Description

Elecromagnetic techniques measure the wall thickness of a pipe by sensing the attenuation and phase delay of an electromagnetic signal passed through the pipe wall. The signal is induced into the pipe by an internally or externally placed coil which is energised by a low frequency voltage.The BEM technique makes use of both the amplitude and phase characteristics of the electromagnetic signals at various frequencies. These correspond to iron quantities within the sensor area. By processing this information and comparing the results to an existing database an accurate determination can be made of the thickness of the remaining ferrous metal.

The BEM system can be applied to condition assess any ferrous pipelines (cast iron, mild steel, wrought iron, ductile iron). It is a non-contact technique so coatings or surface corrosion do not hinder measurements as experienced when using ultrasonics.

A versatile methodology for measuring thickness of ferrous pipelines that is:

• Non-destructive
• Environmentally safe
• Not diameter constrained
• Capable of scanning through thick linings
• Water resistant

A cost effective method for measuring pipeline corrosion both internally and externally