> I capped off all the openings and used a pressure
> gauge on one pipe. To my surprise the pressure was about 75 psi! I
> turned on a nearby faucet and the pressure dropped to 30 psi.
> It turns
> out that the previous owner used 3/4" pipe to connect the
> house to the
> meter, a distance of 700'.
IMO, if the flow of a single faucet dropped the pressure by 45 psi, you have
something else going on besides 700' of 3/4" pipe. This chart says even 4.8
gpm (which is a big faucet) should only drop about 17.5 psi through 700' of
3/4" steel pipe.
http://www.engineeringtoolbox.com/pressure-loss-steel-pipes-d_307.html
Randall
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