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High Sensitivity External Leak Detection for Liquid Fuel Pipelines

High Sensitivity External Leak Detection for Liquid Fuel Pipelines. David Parman P.Eng. Ken McCoy. Pipeline Leak Detection. The Problem : How can we minimize environmental damage caused by small leaks in liquid fuel pipelines that go unnoticed for long periods? The Solution :

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High Sensitivity External Leak Detection for Liquid Fuel Pipelines

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  1. High Sensitivity External Leak Detection for Liquid Fuel Pipelines David Parman P.Eng. Ken McCoy

  2. Pipeline Leak Detection The Problem: How can we minimize environmental damage caused by small leaks in liquid fuel pipelines that go unnoticed for long periods? The Solution: High Sensitivity External Leak Detection (HSELD)

  3. What is an HSELD system? • A system that operates independently of the pipeline • A system that directly detects leaked liquid using a continuously distributed, high sensitivity sensor • A system that monitors its own integrity and checks for leaks on a 24/7 basis • A system that compliments existing flow based leak detection to minimize your leak risk exposure

  4. Periodic inspection and testing • Periodic tightness testing • Right of way over-flights / Line Patrol • Smart pigs • Public discovery At RISK ! = Environmental Protection Risk

  5. SCADA (Flow Based) Leak Detection • Response time is faster for higher leak rates • Greater leak sensitivity leads to more risk of false alarms • End User experience indicates good performance only down to about 1~2% of flow

  6. Spill size increases for slower leaks At RISK !

  7. Combining SCADA with periodic testing helps but… 60days 30days 7days SCADA Periodic Inspections HSELD Environmental Protection Gap

  8. At Risk area is substantially reduced by HSELD

  9. External Direct Measurement Positioned alongside the pipeline Installed into PVC well screen pipe High Sensitivity sensor cable

  10. How it works 21 20 10 5 3 1 Detection at 21 hours 0 Time (hours) Animation based on 10 liter/hour leak rate (0.001% of flow), 66% solids

  11. Field demonstration Tests demonstrate TT5000 detects milliliters of fuel floating on water.

  12. Test results

  13. Wilcox test details

  14. Project Design Considerations • Trench style / construction • Soil type • Ground water conditions • Degree of environmental protection required

  15. Trench Type

  16. Ground water considerations

  17. Where can you use HSELD systems? • Alongside buried single wall pipelines • Around buried valves • Under above ground storage tanks • On airport hydrant fueling systems • Anywhere you need to reduce risk in High Consequence Areas

  18. AST Applications Typical plan view

  19. Buried Valves and Manifolds

  20. Cross Country Pipelines

  21. Pipeline Project Installation

  22. Installation layout for pipeline 120 VAC External Modbus Link to SCADA Circuit 1 Circuit 2 Circuit 3 Circuit 4 Circuit 5 Circuit 6

  23. Airport Hydrant Fueling Systems

  24. Installation layout for airport hydrant fueling system

  25. Regulatory Considerations • Current regulations do not typically mandate leak detection to the level of HSELD protection • API 1160 recognizes HSELD • Some environmental agencies have formally recognized HSELD system • Public N.I.M.B.Y. campaigns are resulting in greater efforts by operators to exceed regulatory requirements

  26. Florida State Approval “…TraceTek TT5000 leak detection system for single-walled underground bulk product piping will provide environmental protection substantially equivalent to that provided by compliance with the requirements established in Rules…”

  27. Third Party Validation Third party testing of TT5000 “direct bury” system by Ken Wilcox Associates demonstrates that TraceTek works in single wall pipeline applications with Jet Fuel . “In conclusion it must be noted that proper installation and positioning of the sensor, taking into account the local site conditions, is critical to reliable detection of leaks.”

  28. Summary TraceTek High Sensitivity External Leak Detection… • fills the gap between SCADA and periodic testing • Provides 24/7 environmental and system integrity monitoring • Reduces emergency response time by pinpointing leak location • Has been tested, proven and accepted by environmental authorities • Substantially reduces operator risk in high consequence areas

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