Safe Position of Explosion Vents

Posted in: , on 9. Jul. 2009 - 13:15

Safe Position of Explosion Vents

Welding work on starch silo

Type of dust

Corn starch

Description of the plant and process

•Silo (1) protected by an explosion vent (2). Outlet isolated by an explosion-proof rotary valve (3), inlet by a fast acting valve (4).

•Silo installed inside building.

•Pneumatic filling of silo with starch powder.

Course of the incident

Welding on the silo wall (1) during filling operation resulted in a dust explosion. Consequences

•The venting (2) of the explosion into the production building damaged the roof. The welder was seriously injured by falling debris.

•The silo (1) was not damaged by the explosion as the vents

were adequately sized.


•The welding work ignited the dust cloud which was present

as the plant was being operated.

•The pressure wave from the uncontrolled venting of the dust explosion into the room severely damaged the roof.


•The explosion vents (2) must be ducted to a safe area

(ducted to outdoors).

•A much more state-of-the-art solution is Flameless Venting which allows to relief explosion pressure indoors.

•Welding work at operating plants shall be prohibited!

•Welding (and other hot-work e. g. grinding) in areas where there is a possibility of an explosible atmosphere must be controlled by a 'hot-work' permit system. Permit-to-work systems should

include special procedures to ensure both that no explosible dust/air mixture can form and that no combustible material can be ignited.

You learn more comprehensive knowledge of industrial explosion protection in the latest BOSS (REMBE®’s Booklet of Safety and Security).

For more information, please visit:

Additional information:


rembe_1_1 (JPG)

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