The document discusses explosion venting and the SMART explosion venting system. It describes explosion venting as a technique for safely relieving pressure from explosions. The SMART system provides flameless, sanitary, targeted, customized and engineered venting solutions. It involves more accurate calculations of vent area that account for factors like wet powder concentration and temperature effects, allowing for smaller vent areas than conventional approaches. The SMART venting device utilizes a reusable flame arrestor and integrated monitoring for increased safety and reliability.

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2. Explosionsschutz
Explosion Protection
SMART Explosion VENTING
-Dr.-Ing. Johannes Lottermann -
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

3. Explosionsschutz
Explosion Protection
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What is explosion venting?
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

4. Explosionsschutz
Explosion Protection
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What is explosion venting?
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

5. Explosionsschutz
Explosion Protection
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What is explosion venting?
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

6. Explosionsschutz
Explosion Protection
Which basic rules do exist?
Rulebooks
 ATEX – 94/9/EG (prevent ignition transmission & keep mechanical resistance)
 NFPA 68, 664, 69, 654, 61 (application hints)
 EN 14491 – Explosion Venting
 EN 16009 – Flameless Explosion Venting devices
 EN 14797 – Flame arrestors
VDI 2263 – Dust fires and dust explosions
 VDI 3673 – Pressure venting of dust explosions
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

7. Explosionsschutz
Explosion Protection
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What kind of venting devices do exist?
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

8. Explosionsschutz
Explosion Protection
What needs to be tested using the example of ATEX?
Venting devices
Acc. to EN 14797:


mechanical integrity
(no missile effect)

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static set pressure
(tolerance within 25%)
venting effiency
(in comparison towards a inertia-less foil)
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

9. Explosionsschutz
Explosion Protection
Where does venting have to be applied?
 Dust collectors, bag houses
 Silos and bunkers
 Mixers
 Blenders
 Cutting machines
 Granulators
 Elevators and chain conveyors
 Dryer
 Sieves and sifters
…
…
…
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

10. Explosionsschutz
Explosion Protection
What does the required vent area influence?

strength of the vessel (pred)

volume of the vessel (V)

type of dust / gas (pmax, KSt bzw. KG)

set pressure of the venting device (pstat)

venting effiencency (Ef = Aeffective/Ageometric)

dimensions of the vessel (L/D-ratio)

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(process conditions)
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

11. Explosionsschutz
Explosion Protection
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How is the vent area calculated?
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

12. Explosionsschutz
Explosion Protection
SMART = FLAMELESS Venting (also for metal dusts !!!)
Stainless steel riveted design allows to
absorb pressure shock
Reusable flame arrester made of a
special stainless steel mesh filter
Stainless steel dust filter with specially
developed pressure absorbing coils
Integraded REMBE rupture disc with
signal unit and gasket
Monitoring unit in cabled IP-65 housing
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

13. Explosionsschutz
Explosion Protection
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SMART = SANITARY Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

14. Explosionsschutz
Explosion Protection
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SMART = SANITARY Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

15. Explosionsschutz
Explosion Protection
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SMART = TARGETED Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

16. Explosionsschutz
Explosion Protection
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SMART = TARGETED Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

17. Explosionsschutz
Explosion Protection
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SMART = CUSTOMIZED Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

18. Explosionsschutz
Explosion Protection
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SMART = ENGINEERED Venting
SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

19. Explosionsschutz
Explosion Protection
SMART = ENGINEERED Venting
Conventional approach for sizing the vent area of spray driers
Volume

Full Volume
KSt-Value

acc. to 20l-sphere values
pmax

acc. to 20l-sphere values
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

20. Explosionsschutz
Explosion Protection
SMART = ENGINEERED Venting
BUT….
Volume

Why is the entire volume taken into account although the upper part is nearly full with wet
powder?
KSt-Value

Why is the „worst case“ pressure rise considered, although the concentrations in the tower are
so much lower than in the 20l-sphere?
pmax

Why is the the maximum pressure considered at roomtemperature, although high temperatures
are reducing the maximum pressure?
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

21. Explosionsschutz
Explosion Protection
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

22. Explosionsschutz
Explosion Protection
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²
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SMART Explosion VENTING
Johannes Lottermann – Explosion Protection Department

23. Vielen Dank für Ihre Aufmerksamkeit!
Many thanks for your attention!
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