13.04.23Page 1

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 2

SMART Explosion VENTING

-Dr.-Ing. Johannes Lottermann -

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 3

What is explosion venting?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 4

What is explosion venting?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 5

What is explosion venting?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 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

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 7

What kind of venting devices do exist?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 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)

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 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 … … …

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 10

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)

(process conditions)

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 11

How is the vent area calculated?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 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

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 13

SMART = SANITARY Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 14

SMART = SANITARY Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 15

SMART = TARGETED Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 16

SMART = TARGETED Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 17

SMART = CUSTOMIZED Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 18

SMART = ENGINEERED Venting

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 19

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

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 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?

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?

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 21

SMART = ENGINEERED Venting

VZ = 127m²

VK = 72m²

ExplosionsschutzExplosion Protection

Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 22

SMART = ENGINEERED Venting

VZ = 127m²

VK = 72m²

13.04.23Page 23

Vielen Dank für Ihre Aufmerksamkeit!

Many thanks for your attention!