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In sub-grade parking garages, with PRV fire hose valves/floor controls - for testing purposes, would you connect a PRV fire hose valve to the express drain via hose and pump vertically to get to the exterior grade to discharge? Are there any issues with this method during testing to consider? PRV floor control would be hard piped to the express drain and utilize the same pathway to the exterior. Then at the bottom of the express drain has a ball valve, acting as an auxiliary drain only. It can discharge to a gravity drain system, whether storm or sanitary, whatever your local AHJ permits. Or is everyone trying to discharge into a gravity drain at the bottom of the stairs and hoping to not flood anything? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe 
7 Comments
Anthony
10/8/2025 07:19:15 am
This drainage solution looks good to me, At some places I've been asked for large floor sinks/basins or a 4-0 length of 8'' before a drain line air gaped between the 1'' outlet to prevent spillage and over flow.
Dan Wilder
10/8/2025 07:42:53 am
This is the way I've done it in the past, but I've also added a velocity check at the base of the drain to handle relief valve discharge....trying not to leave the manual draining to someone when possible.
L Scott
10/8/2025 11:10:53 am
I like that idea, I too was not super thrilled about relying on a manual drain down process.
Jose Figueroa
10/8/2025 10:09:31 am
After reviewing NFPA 25 section 13.5, along with NFPA 13 and 20, I found everything to be acceptable based on the questions and diagram presented. I recommend submitting this to the AHJ for final approval.
Jack G
10/9/2025 03:33:24 pm
Sketch looks okay.
L Scot
10/10/2025 09:11:55 am
The waste system was for schematic purposes and wasn't really the focus, but if it's storm no trap, no vent. If it's sanitary yes a trap & the vent as noted on sketch. Just depends on the municipality on where they want it.
Fernando Pinto
10/16/2025 03:13:21 pm
If your fire stairs have an FRL the sewer pipe could be creating a bypass into the fire stairs (not sure how US codes handle these situations but here down under we have to flag with fire safety engineers for a possible performance solution - also had a rain water outlet in a fire stair which further added to the rabbit hole).... Leave a Reply. |
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