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Non-destructive testing — Long-range inspection of above-ground pipelines and plant piping using guided wave testing with axial propagation
The guided wave testing (GWT) method allows for fast inspection of above-ground pipelines, plant piping and cased road crossings, giving a qualitative screening and localization of probable corroded and eroded areas. GWT is typically performed on operating piping systems.
ISO 18211:2016 is applicable to the following types of pipes:
a) above-ground painted pipelines;
b) above-ground insulated pipelines;
c) painted plant piping;
d) insulated plant piping.
NOTE Pipe sections within road crossings with external casings (without bitumen or plastic coating) are a special case of buried pipe where there is no soil pressure on the OD of the pipe. ISO 18211 :2016 applies to these cased road crossings.
Other types of pipes not included in the above list need dedicated approaches due to increased complexity.
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