gpm in pipes

Brendan_4

Ken That is a lot of pressure for a 22' water colum

Richard in San Francisco

gpm in pipes

how many gpm can a 1-1/4" cu pipe type L deliver with 50 psi

Ken_40

Alot!

I'm guessing (too lazy to do your homework);-o) it to be in the neighborhood of 50 GPM. That assumes there is no length to this tube, and no elevation of a few floors/feet - which has a huge impact on the number you seek.

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Glenn Sossin_2

distance - assuming L copper

It is a function of friction. If we start at 50psi, and 50 gpm, travel 100ft straight in 11/4L copper, there would be a 18.94 ft of head loss. This would mean you would have a pressure drop of approx 8 psi. So you would have your 50 gpm through the 100ft of L tubing but the pressure at the end would be approximately 42psi - not the 50 you started with. Its called pressure drop.

Hope that helps you. See attachment

Ken_40

Re-read the question.

He does not have 50 GPM's. He wants to know how many GPM's he could deliver @ 50# of pressure thru an 1-1/4" pipe.

Think of it this way Glenn, he has a very short piece of 1-1/4" 'L' tubing (providing virtually no friction loss) punched thru the wall of a dam. The hole and enclosed pipe is 21.7 feet below the resevoir's surface, which creates 50 p.s.i. static pressure.

How many gallons of water will shoot out of the stub a minute?

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Steve Ebels_3

In other words

The answer, as always, is....... It depends.

RJ_4

gpm

On a water service line it all begins with the size of your water meter. For example, an 1 1/4 line with a 1 inch meter will deliver 20gpm at 50 psi static pressure, figuring a line 75 feet long. Call A.O. Smith tech. line for sizing tables. 1-800-527-1953.

Glenn Sossin_2

Flow

I understood the question, but I didn't think he understood the factors, which is why included the friction loss table. The answer is 402 gpm according to a Fairbanks valve table I have. See attachment

Mike T., Swampeast MO

You said that right! If this is a city system, it's the meter size more than anything that limits flow. Connect a 1 1/4" entrance to a typical 5/8" residential water meter and you won't get much more flow than through the typical 3/4" entrance.

Glenn Sossin_2

That's why

I didn't post the real answer of 402 gallons based on the conditions Ken was menntioned. Hopefully, Richard realizes now, there is a lot more involved in answering his question.