Methodical aspects of in-tube testing of the media surrounding a trunk pipeline are considered. The method is based on radiating media with a source of fast neutrons and the subsequent measurement of the albedo of thermal neutrons and neutron-capture gamma rays. On the basis of a laboratory model of a pipeline segment, a set of model experiments was conducted to assess the information content of radiation signals for different types of media surrounding pipes. The experiments performed have shown that it is conceptually possible to perform in-tube neutron-radiation testing of soil dikes on the surface segments of pipelines when the dike thickness reduces to a critical value lower than 30 cm. (According to SNiP (Building Standards and Regulations) rules, dikes on pipelines should be 80 cm thick.) It is also possible to detect concrete crossings and water washouts beneath a pipelines basement with a depth greater than 5 cm. A source of neutrons and a detector of the stimulated radiation can be installed together with modules for storing information within a standard in-tube pig flaw detector that is used to test the state of trunk pipelines by magnetic methods.
Possibilities of using sources of neutron radiation for radiation testing of dikes of trunk pipelines
Möglichkeiten der Anwendung von Neutronenstrahlungsquellen für die Prüfung von gedämmten Fern-Pipelines
Russian Journal of Nondestructive Testing ; 41 , 8 ; 539-543
2005
5 Seiten, 6 Bilder, 3 Tabellen, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
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