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Old 09-30-2016, 03:32 PM   #1
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PEX or Poly for Tank-to-House Water Pipe?


I'm running a new 100' water line (chlorinated - not drinking water) from a water tank to the house (it's rural - no mains). It's the SW desert, average low - 40F, and rarely hits freezing. There already exists a leaky 2.5" internal diameter PVC pipe burried in the ground, through which I plan to feed the new line. It's a small house and either the shower runs, a sink, or the toilet refills - so usually only one outlet at a time is running. I have a small pressure feed pump in place at the house end, with 3/4" connections, and the water pressure is fine. I was told 3/4" will do the job well enough. Is NSF poly pipe any good? Poly is much cheaper than Pex. I will of course need to fit threaded end terminals.

Anything else to consider?



Suggestions appreciated. Thanks.
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Old 09-30-2016, 03:50 PM   #2
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Re: PEX or Poly for Tank-to-House Water Pipe?


Black poly is fine for water line to a pump. It used here all the time with no issues as feeder water lines.
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Old 09-30-2016, 03:53 PM   #3
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Re: PEX or Poly for Tank-to-House Water Pipe?


Thanks!

Waste of money to go from 3/4" up to 1"?

What fittings should I look for?
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Old 09-30-2016, 09:36 PM   #4
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Re: PEX or Poly for Tank-to-House Water Pipe?


If you go with black poly, there are different ratings for pressure and I think temperature (up here anyway). If your currently have 2.5", using a smaller size may affect your available volume so larger would be better. Depends on your pump. There are fittings designed for poly, usually barb fittings and gear clamps.
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Old 09-30-2016, 09:47 PM   #5
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Re: PEX or Poly for Tank-to-House Water Pipe?


Thanks. Temperature here is not likely to be an issue. The 2.5" was put there by a previous owner and the line was gravity feed only. I have since installed the pump. I see Advanced Drainage Systems blue 1" x 100' potable poly, rated at 200psi, at HD for only $40 so at that price, may as well go for it. The black 3/4" is only four dollars less.
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