Remote Nondestructive Testing of Unpiggable Pipelines

since 1999
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Magnetometer SKIF - MBS

Of late a contact method of pipelines technical condition diagnostics based on metal magnetic memory (MMMM) which utilizes magneto-elastic and magneto-mechanic effects was developed. Parent metal and welds areas are brought to light in excavation pits according to residual magnetization rate with recording of stress concentration lines on top of objects under examination characterized by a field maximum gradient at these lines crossings.

A non-contact magnetometric method is a new method of technical condition estimation based on exposure of flaws whereabouts owing to magnetic conductivity change registration resulted from changes in stress caused by mechanical loads or structural changes in pipeline metal (pipe deformation, internal or exterior corrosion, sags, landslip loads, etc.). A similar principle underlies exposure of flaws via registration of satiation magnetic fields by way of a magnetic flaw-detection device application. Metal flaws exposure efficiency thereof is comparable with in-line flaw detection and is not less than 75%.

Thereto a non-contact scanning Magnetometer “SKIF” of MBS product line (MBS-03, MBS-04) – which is in a sense an “out-line” flaw detector – was devised and successfully approved.


Certificate of approval of types
#30786-05 of 26.12.2005
Certificate of conformance by permissibility #6639426
of 23.11.2005

The method enables

  1. To fix position of metal flaws and insulation coating from the ground surface without pipe exposure (in linear and angular coordinates) with accuracy ± 0.25 m.
  2. To estimate the nature of pipeline metal defects, to monitor their growth and build a database on its actual technical status.
  3. To perform pipeline systems certification with entries of data on the detected flaws position in absolute geographic coordinate system (GPS), specification of a pipeline axis and laying depth.

See Also