# Thread: Standpipe GPM?

1. ## Standpipe GPM?

Can you get enough water into a type I standpipe to supply 2 2.5 inch hoses both flowing 325 gpm?

2. Yes. Calculating GPM is based on pipe or hose diameter and the pressure at which water is being force through these.

Basically GPM=29.7 x D˛ x √P. So, your formula would be 29.7 x 2.5˛ x √50

Even at 50 psi, an open butt 2˝" should flow almost 1300 gpm

3. Originally Posted by CrnkB8
Basically GPM=29.7 x D˛ x √P.
I usually do that math in my head.

4. Right. Just keep turning the red knob up until steam comes out the windows.

5. Read Nfpa 14 for the set up on a standpipe

If you are talking in a building I think it is 500 gpm out of one and 250 gpm out of all others

6. usually about 65 PSI. remember to keep in mind PRV's

7. Originally Posted by Iessthename
usually about 65 PSI. remember to keep in mind PRV's
Are you seriously the same guy that pm'ed me the following:

Originally Posted by Iessthename
You immature southern fool. way to represent the rest of us in the country who know how to keep our mouths shut. You make us look like a bunch of malcontent yokels.
Wow. When you get done with your tutor, send her my way.

To the original poster......yes.

8. Originally Posted by fire49
Read Nfpa 14 for the set up on a standpipe

If you are talking in a building I think it is 500 gpm out of one and 250 gpm out of all others
that is correct.... just did that in the hydraulics class last night. (500 gpm w/ 100 psi at the top discharge without fd supply, otherwise they are required to have a fire pump)

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