INDIA - Surveying inaccessible pipelines

- survey of buried transmission pipelines across difficult terrain ...

Gas transmission pipelines in the sub-continent are often laid across all kinds of difficult terrain - including paddy fields - where they may be under several feet of water and mud.

Checking the coating condition on such lines using traditional pipeline survey methods is virtually impossible, but Indian engineers, trained by Dynalog, carry out regular surveys.

Readings are first taken on the raised earth banks which separate the paddy fields. Sections which show satisfactory attenuation levels require no further attention.

Where attenuation levels are too high it is necessary to lower the water level and get down into the mud with the Detector to locate the fault(s) using some close interval readings. Repairs can then be carried out as required.