10 feet elevation causes a 4.33 PSI drop. Add to that any frictional losses due to the water flowing. If you are measuring 52 PSI at the house while you are not using significant water, the pressure at the meter is a lost less than 70 PSI, or the elevation change is a lot more than 10 ft.
Once the supply pipe is filled, as much water comes out of it at the house as goes into it at the meter for all practical purposes.
http://www.engineeringtoolbox.com/pe...oss-d_619.html may be of use to you.
Now how much pressure drop would be too much? Remember you are going to lose 4.33 PSI due to the rise. Losing another 10 PSI during max water use would seem to me to be not so bad. You would be using about 22 GPM at that point if I read that right.
Last edited by Reach4; 10-22-2013 at 06:06 PM.
I do recall Terry said 1 1/4". I'm taking all the risk and I want to be sure.I presume at this point, an doubts would be about whether you need something larger than 1-1/4. Terry said "With 300 feet, you would be better off using 1-1/4" Poly ". That's a good indication that 1-1/4 would be up to the job.
In summary, a 1 1/4" pipe would mitigate the pressure drop due to a 10' elevation gain and 300' of friction better than a 1" pipe considering 52 PSI from the meter? I looked at the engineeringtoolbox link, but I don't know how to use the charts. Thanks for sending it.http://www.engineeringtoolbox.com/pe...oss-d_619.html may be of use to you.
Now how much pressure drop would be too much? Remember you are going to lose 4.33 PSI due to the rise. Losing another 10 PSI during max water use would seem to me to be not so bad. So if your water pressure dropped to 35 PSI, that would not be ideal, but not terrible in my opinion. You would be using a lot of water at that point.
Also, I'm not considering 1 1/2".
Last edited by AlexS; 10-22-2013 at 06:17 PM.
It looks like 1-1/4" CTS has a 1.05" Inside diameter.
So the chart below for 300 feet, more closely would be for the 3/4" meter, and 1" pipe.
In the 70's I run 350 feet with 1" poly and was a bit stunned to see how little water came out the end.
I was used to hooking for water services between 40 and 80 feet, where the water would just shoot out the end of the pipe like a fire hose.
The 350 foot line was running at 72 PSI and there wasn't much there at the end. Friction does take it's toll.
That's the last time I ever even considered using 1" for that distance.
The house next door, years later when that was replaced, we went with 1.5" PVC.
Last edited by Terry; 10-28-2013 at 10:54 AM.
Thank you all. Trenching was the hardest part, not calculating proper pipe size as I said earlier.