Leak DetectionLeak Detection Systems. Tank Storage ...

1 Leak Detection Systems. Tank Storage Conference - I t b l Istanbul Mohit Agarwal . Regional Manager( India & ME). Private and Confidential Slow Leaks Lead to Big Spills Over Time Most underground leaks are detected only after they are large enough to reach the surface Unfortunately Unfort natel O. Outt of site Out O t of mind'. can lead to very expensive clean-up costs: 1 hour of undetected leak is 315 liters 1 day is 7560 liters 1 week is 53,000. , liters (Spill estimates based on a leak from an 8 transfer line). Private and Confidential The need for a new leak Detection gy technology The need is to detect a fuel leak when the leak size is very small.

2 Real liquid hydrocarbon sensors based Detection and no interpretation. Private and Confidential 3. Fractured tank fractured bottom plate, plate =>. > large spill => Ground subsidence => bund explosion / fire => tank fire Prevention measure: liquid Detection systems under the bottom plate or in the service void : sensing cables buried within slotted pipes Private and Confidential 4. Leak Detection for tanks : Visual Detection or g gauging g g systems? y Detection after 1 month for small tanks (+/- 8 m of diameter). Detection after year for larger tanks (> 38 m of diameter).

3 Private and Confidential 5. Detection of fuel leaks before the tank collapses . Pictures from the VRT internet website. Private and Confidential 6. Applications for Direct Contact Sensors Overfill Detection in UK. Buncefield October, 2008. New tanks have ring moats to catch and temporarily hold any over-fill A Fast Fuel sensor p probe has been fitted inside of moat Sensor ignores rain water if there is no floating fuel Private and Confidential Leak Detection for tanks : Visual Detection or tank g gauging g g systems? y Private and Confidential 8. Quickly detect a fuel spill in time to activate the emergency response plan Pictures from the Buncefield Investigation g Information Desk internet website.

4 Courtesy y of Royal y Chiltern Air Support pp Unit Private and Confidential The Solution Private and Confidential 10. Cables for buried applications - Real liquid q hydrocarbon y sensor - No false alarms with rain water even dissolved hydrocarbons - Suitable for all buried applications - C ti Continuous sensing i - Can be installed in Ex zone 0. Private and Confidential 11. External Direct Measurement Installed into PVC. screen pipe Positioned High Sensitivity sensor cable under tank bottom, beneath valves or along side a pipeline Private and Confidential 12. Tank monitoring Typical plan view Private and Confidential 13.

5 Working g Principle Private and Confidential TraceTek 5000 Series Filler Wire Outer braid diameter in. (7 mm). Sensor Wires Continuity Wires ((black)) ((red and yyellow)). Private and Confidential Page 15. Thick Wall / Cable technology Cable Wall Material: Liquid q Hydrocarbons y PE, EPDM, Carbon Jet, Diesel, Gasoline, + radiation cross linking Crude Oil, etc Private and Confidential Page 16. Thick Wall / Cable Technology Cable Wall Material Still conductive, but now Volume is 200% original Private and Confidential Page 17. TT5000 before fuel contact H2O. Jet A. Note air gap between inner wall of jacket and Gasoline black electrode wires Diesel Private and Confidential Page 18.

6 TT5000 after fuel contact J tA. Jet Private and Confidential Page 19. TT5000 after fuel contact J tA. Jet Private and Confidential Page 20. TT5000 after fuel contact J tA. Jet Private and Confidential Page 21. TT5000 after fuel contact Jet A. Air gap between inner wall of jacket and black electrode wires has collapsed. ll d D. Detection t ti occurs !!! Private and Confidential Page 22. TT5000 after fuel contact Detection current flows through jacket. Leak is detected and located Elapsed time since J tA. Jet initial contact <60 min (Jet-A @ 20 C). Fuel needed for Detection < 1 ml Private and Confidential Page 23.

7 TT5000 Detection and Location I. V. I (current). ( t) is i monitored it d tto d detect t t a leak l k eventt V (voltage drop along the cable) is measured to locate the leak point of contact p Private and Confidential Page 24. Cables Operating Principle Leak 120 m 18:57 16-Feb-05. I . Private and Confidential Page 25. TraceTek TT5000 monitoring Private and Confidential 26. Underground leak scenario 30. 20. 10. 5. 3. 0. Time Detection after 30 days (days). Animation based on liter/hour leak rate Private and Confidential 27. TTDM-128 Alarm Panel 28. Private and Confidential Private & Confidential TTDM-128 Features Stand Alone Alarm Panel and User Interface Local Display of all Leak Detection Parameters: Leak Location, Time of Detection etc.

8 Capacity to manage up to 128 TTSIM channels Event History: leaks, trouble alarms, set-up changes, etc. Summary Relay outputs: Leak Detected Service Needed Trouble Complete Modbus interface via RS232/RS485 to Host Computer for remote monitoring. 29. Private and Confidential Private & Confidential TT-SIM 1A control unit - Can be included in a ATEX d Flameproof enclosure to reduce the Intrinsic safe network length - Compatible with MTL7767+. Zener barrier - Can be installed in zone 1 with a ATEX d enclosure . - ATEX Intrinsic Safe system certificate - Compatible with a redundant secure network: RS485, fiber optic.

9 Private and Confidential TTDM-128 with TTSIM-1A or TTSIM-2. TTSIM-1A (additional TTDM, TTDM-PLUS Sensor Interface TTSIM, or TT-NRM). TraceTek Network Master CH01 SIM. SIM Normal 13-May-2002 15:30. TTDM. 13 14 15 16 17 20 21 22 23 24. RS+. RS+. RS. RSAC. AC. SHLDAC. SHLD. TTSIM-1A. AC. Leak Location Module RATING: 50/60 Hz Network Address 24 Vac 10%. 3VA. RED. GRN. YEL. BLK. GND. 8 9 10 11 12. RS-232 or RS-485 modbus link to host S i Cable Sensing C bl Sensing Cable RS-485 2 wire network Condensate Drain Valve Private and Confidential 2 31. November 2010. Local Dedicated PC Monitoring 32.

10 Private and Confidential Private & Confidential TT-Supervisor p Features Windows application directly connected to TraceTek system Monitors up to 31 TTDM-128 panels with or without attached SIM networks Di Direct monitoring i i up to 124 TTSIM units i All events logged on local disk Screens for: Real Time Status Display by Channel Active Alarms Event History Links to graphic files ( system maps) and text files 33. Private and Confidential Private & Confidential AST Tank Floor monitoring Private and Confidential 34. Hidden leaks under control The major risk is to have an undetected leak under one of the four crude oil tanks in a French refinery The solution has been to bury one kilometer ( 4.)