stage 3 of project to computerize cathodic protection

1. Technotoy 3
Computerization of Cathodic
Protection

2. Close Interval Potential Survey

3. I helped to develop this in the
1980’s
• http://www.pipeline-corrosion-
control.co.uk/Nigeria/ProcHTML/proc6.htm

4. Trace from a recording voltmeter

5. The very first CIPS survey in the
world

6. Thumb nail sketch

7. I invented the recorded Pearson
Survey
• Part of the actual record.

8. Present day CIPS results

9. The real voltages

10. How the instrument software
displays the information

11. We see the dots joined

12. These are NOT WAVEFORMS

13. These are waveforms.

14. recording voltmeter in the early
1980's.

15. From 1983

16. Typical present day report

17. The reality of the recorded voltages

18. What the meter ‘sees’ and
samples.

19. On and off voltages

20. Volts v time (distance) plot.

21. How the software sorts data.

22. How software presents data

23. Modelling difficulties

24. Measuring circuit

25. How we measure

26. How we must analyse.

27. What science demands

28. Pipe metal potential v ground
potential.

29. The ground has a variable
potential.

30. We must enter the correct data.
• CIPS can only measure voltages.
• These voltages are between two variable
potentials.
• The potential of the pipeline metal can
fluctuate.
• The potential of the ground contact point
can vary over time and distance.
• A computer must have a zero because it is
an adding machine.