| 摘要 |
<p>A system for radiographic inspection of welds from at least a portion of a vertical wall such as the wall of a storage tank for gas or oil wherein the wall comprising a plurality of metal plates connected by means of the welds, the system comprising a frame comprising a first sub frame arranged to be positioned, in use, on a first side of the portion of the wall and a second sub frame arranged to be positioned, in use, on a second side of the portion of the wall which lays opposite to the first side of the portion of the wall and wherein each of the sub frames extend downwardly from a top portion of the frame wherein the system comprises a radiation source which is attached to the first sub frame for transmitting electromagnetic radiation towards the weld and a radiation detector which is attached to the second sub frame for detecting radiation which has travelled through the weld for carrying out the inspection, characterised in that the system is arranged such that in use, the first sub frame and the second sub frame are mechanically and rigidly connected to each other such that the frame as a whole is rigid wherein the system is further provided with suspension transportation means such as suspension wheels connected to the frame, preferably to an upper portion of the frame wherein the suspension transportation means are arranged, in use, to be positioned on an upper free edge of the portion of the wall so that the frame can drive over the upper free edge of the portion of the wall for scanning a weld to be inspected by means of the radiation source and the radiation detector wherein the weld extends in a direction of the upper edge of the portion of the wall.</p> |
