Standpipe requirements for residential high-rise

[Inspector21]

I am attempting to perform a standpipe flow test on a residential high-rise that was built in 1963. It is located in Houston. Does anyone know what the required gpm and residual flow that is needed at the most remote hose connection? The local AHJ is saying that 25 psi residual is sufficient. But the required gpm is not known. The building currently has a 500 gpm fire pump. And the building was recently retro fitted with sprinklers in all common areas. A 4" standpipe was installed for the floor controls and was tied into the original standpipe in multiple locations.

 

[stookeyfpe]

In 1963 the largest attack hose line used (and with reservation) was a 2 1/2 diameter hose. I would speculate the volume is 250 GPM. I suspect my assumption is correct in that you have a 4-inch standpipe and the design was pipe schedule in that time period.

 

[Inspector21]

The building was not originally sprinklered. The 4" standpipe was installed in the last year. The original standpipe is 6" feeding a Class III standpipe system only.

 

[cdafd]

http://documents.publicworks.housto...4_code_adoption_history_for_houston_codes.pdf

I have heard different stories about Houston and if they followed codes during certain periods of time

 

[stookeyfpe]

Well I'm confused. Your orignal question is about the hydraulic demand for a standpipe. Now the building has two standpipes.

Houston is always tough to figure out buildings because I've found lots of structures built in Harris County under no codes that were annexed into the City of Houston. Plus, when one say's Houston, that can be in some smaller community adjacent to Houston. Good luck.

 

[cdafd]

also what are they going to do with 25psi??? hook up a garden hose?