We have an internal discussion agreeing to disagree, regarding protection of a non-flammable powder coating booth in a tenant building with existing sprinkler system.
We are installing a dedicated auxiliary wet system dropping down with a loop to pick up a valve for an OHII system per NFPA 33 (2016) 9.4.2 (2). Protection Automatic Systems - Powder coating operations.
First Question - Section 9.2.1 and 9.7.1 indicates there must be a means to accomplish all of the following:
To accomplish the above one side of the office believes a flow switch is needed to accomplish this requirement with double set of contacts.
The other side of the office contends the existing alarm system is adequate enough and if activated the main flow switch will accomplish this. The argument is if this is a dedicated auxiliary system with potential multiple tenants and requires the water flow switch for the Aux Booth System to activate per 9.2.1 and 9.7.1 as noted.
Is this correct?
Question 2 - if a flow switch is required to accomplish 9.2.1 there shall be a means to test with inspector's test connection or a riser manifold with a combination inspector's test & drain at the new dedicated auxiliary riser. Is that correct?
There needs to be an indicating control valve per 9.4.5 operable from floor level for the Aux. Booth System.
Question 3 - can the valve be chained and locked open or does this control valve need electrically supervised open.?
Does there need to be a main drain for this auxiliary system?
I think everyone can follow the arguments so would appreciate some responses. Much appreciated.
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3/16/2023 08:13:02 am
Question 1) you can't use the riser flow switch because of the requirement for a 'local alarm.' The flow switch will provide a 'general' alarm.
Todd E Wyatt
3/16/2023 08:48:46 am
The scoping Code (e.g. 2021 IBC) includes the following reference to “PAINT SPRAY BOOTHS” and associated “WATERFLOW SWITCHES” :
3/16/2023 09:06:32 am
Not a FA Guy...but we have done several booths, enclosed equip (tire carousels and the like) and small modular mezzanines with aux systems due to the temporary or potential for relocation of the unit so IMO...
3/16/2023 10:26:10 am
Dan summarized it well.
3/16/2023 10:46:20 am
I think Dan and Franck summarized it very well. I like the idea of a localized flow switch.
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