Can we run a 6-inch standpipe for a highrise building (24-story) fully on an external wall? The main would come out of the pump room and take branches for each floor from the riser. This new building has a major space shortage and it's not possible to run the pipe within a shaft inside the building. There is no issue of freezing as the temperature does not drop to the freezing point.
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12/17/2019 10:06:15 am
Unless it's prohibited by the standard or the building department. I am working on a project is California and the city manager does not allow for exposed exterior risers of any kind and backflow preventors need to be behind a privacy screen.
12/17/2019 10:57:56 am
There is no room in the stair for a 6" riser? How? something is missing here.
12/17/2019 11:40:24 am
A 24 story tower would require a standpipe and associated hose valves, floor control valves and system drain, There would usually be 2 means of egress via 2 stair towers, the standpipes would typically be installed within the stair tower, in a corner, so as not to interfere with the means of egress. The stair tower installation also allows the fire department access to the required hose valves at each floor at the intermediate landing - code mandated - or floor landing depending on your AHJ's preferences - I've designed for both depending on what the AHJ wants.
12/17/2019 02:49:41 pm
I have done temporary construction standpipes on the exterior of a building, as a dry manual standpipe. They are removed when the permanent standpipe is activated.
12/17/2019 02:56:30 pm
If the standpipe is designed/installed in accordance with NFPA 14, then it is required to be protected by NFPA 14 (2019) 220.127.116.11.1. The three options include (1) enclosure in a fire-rated exit stairway, (2) enclosure in fire-rated construction equal to the stairway, or (3) fire-wrap or other insulating material directly to the pipe that equals the rating of the fire-rated exit stairway.
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