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Old 03-25-2009, 02:38 PM   #1
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Underground Supply line, 3/4" poly or type K


We have had problems with our residential well and are going to tap into the city supply instead. We have had a couple quotes for the hook-up.

Contractor A came in around $3,000 and he quoted running a 3/4" K copper supply line

Contractor B came in at about half of that and will be using 3/4" poly supply line

The total length of the run is about 70'

Is the copper worth the extra cheese?

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Old 03-25-2009, 03:28 PM   #2
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Underground Supply line, 3/4" poly or type K


Check with your local Code Office. I am a copper fan, but many areas do not specify what materials can be used. If your meter will be at or inside the house, this can also make a difference. In Ohio, all underground lines to the house were required to be 1" type K copper. In Florida, 3/4" PVC was approved, and the same where I am now, in Arkansas. In either case. make sure the backfill is not filled with rocks or other material that may pierce the lines.

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Old 03-25-2009, 05:15 PM   #3
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Underground Supply line, 3/4" poly or type K


Here's a previous thread I originated regarding the issue of copper vs. PEX, perhaps some of it will be germane to your issue:

Is copper still the "Gold Standard"?

Good luck with your project!

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Old 03-25-2009, 06:18 PM   #4
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Underground Supply line, 3/4" poly or type K


If cost is a concern .. Go with the pex. Make sure they don't install or back fill with any sharp or large rock...I like copper
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Old 03-25-2009, 06:28 PM   #5
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Underground Supply line, 3/4" poly or type K


I'm thinking that the pex you all are referring to is called Pro Core. Some juridictions allow and some don't or use PVC.
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Old 03-25-2009, 06:45 PM   #6
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Underground Supply line, 3/4" poly or type K


I'm a fan of PE pipe. It is IPS (iron pipe size) so the ID is actual 3/4 or 1" etc. unlike CTS (copper tubing size) where the OD is maintained and the ID varies due to the wall thickness based on the pressure rating.

PE pipe has been around since the early 1960s. Millions of people use it in their wells to 500' and underground to the building. Water companies have used it for service lines from the street. I've used it for 20 years.

It is inert meaning it adds nothing to the water, unlike copper which is dangerous to humans, nothing in water can harm it like copper can be like acidic water and bacteria and high DO, TDS and CO or electrical grounds or stray electrical currents caused pinhole leaks.

One person can handle a 500' roll easily and you simply unroll it into the trench as you walk along behind it along side the trench. It will roam from one side of the trench to the other and you do not need to worry about contraction/expansion problems as you do with PVC or copper. It has the least friction pressure loss and you only need a fitting on each end. If frozen it is the most forgiving of all materials.

It is common in rolls from 100, 200, 300, 500 and 1000' rolls. And is commonly found with ratings of 75, 125, 160 and 200 psi. For pressure lines I suggest 160 or 200 psi.

To use insert/barbed fittings, you warm teh end of the tubnig evenly and wait to tighten clamps until it cools and duble oppse clamp it with SS clamps if the fitting is underground, above ground one clamp is sufficient. All clamps should be tightened properly with a small T handle ratchet type hose clamp torque wrench sold where you buy the clamps or at an auto parts store.

So what's not to love?
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Old 03-25-2009, 07:15 PM   #7
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Underground Supply line, 3/4" poly or type K


Quote:
Originally Posted by Gary Slusser View Post
So what's not to love?

we are looking at the 200 psi poly, so i I feel the same way
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Old 03-25-2009, 10:59 PM   #8
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Underground Supply line, 3/4" poly or type K


do yourself a favor and put in 1" instead of 3/4. Lots more volume for future___! like underground sprinklers,fire protection,and general who knows what,like a pool in the future. AND only use BRASS ends not those plastic inserts,,they crack easy!! I prefer the PE as opposed to copper,but do what you have to. correct on using higher pressure pipe tho. compact the trench as well as you can,,,ground squirrels and gophers LIKE to follow loose dirt down and chomp on pipe.

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