SMART Explosion Venting

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

1. 24.10.13Page 1

2. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 2
SMART Explosion VENTING
-Dr.-Ing. Johannes Lottermann -

3. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 3
What is explosion venting?

4. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 4
What is explosion venting?

5. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 5
What is explosion venting?

6. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 6
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

7. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 7
What kind of venting devices do exist?

8. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 8
What needs to be tested using the example of ATEX?
Venting devices
Acc. to EN 14797:
 static set pressure
(tolerance within 25%)
 mechanical integrity
(no missile effect)
 venting effiency
(in comparison towards a inertia-less foil)

9. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 9
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
 …
 …
 …

10. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 10
What does the required vent area influence?
 strength of the vessel (p
red
)
 volume of the vessel (V)
 type of dust / gas (p
max
, K
St
bzw. K
G
)
 set pressure of the venting device (p
stat
)
 venting effiencency (E
f
= A
effective
/A
geometric
)
 dimensions of the vessel (L/D-ratio)
 (process conditions)

11. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 11
How is the vent area calculated?

12. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 12
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

13. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 13
SMART = SANITARY Venting

14. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 14
SMART = SANITARY Venting

15. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 15
SMART = TARGETED Venting

16. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 16
SMART = TARGETED Venting

17. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 17
SMART = CUSTOMIZED Venting

18. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 18
SMART = ENGINEERED Venting

19. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 19
SMART = ENGINEERED Venting
Conventional approach for sizing the vent area of spray driers
Volume
Full Volume
K
St
-Value
acc. to 20l-sphere values
p
max
acc. to 20l-sphere values

20. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 20
SMART = ENGINEERED Venting
BUT….
Volume
Why is the entire volume taken into account although the upper part is nearly full with wet
powder?
K
St
-Value
Why is the „worst case“ pressure rise considered, although the concentrations in the tower are
so much lower than in the 20l-sphere?
p
max
Why is the the maximum pressure considered at roomtemperature, although high temperatures
are reducing the maximum pressure?

21. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 21
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²

22. Explosionsschutz
Explosion Protection
Johannes Lottermann – Explosion Protection Department24.10.13 SMART Explosion VENTINGPage: 22
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²

23. 24.10.13Page 23
Vielen Dank für Ihre Aufmerksamkeit!
Many thanks for your attention!