I have been watching the forum for a while, but this is my first post. So, here goes .
Our industrial customer would like to convert an existing, indoor spray booth with an air-wash filtration system to a dry filtration system (air filters only). The booth area is about 750 ft². Make-up air is supplied from plenums in the ceiling. Most of the floor is steel grating over a sump where the air-wash water accumulates, and the exhaust air exits the spray booth. The sump leads outside the building, below the exterior wall, and then opens up to the grade where the air-wash plenum is mounted on top. The material applied is a water-based primer (20%-40% solids), for aluminum aircraft panels, that contains chrome. Yes, it is nasty stuff. And, it covers the entire floor as a yellow powder. The spray booth is already sprinklered. But, to replace the air-wash system, we plan on installing two-piece arresting filters under the existing floor grating in two locations and blanking off the remaining area. A new HEPA filter plenum will be installed in place of the existing air-washer; outside on top of the sump. And, pre-filters will now be installed in the spray booth ceiling plenum. Anyone have experience, with a similar setup, they would be willing to share? Im thinking the now dry sump (exhaust path) will need to be protected as an Extra Hazard, Group 2 area. And, some or all of the sprinklers will need to be intermediate level/rack storage type due to being under open grating, even though they have the arresting filters or blanking plates overhead. And, Im planning on requiring UL 900 listed air filters. One thing Im not sure of is whether the thin cellophane or paper bags for covering the sprinklers (NFPA 33 9.4.1) are the way to go for protecting the sprinklers against overspray. Does anyone have any history with these? Thanks in advance, ~David Knifton, P.E., LEED AP Rawlings Mechanical Corp. Ph: (323) 875-2040 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20130110/20896548/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
