PCS-2000/DCVG

The objectives are to:

• Optimise the effectiveness of the installed cathodic protection system.
• Avoid overprotection which can lead to coating disbondment.
• Reduce coating defect sizes to a level where the cathodic protection system can provide full protection.
• Provide a basis for ongoing monitoring of the cathodic protection system and coating.

What the results tell you:

Accurately locates coating defects - The PCS-2000 method is the most accurate and sensitive survey method developed to locate coating defects. It has also been refined to test pipelines in built-up areas using a patented technique.

Defect sizes - Experience has shown that where a pipe is buried at a 1-1.5m (3-5ft.) depth, a 5% IR represents approximately a 12cm2 (2in2) defect. Pipe depth varies the signal strength measured at the surface. Coupons connected to the pipe with known bare areas enables the defects to be calibrated.

Continued coating deterioration - Percentages IR calculated from surface readings are permanent defect benchmark figures which will be noted on subsequent surveys to increase if the coating deteriates further.

Reduciton in protection - The overline to remote earth potential drops can be used directly to determine potential drops at defects.

Priority for refurbishment - Defects with the largest percentages IR are given first priority for recoating. The cathodic protection system should be able to protect the smaller defects. Small defects should be investigated where the pipe is experiencing coating disbondment. Plotting of the defects enables easy assessment of the coating condition and acts as a good management reporting format.

Cathodic protection system adjustment or upgrade - The survey together with test point potentials identifies sections with under or over protection. The latter is frequently found at impressed current system drain points where current outputs have been regularly increased due to reducing protection levels. This is a self defeating practice, as it leads to further coating damage. It may be necessary to provide supplementary protection between rectifier stations in order to even out the spread of protection.
 

Watch PCS-2000 video

Further information can be obtained by e-mailing us.