Horizantal Standpipe Hose Valves

[GlorifiedPlumber1984]

Question for anyone with better knowledge on this. Per NFPA 14, 2016e, 7.3.2.2.1 and the associated diagram in the annex describe the ability to eliminate a hose valve on the "other" side of a horizontal exit if all areas are reachable by a hose connection in an exit stairway.

If, on both sides of a horizontal exit, there are hose connections from an exit stairway that reach all areas of each side, does this eliminate both hose connections on each side of the horizontal exit?

 

[UFT12]

I would say no. Combining 7.3.2.2 with 7.3.2.2.1, common sense says only one connection can be eliminated, provided 7.3.2.2.1 is satisfied.

On a more theoretical point of view, horizontal exits are dividing the building allowing for less exit stairwells. It is supposed that passing to the other side is equivalent to entering a stairwell. Therefore, if you consider them as equivalent to an exit stairwell, a connection is always required with the exception of 7.3.2.2.1. In addition, if there was no connection at the horizontal exit, in case a stairwell is inaccessible, there would be no chance for the fire fighters to reach a substantial part of the building.

 

[GlorifiedPlumber1984]

That makes sense, thank you. The wording for me at least was a little confusing, and when I was trying to think about the why behind using the code line item on one side but not the other I was coming up blank but a stairwell being inaccessible, causing the need for at least 1 hose connection at the point of exit is very relevant. Thanks again!