magnetizer or axial magnetizer may comprise a joint linking an additional smart pig module.

Abstract: A roof system with rows of superimposed tiles (1) comprising rafters (4) and parallel horizontal shingles (2) fixed to the rafters, each shingle (2) consisting of a shaped section having an upper planar support surface (2c) partly present on a catching wing (2b) projecting upwards, in the direction of the slope of the roof, whereon is engaged, further down, at least a hook (1a), open downwards, formed on the low marginal part of the bottom surface (1b) of each tile of an upper row. The invention is characterized in that it comprises a rail (3) fixed, in the direction of the slope, on the upper surface of each rafter (4), said rail (3) being provided, on its top surface, with elements (3a, 3b) maintaining in place each shingle (2).