Leak DetectionLeak Detection Systems. Tank …

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. 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.

2 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). 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. Courtesy y of Royal y Chiltern Air Support pp Unit Private and Confidential The Solution Private and Confidential 10.

3 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. 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.

4 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. 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. 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.

5 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. 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.

6 - ATEX Intrinsic Safe system certificate - Compatible with a redundant secure network: RS485, fiber optic . 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. 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.

7 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. times 250 meters) of TT5000 cablebl aroundd the h perimeter of the tanks . Benefits: the tanks will be monitored 24h a day day, 7. days a week. Private and Confidential 35. Less Expensive Perimeter Monitoring Used when the cost of horizontal boring beneath existing tanks is too expensive or too risky. Solution: Sensor cable is placed l d iin a ttrench h around d the perimeter of each tank. Benefits: the tanks will be monitored 24h a day day, 7. days a week but only leaks reaching perimeter are detected Private and Confidential Hidden leaks under control Private and Confidential 37. Hidden leaks under control Private and Confidential 38. Buried Valves Large or Small Sensor cable is installed in slotted PVC J.

8 J tube under valve body to detect leaks from flanges and valve stem and drain tubes Private and Confidential Buried Valves and Manifolds Private and Confidential Thick Wall / Cable Type Sensors Longg circuit,, continuous sensor Excellent under tanks , along pipelines, in-soil applications Location of spill reported along with Detection Ignores ground water Private and Confidential 41. Fast Fuel Sensor Private and Confidential 42. Fast Fuel Sensors ( FFS). Sensor/Circuit Board Fits Inside Leader Cable to Control PVC Housing Unit Component Area Encapsulated in Epoxy Top Electrode Sensor Area Slots for liquid Bottom Electrode PVC Housing Protection Screen Front Side Back Side Side View Private and Confidential 43. Fast Fuel Sensors ( FFS). Normal (Dry) Condition >> Wet Condition >> Output to Output to TraceTek system is TraceTek system is high high resistance = NO LEAK resistance = NO LEAK. Water Resistance path through sensor Resistance path through sensor material is low material is low Private and Confidential 44.

9 Fast Fuel Sensors ( FFS). Fuel Spill >> Output to Fuel on Water Condition >>. TraceTek system is low Output to TraceTek system is resistance = LEAK low resistance = LEAK. Fuel W t Water Resistance path through sensor Resistance path through material is high sensor material is high Private and Confidential 45. Floating hydrocarbons Detection Real liquid hydrocarbon sensor - No false alarms with water even withith h heavy rain i - No anti wave system needed - 10 or 20 cm height sensors - Fast reaction time - Can be reset, reusable - Industrial floats available - Can be installed in Ex zone 0. - Can be used in a SIL2 loop Private and Confidential 46. Tank critical scenarios 1 O. 1. Overfill fill Roofs 3 Leaks (mixer, 3. (mixer flange, flange valve or pipework) 4. Roof drain and tank drain failure Large spill => explosion => fire Protection measures: collecting system and liquid Detection on collectingg system : y TT-FFS. Private and Confidential 47. Quickly detect a fuel spill in time to g activate the emergency y response p plan p Pictures from the Buncefield Investigation g Information Desk internet website.)

10 Courtesy y of Royal y Chiltern Air Support pp Unit Private and Confidential 48. Floating Roof Leaks The need: Detect fuel on roof surface after failure of ring seal Detect fuel backing up through rain drain and accumulating on roof Private and Confidential Plot Plan PARADIP REFINERY Core Processing Units Private and Confidential W:D151/a/prop nos/32870/G/Spectrum 03_05 (Rev01). Thin Film / Point Sensors Fast Reusable, easy to test Private and Confidential 51. TT- FFS Fast Fuel Sensor Drip Pan Installation in UK. Private and Confidential Supervising network Digital network between sensing cables interfaces and central processing units Compatible C tibl with ith F. Fastt ffuell sensors Private and Confidential 53. Battery Powered Flasher Uses 3 high efficiency LED's Good visibility in the dark and day light When the sensor cable is contacted by the appropriate pp p liquid, q , the LED's will begin g to flash Flashing will continue for at least 30 days Each unit comes equipped q pp with a TEST key y that can be turned on to verify batteries and Undamaged sensor cable is connected The batteries need to be replaced once a year Low batteries indication show a double flash.