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Permanently installed tool-head called Perm-A-Mount

​This device consists of a transducer array attached directly to the pipe surface providing all the benefits Guided Wave Inspection without the problems with access.

Perm-A-Mount is a low-cost, long-life tool installation intended for regular monitoring of piping systems in environmentally hostile, safety critical or difficult to access areas.



Applications:

Typical Applications for this technique include:
• Road or River Crossings
• Jetty lines
• Elevated lines
• Insulated lines
• Off shore risers
• Buried lines
• Sub sea lines (with further development)





These regions were ideal for Guided Wave Inspection due to the areas having limited access for conventional non-destructive localized inspection. In addition, the pipe was a long straight length and Guided Waves provides 100% volumetric coverage of the pipe wall

Guided wave system was used to inspect the aerial river crossings.Gwt is an externally applied inspection tool which can screen pipelines   (and   process   piping)   for   internal   and external corrosion. Pipelines can be tested in service, avoiding the need to shut down and stop production for  inspection.  A  wide range  of  pipe  sizes  can  be inspected, from 2” to 48” nominal diameter.

The widest of the aerial river crossings inspected was 65m in length after which the line entered a buried section. The system utilizing the 5 ring torsional tool was used in this particular case and the results show that whole crossing was inspected from one side of the crossing plus 20m -25m inspection of the buried and wrapped section was also covered.

Guided wave  ultrasonic  testing  was used  to  inspect  the  24”  line  which  was  buried  a depths between 3m and 5m and identify areas for possible follow-up inspection.

The client had specified that they would be happy with 30% coverage of the un-piggable buried section.
The inspection team managed coverage of over 90% utilizing the 5 ring Torsional tool which was developed for pipelines exhibiting a high rate of attenuation. At some locations scans of up to 75m were diagnosed.

It is a pulse-echo system  aimed  at  testing  large volumes of material from a single test point. Its initial application was for detecting
corrosion under insulation in petrochemical plant pipe-work, but it has found widespread use in other inspection situations where pipes or tubes are not accessible, for example where  they  are  buried,  encased  in  a  sleeve  or elevated above the ground.
Access to  these  caissons  is  difficult  and  Gwt  has  the ability to inspect the whole length of the Caisson from the top-side.

From the results it was possible to see the end of the caisson at 65m. This indicated that the caisson was in reasonable condition. There was found to be an increased area of corrosion at between 32 and 35m from  the  datum  that  corresponds with the splash- zone.​