flow rate loss through 10 feet of 3/4" k copper

• Jul 6, 2010

• Thread starter
• #2

richterno1

Agricultural

Jul 6, 2010

5

forgot to add that i need to have a minimum operating psi of about 55 psi
and this is a water service line from the town supply

thanks for your help in advance

 

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• Jul 6, 2010

• #3

cvg

Civil/Environmental

Dec 16, 1999

6,868

use Hazen Williams equation to calculate the headloss. Add in a minor loss for the meter and any other fittings.

 

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• Jul 7, 2010

• Thread starter
• #4

richterno1

Agricultural

Jul 6, 2010

5

i don't know if i have all the information to complete that, any help would be appreciated.

thank you in advance

 

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• Jul 7, 2010

• #5

bimr

Civil/Environmental

Feb 25, 2003

9,369

The maximum velocity that is recommended for copper tubing is 8 ft/sec. If the velocity is higher than that, you will have increased pipe erosion.

http://www.copper.org/applications/plumbing/techcorner/designing_piping_systems.html

8 ft/sec will give you approximately 11 gpm with a headloss of around 6-7 psi.

 

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• Jul 7, 2010

• #6

cvg

Civil/Environmental

Dec 16, 1999

6,868

you may be able to get a maximum of 9 - 10 fps through the copper line which would give you maybe 13 gpm

 

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• Jul 7, 2010

• Thread starter
• #7

richterno1

Agricultural

Jul 6, 2010

5

i thought it would be much more, given its only traveling through 10 feet of pipe it would have very little friction loss.

 

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• Jul 7, 2010

• #8

bimr

Civil/Environmental

Feb 25, 2003

9,369

You would probably be able to get 35 gpm through the pipes with a headloss of approximately 62 psi. If you started with 85 psi, that would leave you with around 23 psi residual pressure. The velocity in the 3/4-inch line would be 25 ft/sec.

http://www.dsginc.biz/documents/maxflow_chart.pdf

http://www.dsginc.biz/documents/maxflow_chart.pdf

Not sure what is the practicality of this theoretical calculation.

If you exceed the recommended velocity of 8 ft/sec in the copper tubing, then the copper tubing will corrode away in a short time.

 

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• Jul 7, 2010

• Thread starter
• #9

richterno1

Agricultural

Jul 6, 2010

5

bimr,

thank you for your real work answer, i noticed on the sheets you provided that it has an actual 50 gpm rating but that's with an open flow and no resistance. i think i will design the system around 20 gpm and be on the safe side.

thanks for all the input guys.

 

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• Jul 8, 2010

• #10

bimr

Civil/Environmental

Feb 25, 2003

9,369

Not really sure what application that you have, but it must be noted that you will be operating well outside of the normal water velocity range of 3-8 ft/sec.

 

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