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SMART Explosion Isolation

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Johannes Lottermann, Head of Projects and Expansion, REMBE, GmbH

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SMART Explosion Isolation

  1. 1. Page 1 24.10.13
  2. 2. Explosionsschutz Explosion Protection SMART Explosion Isolation -Dr.-Ing. Johannes Lottermann - Page: 2 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  3. 3. Explosionsschutz Explosion Protection Page: 3 24.10.13 Why? SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  4. 4. Explosionsschutz Explosion Protection Page: 4 24.10.13 Why? SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  5. 5. Explosionsschutz Explosion Protection Why? „Explosion venting is only half the battle!“ Page: 5 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  6. 6. Explosionsschutz Explosion Protection Basic rules Rulebooks  ATEX – 94/9/EG (prevent ignition transmission & keep mechanical resistance)  NFPA 68, 664, 69, 654, 61 (application hints)  EN 15089 – Explosion isolation systems  EN 16020 – Explosion diverters  EN ISO 16852 – Flame arrestors  EN XXX – Explosion isolationg flaps (proposed release in 2012) VDI 2263 – Dust fires and dust explosions  VDI 3673 – Pressure venting of dust explosions Page: 6 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  7. 7. Explosionsschutz Explosion Protection Explosion Isolation What does the term „explosion isolating devices“ cover?  No flamerelease e.g. via filling devices of tanks for combustible liquids  No explosion propagating e.g. via duct work, screw conveyors, elevators  No broad-flame jet ignition in downstream enclosures  No pressure piling in downstream enclosures  No transition to detonation (supersonic / 30 barg) e.g. in the duct work Page: 7 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  8. 8. Explosionsschutz Explosion Protection Page: 8 24.10.13 The shock wave…. SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  9. 9. Explosionsschutz Explosion Protection Page: 9 24.10.13 …is faster than the flame front! SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  10. 10. Explosionsschutz Explosion Protection Page: 10 24.10.13 Pressure Piling and broad-flame jet ignition SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  11. 11. Explosionsschutz Explosion Protection Explosion Isolation passive isolation systems without additional monitioring- and triggering systems Page: 11 24.10.13 SMART Explosion ISOLATION active isolation systems with additional monitoring- and triggering systems Johannes Lottermann – Explosion Protection Department
  12. 12. Explosionsschutz Explosion Protection Explosion isolation partial isolation systems only isolate pressure effects or flame propagation e. g. flame front diverter chemical barrier Page: 12 24.10.13 SMART Explosion ISOLATION complete isolation systems pressure effects and flame propagation e. g. Quench Valve Q-Flap Johannes Lottermann – Explosion Protection Department
  13. 13. Explosionsschutz Explosion Protection Passive complete isolation systems Q-Flap PLUS St 2 + VENTEX Valve Page: 13 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  14. 14. Explosionsschutz Explosion Protection Page: 14 24.10.13 Passive complete isolation systems SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  15. 15. Explosionsschutz Explosion Protection Page: 15 24.10.13 Passive complete isolation systems SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  16. 16. Explosionsschutz Explosion Protection Page: 16 24.10.13 Passive complete isolation systems SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  17. 17. Explosionsschutz Explosion Protection Page: 17 24.10.13 Passive complete isolation systems SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  18. 18. Explosionsschutz Explosion Protection Active partial explosion isolation systems Chemical barrier Extinguishing agent bottle detector Pressure wave / flame front Page: 18 24.10.13 SMART Explosion ISOLATION High rate discharge Johannes Lottermann – Explosion Protection Department
  19. 19. Explosionsschutz Explosion Protection Active complete explosion isolation systems Fast acting valves Page: 19 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  20. 20. Explosionsschutz Explosion Protection Active complete explosion isolation systems Easy isolation with EXKOP und Quench Valve Infomation: - fast decoupling of pipes - easy handling - no experts needed for Reset Page: 20 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  21. 21. Explosionsschutz Explosion Protection Active complete explosion isolation systems Spark quenching with EXKOP Produktstrom Exkop-controller Filter IR-unit Product Page: 21 24.10.13 SMART Explosion ISOLATION QV Johannes Lottermann – Explosion Protection Department
  22. 22. Explosionsschutz Explosion Protection What do you have to consider? In general:  min./max. mounting distance  dust type and safety values (KSt, pmax, pred, organic/inorganic)  position (horizontal/vertical) When using active systems:  sensor type (flame/pressure/BIRD)  mounting distance of sensors Page: 22 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  23. 23. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances The minimum distance… to the protected enclosure depends on the velocity of the explosion flames and the response time of the detection and closing time of the isolation system  The maximum distance… to the protected enclosure arises from the possibility of deflagration transition to detonation  Page: 23 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  24. 24. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances Calculating the minimum mounting distance sensor barrier tb ta te L, td t a + tb < t e + t d Page: 24 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  25. 25. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances But always consider: The Flamefront varies with ignition starting point! ms ft Page: 25 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  26. 26. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances Worst case when using pressure detectors  start next to outlet slow pressure raise in case of low KSt-Values  long mounting distance requiered due to late detection of pressure wave  Worst case when using IR-detectors  start in the vessel  Page: 26 long mounting distance due to late detection of flame and high flame speed 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  27. 27. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances Solution: Detection via both – pressure and IR-detectors short mounting distance due to low flame velocity in case of explosion starting at the outlet (detection via IR-sensor)  short mounting distance in case of explosion starting in the vessel via early pressure detection  Page: 27 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  28. 28. Explosionsschutz Explosion Protection Expert knowledge: Mounting distances Maximum mounting distance = Transition of deflagration to detonation  Gases / hybride mixtures: 40 x diameter of ductwork max. 15 m / 50 ft  Dusts: 80 x diameter of ductwork max. 20 m / 65 ft Page: 28 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  29. 29. Explosionsschutz Explosion Protection Expert knowledge: Explosion isolation Did you know… that an explosion isolation is not required under certain conditions for pipelines length < 20 ft and diameter < 1 ft (NFPA 68 / VDI 3673)  that flames are expected to propagate up to 80 ft even in „total clean“ pipes due to transporting of uncombusted dust in front of the flames (VDI 1272)   that the explosion severity increases with increasing pipe diameter (VDI 975) that flames are expected to propagate up to 40 ft even in very small pipelines (1“) (VDI1601) – (contradiction to NFPA 69 – A 11.2)  that NFPA is the only standard that allows venting of gas and dust deflagrations in pipes instead of explosion isolation (NFPA 68 – A 9.1)  Page: 29 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  30. 30. Explosionsschutz Explosion Protection Aside: Venting device as isolation device Clean gas Q-Box II (without bursting disc for return air isolation) Q-Flap Raw gas Rotary valve Dust discharge Page: 30 24.10.13 SMART Explosion ISOLATION Johannes Lottermann – Explosion Protection Department
  31. 31. Vielen Dank für Ihre Aufmerksamkeit! Many thanks for your attention! Page 31 24.10.13

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