Abstract
The type of equipment needed for the examination by radiology of joints in welded piping may vary considerably, especially when the work is carried out both in the shops and on the installation site.
Portable X-ray equipment should be robust and improvements in present equipment could be made. The portability of gamma-ray apparatus is a great advantage, but it has disadvantages in its inferior absorption factor.
The examination of large and of small pipes calls for different procedure as do also the methods of assessing the radiographs.
The determination of the size of fine cracks is largely dependent upon the film-screen combination and there is a need for high-speed fine-grain film. Care should be taken on length of exposure and good facilities should be available for processing work. The location of large faults can be accurately obtained by a technique of double exposure. Of the various types of penetrameters, the “postage stamp” type is considered to be the most suitable for the examination of the welds of pipes.
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