Pressure loss in pipe

[jimtheengineer10]

I typically deal with structural engineering so I don't deal with this type of thing so I figured I would ask on here for help. I was asked if there would be enough pressure at a house.

2" poly pipe
100' elev drop from water main tap to house
1000' water line run

I remember a few things from my thermodynamics class but not enough to determine what pressure there would be at the house.

I am not sure what the pressure is at the main but I can find out if I need to.

Thanks for the help.

 

[msquared48]

Well, first off, it's not thermodynamics principles you need to use here, it's Hydraulics, particularly pressure flow in pipes.

You need to determine the head loss for the desired flow rate through the 2" line and see what head remains to generate that flow rate.

Mike McCann, PE, SE (WA)

 

[bimr]

Probably should ask the person that recommended the 2-Inch water line. The 2-Inch water line will likely supply adequate pressure for any situation. The 2-Inch water pipe can pass 60 gpm with approximately 30 psi pressure drop.

Many communities are now require a minimum of 1-Inch services for new construction. The typical residence uses approximately 350 gals per day of water (100 gals per person) with a peak hourly flow of 3-5 gals per minute.

The 100 ft elevation drop will add 62 psi to the incoming water supply.

To confirm, you need to know the required water flow. Put the information into a calculator to come up with the pressure drop.

http://irrigation.wsu.edu/Content/Calculators/General/Pipeline-Pressure-Loss.php

 

[dicksewerrat]

May need a pressure regulator new the building.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[cvg]

no, 100 foot drop will not add 62 psi check the math...

 

[bimr]

Right, 100 foot drop will add 43 psi. The 62 psi is an error. Thanks