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NACE International Eastern Regional Conference

NACE International Eastern Regional Conference. Presented by James B. Bushman, P.E. Bushman & Associates, Inc. Corrosion Consultants – Medina, OH 44256 www.bushman.cc at the 2009 NACE International Eastern Regional Conference. REMOTE MONITORING of CP FOR PIPELINES AND TANKS.

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NACE International Eastern Regional Conference

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  1. NACE InternationalEastern Regional Conference Presented by James B. Bushman, P.E. Bushman & Associates, Inc. Corrosion Consultants – Medina, OH 44256 www.bushman.cc at the 2009 NACE International Eastern Regional Conference REMOTE MONITORING of CP FOR PIPELINES AND TANKS

  2. REMOTE MONITORING CP FOR PIPELINES & TANKS • Why use remote monitoring? • Save money • More accuracy • More data • Obtain readings we can’t easily take • Increased frequency of readings • Spend our time problem solving rather than meter reading

  3. REMOTE MONITORING CP FOR PIPELINES & TANKS What do we want to read? • Rectifier DC Voltage and Amperage • Pipeline Potential • Test Station and/or Coupon Readings • Critical Bonds

  4. REMOTE MONITORING CP FOR PIPELINES & TANKS • Rectifier Voltage: • 00.0 VDC • Rectifier Amperage: • Across shunt resistor • (preferably 1 Ampere per Millivolt) • Measure mVs to 0.1 mV • Structure Potential • With permanent (??) reference electrode • On & Instant Off • Interrupt Capable (with GPS Sync)

  5. REMOTE MONITORING CP FOR PIPELINES & TANKS • Rectifier AC Power: • XXX volts • Rectifier Temperature: • Thermocouple measured in mV • Read how often vs. report how often? • Any Other Readings??

  6. REMOTE MONITORING CP FOR PIPELINES & TANKS • Resolution: • Digital Store and Transmit Resolution – Uses A to D converter – generally uses XXXX bit resolution • 12 bit resolution = 2^12 = 4096 segments over range • 16 bit resolution = 2^16 = 65,536 segments over range = 0 to 4 volt range can measure to 0. 1 mV • +/- versus 0 to X • Using 16 bit resolution and +/- 4 Volt range, can only resolve to 1 mV • If I instead use 20 bit A to D converter, 1,048,576 segments over range,can read +/- 4 Volt range to 0.01 mV

  7. REMOTE MONITORING CP FOR PIPELINES & TANKS • Accuracy: • Digital Store and Transmit Accuracy • e.g. 0.5% of reading or • 0.1% of reading ±3 digits or whatever • Temperature & Environment Limits: • Temperature Operating & Storage Limits for stated Accuracy & for Failure • Raintight • Waterproof

  8. REMOTE MONITORING CP FOR PIPELINES & TANKS • Power Supply • Usually AC Powered • Rechargeable battery backup • How many hours operation while AC out? • Can send auto alarm? • Stored Data & Operating Parameters in non-volatile memory?

  9. REMOTE MONITORING CP FOR PIPELINES & TANKS • Other desirable features for Rectifiers • Synchronized Interrupter • Time stamp for reading • Temperature monitor • Output adjustment • Remote download of operating and monitoring parameters • Min/Max Error Reporting • Alarm signals • Any other suggestions?

  10. REMOTE MONITORING CP FOR PIPELINES & TANKS • Test Stations • On Potential • Synchronized “Instant-Off” Potential • Polarization Decay (leave impacting rectifiers off for 4 or more hours?) • Coupons • On Potential • Instant-Off Potential • Polarization Decay

  11. REMOTE MONITORING CP FOR PIPELINES & TANKS • Critical Bond Test Stations • Current Flow in Bonds • Measure in ± mV • Measure to 0.01 mV • Coupon (both On and Instant Off)

  12. REMOTE MONITORING CP FOR PIPELINES & TANKS • Test Station Power • Solar/Battery • Long Life Battery

  13. REMOTE MONITORING CP FOR PIPELINES & TANKS • Acquisition of Data • SCADA • Satellite • Cellular Phone or Side Bands (Texting Channels) • Drive-By Radio • Line of Site • To high tower and then SCADA to Central Area • Unit to Unit to Central Monitor

  14. REMOTE MONITORING CP FOR PIPELINES & TANKS • Transfer/Processing/Analyzing of Data • Who supplies software? • What kind of Analysis? • What format? • How much customization is available in preformatted form?

  15. REMOTE MONITORING CP FOR PIPELINES & TANKS • What about Reliability? • Warranty • How Long? • On-Site • What is included • What is not included • What about Software Upgrades • What about Continued Support for Installed System

  16. REMOTE MONITORING CP FOR PIPELINES & TANKS • Questions ?

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