I have an existing pipe schedule system in a partially sprinklered
building...installed in 1969. I am doing a life safety analysis that includes
budget estimating to provide new fire alarm and sprinklers. The existing pipe
schedule portion of the system is considerably higher in elevation and remote.
It doesn't work hydraulically with the city supply. Even when I replace the
system with larger pipe I can't get the calc to work.
In order to install a new system or keep the existing system in place and have
it hydraulically "work" we will need to install a fire pump. My problem is,
the owner may decide to just upgrade the fire alarm system and not sprinkler
the building if we need a fire pump as the sprinkler retrofit is voluntary.
My question for the Forum is, can an existing pipe schedule system be left in
place even if we retrofit the rest of the building and hydraulically prove the
rest of the building?
NFPA 13, 2013 edition...
23.5 Pipe Schedules Pipe schedules shall not be used, except in existing
systems and in new systems or extensions to existing systems described in
Chapter 11. Water supplies shall conform to 11.2.2.
If I can meet the water supply requirements of Table 11.2.2.1 for Ordinary
Hazard, which is a minimum pressure of 20 psi flowing 850 gpm then is the pipe
schedule permitted?
It appears as though I am out of luck because of 11.2.2.6.1 Residual
Pressure... The residual pressure requirement of Table 11.2.2.1 shall be met at
the elevation of the highest sprinkler.
The main reason I can't get the calc to work is because of elevation.
I would assume the AHJ would be willing to work with us if the choices are...
1. No upgrade to the sprinkler system, or 2. A fully sprinklered building with
2000 sq ft that is pipe schedule and doesn't work hydraulically.
Any insight or ideas will be appreciated.
Reed
Reed A. Roisum, SET | Karges-Faulconbridge, Inc. | Senior Fire Protection
Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 |
KFIengineers.com<http://www.kfiengineers.com>
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