DIYbanter - View Single Post

wrote:
zxcvbob wrote:

You already have your answer -- 100 vertical feet from the cabin will
give you 43 PSI static pressure. The pipe size is determined first by
your maximum expected draw rate and then by the length. The more
gallons per minutes you want, the larger the pipe to avoid too much
pressure drop. (sorry, I don't recall the flow rates for different size
pipes) Don't forget that there's a 1.25" pipe size.

Thank you. Unless I can think of any reason other than cost to not
suggest the ranch owners buy 1.5 polyethylene hose, that is what I'll
suggest: it is the same size and material currently used elsewhere on
the ranch.

As for pressure drops, I'll ask the ranch owners what shower head flow
rate they plan on installing. Seems to me they could run five gallons a
minute and still suffer no pressure drop.

Bob

Yeah you are right about almost no pressure drop because it will be
very small (about 1psi) for 5 gal/min over 1000' or pipe. You could
drop the size to 1 1/4 and not notice the difference. 1 1/2" pipe
would give you more capacity (in case someone want to have a shower,
run a washing machine and flush the toilet simultaneously).