Gpm Through 1 Inch Copper Tubing

kane co plumber

I was called out to a restaurant to give a quote on a softner, There service is 1 inch. Not even close to being able to handle there W.S.F.U. They really need a 2" service; 14 flush tanks, 18 sinks, commercial dishwasher, glass washer, and 2 urinals. In my proposal I wanted to quote them 2 diffrent ways 1st for 2" incase they ever brought in proper service size they wouldnt have to purchase a new softner, and 2nd the cheap way which is the way they will go. I was going to base the cheap way on how many gpm can flow through a 1" service @ 50 psi right off a 1 inch meter? Anyone got a clue

Leo G

http://flexpvc.com/WaterFlowBasedOnPipeSize.shtml

http://www.1728.com/flowrate.htm

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Paul B

Figuring 5 feet per second I come up with 12 gpm.

The pex thing says almost 60 but I don't know what high pressure means.

kane co plumber

I appreciate the effort but neither one of those sites answers the guestion of how many gpm @ 50 psi through 1" type k copper, if i had to quess it would be somewhere in between 45 and 60 gpm but I want to be dead on.

Leo G

You will never get an answer because you need to have a pressure drop in the calculation.

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kane co plumber

I dont need a pressure loss measurement, Picture this.... right off the city main u have your 1 inch supply then your b-box 1 inch copper gets sleeved throught the foundation wall of a basement at that point u have 50 psi, if u cut the pipe and turn on the b-box whats your gpm... there has to be a mathmatical formula, with out cutting a tee into line and clocking how fast i fill up a bucket, customer will not pay me to do that. Would be fun thogh

ChainsawCharlie

Try this formula:

kane co plumber

Nice... I was on the wrong forum, I should of posted in landscaping lmfao

ChainsawCharlie

does 762 gpm sound right?

ChainsawCharlie

I d/l'ed a trial version of Pipe Flow wizard here:

http://www.pipeflow.co.uk/public/downloadlinks.php

I used copper pipe, .5ft length, 50 psi. Trial version won't allow for change in pipe i.d. It's default setting is .984 inch. Fluid was water at 68 degrees f.

threaderman

I'm not going to do your homework for you ,but if you refer to APPENDIX E of the IPC (06) code book,you should be able figure every measurement you need,from flow/gpm,psi,to pressure loss,developed length and feet per second for various types of pipe.Hope this helps.Your likely between 17gpm - 27gpm where the water enters the bldg.

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bwalley

How long is the service, how many fittings, valves, etc.

Is it copper tubing or copper pipe?

There are many variables to figure, you as a plumber should be able to look this up in your code book.

Where are you located? that would be nice to know when trying to answer questions for you.

Leo G

How about just disconnect the service and fill up a bucket with a stop watch running. Then you would know without a doubt.

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plumber1a

Did you know that there is also a maximum velocity to consider, this is all calculated by many factors, length of run, pressure, pressure loss through various items (meters, softeners) pressure required at most remote fixture, pressure loss through piping/ fittings. If you follow the appendix's in most code books under water pipe sizing, make a plan of the system, know the answers to the questions you can figure your GPM at almost any point of the system. Your question of how much GPM through a 1" lacks all the above, maybe the landscaper has a simpler answers but how many sprinkler heads do you need? by the way who determined a 2" meter & service was needed.

kane co plumber

My code book only tells me allowable W.S.F.U. based on pipe diameter....My run from the main is aprox 30' with 1, 1" 90 and 1, 1" ball valve. Is there a simple multiplyer?

plumber1a

2001 California Plumbing Code Appendix A, Chart A-4 indicates about 32 GPM. A call to your water supplier could give you the GPM through their various sizes of meters as they also have the minimum and maximum pressure for the area.

protechplumbing

Simple. Add up your total GPM. Convert your GPM to FPS for that size and type of pipe. Get your developed lengths and account for any fittings with equivalent pipe lengths. Factor in diameter reduction and roughness increase with age if dealing with metallic pipe. Do hazen-williams calc. Add or subtract head losses/gains. Subtract pressure drop from minimum available static pressure at street. If you are not exceeding the speed limit for that type of pipe and the flow pressure is within minimums set forth by your code then you are good. If not, increase pipe size and run the numbers again.

Should you be selling jobs if you don't know how to size water distribution pipes?

BTW, this post was completely unnecessary as the carpenter has already told you everything you need to know about plumbing.

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wolf1728

Sorry for "bumping" a year-old thread but the address to the flow rate calculator is at http://www.1728.org/flowrate.htm

(The domain name 1728.com was recently stolen).

This is the third thread I've bumped so I think I'll stop right here.
Good website you have here. Lots of friendly and knowledgeable members.

mr.greenthumb

You should check their old water softener size. Some of them are sized too small which can restrict the flow . If sized properly, the pressure drop is about 15psi.

piercekiltoff

Disregarding friction issues, code books, etc. A rule of thumb - less than 15 GPM is probably do-able in 95% of circumstances from 1" pipe. Practically, with short runs, you can manage that in almost all cases. Sometimes you can get as much as 25, but you'd need more than 50#'s or very short runs.

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