1 / 16

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.

nhu
Download Presentation

NACE International Eastern Regional Conference

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 ?

More Related