Best pex for spray in trench foam?

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goosegunner

Minister of Fire
Oct 15, 2009
1,469
WI
Trying to finalize my permanent install of my under ground lines.

What is the best pex for pray foam in the trench method?

1-1/4" pex

1" aluma pex

2 sets of 1" pex

How about alumapex? I like the true 1" diameter and low expansion rate. How about durability to freezing?

I have discovered that I need and want to go bigger than 1" pex. It works fine for the house but need some extra capacity for the pool. I am getting a 50 degree delta T from my pool exchanger when the supply temp is 170 degrees.


gg
 
The cross sectional area of the ID of 1.25" PEX is almost equal to half of the cross sectional area of the ID of 1" PEX. So, dual runs of 1" would be roughly equal to a single run of 1.25". I will be doing dual runs of 1" PEX for my installation.
 
juddspaintballs said:
The cross sectional area of the ID of 1.25" PEX is almost equal to half of the cross sectional area of the ID of 1" PEX. So, dual runs of 1" would be roughly equal to a single run of 1.25". I will be doing dual runs of 1" PEX for my installation.
Click to expand...

If it is almost eqaul why the dual 1" not the 1-1/4"?

gg
 
The cross section area of two 1" PEX tubes might be about the same as one 1-1/4" PEX tube but they have more surface area than the single larger tube. Combined they still have a bit more resistance to flow; about 20% more according to my understanding of Siegenthaler's book and his tables for pipe resistance.
 
I used (please forgive spelling, too lazy to look up) Upon Wirsbo 1 1/4" hePEX. Company has long history. Intentionally avoided the Aluminum stuff for some reason I read here. Foggy but some bad or unnecessary impression left with me. I personally wouldn't use (4) 1" vs (2) 1 1/4" just for the headache factor. Certainly true regarding surface friction and more fittings/changes in water direction. Again, unless the savings are big... why. BTW what would the savings be?
 
It's cheaper to buy dual 1" O2 barrier and fittings are easier to find. Also, most crimp/clamp tools for PEX only go up to 1".

FWIW, I need about 125' of PEX in one direction. A 300' roll of 1.25" from PEXsupply.com is $700, and it's non-barrier. It is $420 for 600' (two 300' rolls) of 1" barrier PEX from PEXuniverse.com. I couldn't find 1.25" on PEXuniverse, but they are considerably cheaper than PEXsupply for PEX. Both have free shipping.
 
I used 1" pex and it runs 350 ft one way it feeds a enough heat to feed a coil in a 120,000 furnace and make domestic hot water. I ran four `1" lines as I have two furnaces in my house. Like every one has said 1" pex,fittings and tools are easier to find. That is the reason I used 1" pex.
 
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