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Pipeline Current Mapper PCM+

Radiodetection PCM. Pipeline Current Mapper PCM+. Radiodetection PCM. The PCM can…. Find contacts with other structures Evaluate Pipe Coating for defects Perform periodic Pipeline surveys Find defective Insulation joints. Radiodetection PCM. What is different about PCM.

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Pipeline Current Mapper PCM+

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  1. Radiodetection PCM Pipeline Current MapperPCM+

  2. Radiodetection PCM The PCM can…. • Find contacts with other structures • Evaluate Pipe Coating for defects • Perform periodic Pipeline surveys • Find defective Insulation joints

  3. Radiodetection PCM What is different about PCM • High output power Transmitter • Low Frequency signal • Current Direction of applied signal • Data logging of current measurements • A Frame pinpointing of coating holidays

  4. Radiodetection PCM Benefits of low frequency

  5. Radiodetection PCM Benefits of low frequency

  6. Radiodetection PCM The Transmitter utilises.. • High output power (150W) • Very low frequency • This helps to…. • increase range • reduce coupling to other services • reduce field distortion

  7. Radiodetection PCM The Transmitter • Can be powered from… • 110/240Vac • The D.C output of a rectifier (20 to 50vD.C) • External Automotive batteries (24v to 48V)

  8. Radiodetection PCM PCM Receiver provides.. • Pipe location and depth • Current measurement of survey current • Stores up to 999 readings for download to a PC or PDA

  9. Radiodetection PCM Transmitter connection • Typical rectifier installation. • Provides a perfect pipe connection point • Anode provides perfect ground connection point

  10. Radiodetection PCM Transmitter Connection • Disconnect the rectifier output from both pipe and Anode • Connect the PCM transmitter in place of the rectifier

  11. Radiodetection PCM Setting the Transmitter • Three output settings • 4Hz and 98Hz • 4Hz, 8Hz and 98Hz • 4Hz, 8Hz and 512Hz

  12. Radiodetection PCM Setting the Transmitter • Set Current switch to desired current • The PCM transmitter is a constant current source, this ensures stable survey readings.

  13. Radiodetection PCM 100% 95% Taking current reading • Ensure both PCM receiver is set to the same frequency as the Transmitter • Pinpoint the pipe in the peak Mode

  14. Radiodetection PCM Taking Current Readings • Hold the Receiver Steady on the ground, press and hold the PCM Key. • Current is displayed after approximately 3 seconds

  15. Radiodetection PCM PCM current v Line Drops

  16. Radiodetection PCM Current Direction • This tells you in which direction the Current is flowing • Aids fault analysis

  17. Radiodetection PCM Datalogging • 999 readings can be stored • Stored readings can be reviewed on PCM+ or downloaded to PC • Downloaded files are in text format and can be displayed using Excel or 123 speadsheets

  18. Radiodetection PCM Pinpointing Coating Defects • For accurate coating defect location use the A Frame

  19. Radiodetection PCM Finding Coating Defects

  20. Radiodetection PCM Case Histories

  21. Radiodetection PCM

  22. Radiodetection PCM Defects found by PCMCut away ready for repair

  23. Radiodetection PCM Close up view of cutaway showing area of metal loss

  24. Radiodetection PCM Cables in contact with pipe

  25. Radiodetection PCM Sheet pile in contact with pipe

  26. Current Attenuation Graph Actual PCM Results 3 steps are different looking in mA but nearly identical in dB

  27. AC Voltage Gradient • Can be part of Current tools • Becoming very popular • Extreme sensitivity • Rejection of interference • Very accurate location of faults • typically better then 6" • Sometimes part of Current Attenuation equipment • This method deserves to be considered as a solid tool for integrity and the ECDA process.

  28. ACVG in Operation • Both signal strength and direction arrows lead user to holiday. • Fault value is proportional to holiday size and soil resistivity.

  29. Pool of Potential Is AC, but at any instant in time, there is a direction.

  30. ACVG Receiver Theory

  31. ACVG Tuning • Older systems used a simple DMM • Does not tune to any one frequency • 60 Hz, cable earth faults, telecom noise Rx’d • Very tight tuning in the signal generator and receiver effectively increases sensitivity as it ignores current from other sources • SNR improves

  32. In this case the next fault was quite close (20-30m) which is why the left side of graph climbs quickly. • Other cases may show 100s of meters of signal at 30 and under..

  33. Dig Pictures

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