I had always thought that couplings didn't need to be calculated under NFPA 13, but I'm reviewing a set of calculations which show 1-foot of schedule 40 equivalent for each coupling. This is for a 4-inch main with roll-groove couplings. Any ideas?

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Have a project where the client is wanting fully-concealed sprinklers, but the project is insured under FM Global. FM does not approve any fully-concealed sprinklers as quick response.

However, under NFPA 13, light hazard spaces are required to have quick response sprinklers.

How do you normally address this conflict?

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For a flight simulator inside a larger building, what sprinkler density do you feel would be appropriate for this hazard?

The simulator will be its own contained unit, so the top will likely shield water spray from sprinklers above and prevent water penetration to the inside, much like a vehicle fire would in a parking garage.

NFPA 13 does not address simulators, nor does UFC 3-600-01 or FM Data Sheets (as far as I can tell). In my opinion the closest hazard I can gather would be vehicles in a parking garage which carry an Ordinary Hazard Group 1 designation under NFPA 13 (2016) 5.3.1 and A.5.3.1.

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