Abstract: An in-line pipe inspection tool has a sensor carrier carrying a plurality of sensor for monitoring the pipe. In order to permit the sensor carrier and hence the sensors, to conform to changes in the diameter of the pipe being inspected, the sensor carrier is a part cylindrical body which is resiliently flexible. However, to stop one part of the sensor carrier twisting torsionally relative to another part, a bracing unit is fixed to one part the sensor carrier and engages another part of the sensor carrier to resist said torsional twisting.

Abstract: An in-line pipe inspection tool has a sensor carrier carrying a plurality of sensor for monitoring the pipe. In order to permit the sensor carrier and hence the sensors, to conform to changes in the diameter of the pipe being inspected, the sensor carrier is a part cylindrical body which is resiliently flexible. However, to stop one part of the sensor carrier twisting torsionally relative to another part, a bracing unit is fixed to one part the sensor carrier and engages another part of the sensor carrier to resist said torsional twisting.

Abstract: Vehicle parts of a pipeline pig are connected by a pivotable joint. The joint comprises first and second part-spherical hollow shells joined together, each shell having an aperture therein, said apertures being aligned, said first shell being mounted in a curved recess in said first vehicle part to the pivotable therein part, said second shell being mounted in a curved recess in said second vehicle part to the pivotable therein, the first and second vehicle parts each having ducts leading to the joint and communicating with said apertures and wherein pipeline pig harnessing passes between the vehicle parts through said ducts and said apertures.

Abstract: A pipeline pig comprises a central body member and a first drive member (26) mounted on the body member, the first drive member including a central annular support element (60) mounted on, to surround, the body member, and a plurality of circumferentially spaced primary drive elements (62) one end of each of which is secured to the support element (60) whereby the primary drive elements (62) extend substantially radially from the support element (60) and such that, in use, the other, free ends of the primary drive elements (62) engage the inner wall of the associated pipeline, each primary drive element (62) being capable of bending rearwardly of the direction of movement of the pig about the one end extent thereof to maintain engagement with the inner wall of pipelines within a range of diameters without increasing the drag thereon, the first drive member (26) further including a flexible backing disc (68) rearward of the primary drive elements (62) and adapted to seal against the inner wall of the pipeline