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I need to run water approximately 1500' from the meter. I have been advised to set at least a 1" if not 1 1/2" meter to insure I have plenty pressure when the water gets to the house. That makes sense to me. The water company doesn't have anything larger than a 3/4" meter (which for whatever reason only emits 5/8"). I've been told twice that I can run a 1" line off a 3/4" meter with out any pressure loss. That doesn't make any sense to me. Can someone explain this to me please?

i would assume that you are only going to get as much pressure as the smallest constriction in the piping will allow. only so much water can come out of that 3/4 (or 5/8) outlet....the size of the pipe isnt going to affect that

It's about friction loss in the pipe. The short length of the meter doesn't cause a large pressure drop, but a long run of small pipe will. For example, at 3 gpm friction loss per hundred feet for 1" is .3 psi, for 1 1/2" it's only .03 psi. At 5 gpm its 0.76 psi and .1 psi.

So, at 3 gpm, friction loss over 1500' on a 1" is 4.5 psi and for 1 1/2" only about a half a pound. It's exponential so as flow in the pipe goes up, the head loss goes waaaay up.

mfalkner wrote:It's about friction loss in the pipe. The short length of the meter doesn't cause a large pressure drop, but a long run of small pipe will. For example, at 3 gpm friction loss per hundred feet for 1" is .3 psi, for 1 1/2" it's only .03 psi. At 5 gpm its 0.76 psi and .1 psi.

So, at 3 gpm, friction loss over 1500' on a 1" is 4.5 psi and for 1 1/2" only about a half a pound. It's exponential so as flow in the pipe goes up, the head loss goes waaaay up.

What he said................in this case length is your enemy!

mfalkner wrote:It's about friction loss in the pipe. The short length of the meter doesn't cause a large pressure drop, but a long run of small pipe will. For example, at 3 gpm friction loss per hundred feet for 1" is .3 psi, for 1 1/2" it's only .03 psi. At 5 gpm its 0.76 psi and .1 psi.

So, at 3 gpm, friction loss over 1500' on a 1" is 4.5 psi and for 1 1/2" only about a half a pound. It's exponential so as flow in the pipe goes up, the head loss goes waaaay up.

yeah thats what i meant to say!

So another words put down some 1.5" or 2" Pipe. Usually not a big price difference.

Length is everybody's enemy!

1in usually used at most house. U get better pressure if u run your waterhose lines before going inside the house.

Learn something new everyday!!!!!!!

i'd run 1 1/4 - 1 1/2 from the meter to the house. then go to 3/4 at the house. you'll have great pressure and volume too.

You ever hear of a turbo meter? I've used them in similar situations.

cbakerf81 wrote:1in usually used at most house. U get better pressure if u run your waterhose lines before going inside the house.

Not necessarily so. Around here 3/4" is by Far the most widely used size. I did put a 1" meter in for the sprinkler system though with a couple of waterhose outlets off of it.

mfalkner wrote:It's about friction loss in the pipe. The short length of the meter doesn't cause a large pressure drop, but a long run of small pipe will. For example, at 3 gpm friction loss per hundred feet for 1" is .3 psi, for 1 1/2" it's only .03 psi. At 5 gpm its 0.76 psi and .1 psi.

So, at 3 gpm, friction loss over 1500' on a 1" is 4.5 psi and for 1 1/2" only about a half a pound. It's exponential so as flow in the pipe goes up, the head loss goes waaaay up.

I sort of understand friction loss, and can see where it will be huge if I run 3/4" all the way to the house. But, if I understand what you're saying, there will be enough less friction loss in a 1" pipe to offset the pressure/volume issue of going from a 3/4" meter to a 1" pipe, and back to 3/4" pipe at the house. Right?

I just ran a line 1600 feet from the meter to the house. I used 1" pipe and necked it down to 3/4 once I got to the house. I've got plenty of pressure unless you run everything at the same time and then it drops.

timberjack wrote:I just ran a line 1600 feet from the meter to the house. I used 1" pipe and necked it down to 3/4 once I got to the house. I've got plenty of pressure unless you run everything at the same time and then it drops.

On a 3/4" meter?