1-3/4” versus 2-1/2” for Standpipe Operations (Ep #59)

In this episode Dave McGrail goes into detail of what NFPA 14 (Standard for the Installation of Standpipe and Hose Systems) pre-93 and post-93 means in regard to expected outlet pressures and how those pressures can affect target fire flows comparing 1-3/4” and 2-1/2” hose.
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[@CapedChronicles]

Great instructional video and explanation! Those two firefighters are just having a blast in the background, watering the trees. :)

[@KosukiFire]

Look into a stream shaper. Will greatly increase your range, penetration and air induced into the fire.

[@solidstream13]

KosukiFire stream shapers are great when you need that extra range such as defensive operations and staying out of a collapse zone. However on the interior the extra range is not needed especially in the confines of a residential building. Be aware that use of a stream shaper negates one of the benefits of the smoothbore since they cannot pass larger pieces of debris often found in standpipe systems. A clogged nozzle can be devastating to the nozzle team.

[@wheelslip]

What about using two 2" lines with 1-1/16 tip and a Y at the standpipe? At 100psi at the pipe and 200ft would that not give you about 245gpm at the nozzle? Plus gain a backup line in the event you need to rescue your attack crew?

[@jonathancook5419]

What NFPA determines the minimum gpms we are shooting for in a residential or high rise. Or what formula was used to get that ie. Iowa etc etc.

[@bomedlin6380]

If 15/16 is 185 GPM at 50 PSI then why is the GPM lower at a higher PSI?

[@chrisclark1707]

Bo Medlin because it’s accounting for 100psi at the outlet not the tip of the nozzle. The 100psi is before accounting for the friction loss in the hose.