PRENTICE, GARTH R.,KNIGHT, STEPHEN,DRAKE, STEPHEN G.
申请号：
DK10763220
公开号：
DK2470077T3
申请日:
2010.08.27
申请国别(地区):
DK
年份:
2015
代理人:
摘要：
An apparatus is provided for external inspection of a pipeline circumferential weld. This comprises a radiation source (5) and radiation detector (3). Both units are controllably movable around a drive band or track (7) which is fitted around the circumferential weld. To align the source with the detector the source and detector are moved with respect to each other clockwise and anticlockwise around an initial position while sampling the radiation detected at a number of positions. A position of maximum strength of the radiation signal detected can then be determined such that the center point of the radiation source may be located. The source and detector are then substantially aligned with each other and means are provided to move the source and detector circumferentially around the weld while remaining substantially in alignment.
