Method and apparatus for external pipeline weld inspection

摘要: An apparatus is provided for external inspection of a pipeline circumferential weld. This comprises radiation source (5) and detector (3). Both units are controllably movable around drive band or track (7) which fitted the To align with moved respect to each other clockwise anticlockwise an initial position whilst sampling detected at number positions. A maximum strength signal can then be determined such that centre point may located. The substantially aligned means move circumferentially weld remaining in alignment.