A client of ours operates a printing press facility and has installed a machine to collect and form dust into "bricks" to avoid venting them to atmosphere.

The machine is fed by ducts that tap into an existing dust collection system. 

The client asked for a quote to adjust the overhead sprinkler system because of the new ducts but I think the new ductwork and machine might require suppression of some form, as well as interacting with the existing sprinkler system at the roof. 

(1) Does NFPA 13 (2016 Edition) Section 11.2.3.2.2.2 indicate that the existing roof system cannot have quick response sprinklers?

"Quick-response sprinklers shall not be permitted for use in extra hazard occupancies or other occupancies where there are substantial amounts of flammable liquids or combustible dusts."

It's hard to tell from the floor but I believe at least some of the systems have quick response. 

(2) Is the dust collector ductwork governed by NFPA 13 at all?

Section 22.33 Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids would not seem to apply since the particulate dust is a paper product and inherently combustible.

(3) Are dust collector machines like paint booths in that manufacturers pre-coordinate requirements and access for sprinklers into the filter media?

Thanks for all the guidance; I haven't seen this application before.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe

I have an exhaust system serving a welding and metal fabrication lab at a school. They will utilize 70% ferrous metal and the remaining will be a mixture of stainless steel, coated steel and aluminum.

The largest duct diameter at the building exit is 30" round. The dust collector will be located on the exterior of the building and in a freezing environment.

Will I need to provide fire suppression within the ductwork both inside and outside as well as within the dust collector?

​​​Sent in anonymously for discussion. Discuss This | Submit Your Question | Subscribe