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Old 03-23-2013, 07:08 PM   #1
brant740
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Default has anyone used pex instead of silicone

Has anyone used Pex in their system before. Everything i have read has been copper or silicone tubing. Pex is more widely available, is used frequently with hot water heating and is rated for high temps, so why doesn't anyone use it in their systems?

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Old 03-23-2013, 07:26 PM   #2
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it's not as flexible as silicone, but not as rigid as copper either.

I've seen a few setups that use pex (and also some that have cpvc) but most typically people are going for flexible lines that get moved around during the brew day, or rigid setups with valves that control flow.

It doesn't work quite as well for those two options, but that doesn't mean you couldn't use it. Just have to watch the upper limit on temp and where you use it. (not sure if it would handle boiling temps)

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Old 03-23-2013, 07:28 PM   #3
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im not positive, but pex is only good for up to 170 or 180

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Old 03-23-2013, 07:32 PM   #4
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Pex is actually only rated to 200 degrees which isn't bad, but if transferring directly from boil to chiller you might exceed that.
I looked into this and decided to go with thermoplastic tubing. It's nice stuff, much more flexible then Pex.......FYI

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Old 03-23-2013, 08:43 PM   #5
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Quote:
Originally Posted by slippery View Post
Pex is actually only rated to 200 degrees which isn't bad, but if transferring directly from boil to chiller you might exceed that.
I looked into this and decided to go with thermoplastic tubing. It's nice stuff, much more flexible then Pex.......FYI
Where did you get the thermoplastic tubing?

I think the 200° rating is for when it is under high pressure (85-100psi). On hearth.com forums a user claimed that on an open system (low pressure) it would work at 300+. i have accidentally boiled the water in my outdoor wood boiler lines for several hours and had no problems.

1/2" pex is flexible enough for my needs but i wasnt sure if there was some reaction to wort that i needed to know about (like galvanized).
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Old 03-24-2013, 05:56 PM   #6
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I got the TP tubing from Northern Brewer. Com . I couldn't find anyone that stocked it locally. Its nice stuff and rated for food service. As far as the pex i got my info. From a family member that is a heating contractor. I found the temp rating on line and was worried about off flavors due to high heat transfers.....if you have to buy something either way, i would go with something rated for food service....good luck. Hope this helps

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Old 03-24-2013, 06:10 PM   #7
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http://www.nibco.com/PEX/PEX-Tubing/PEX-Potable-Water/NP60-Spools-PEX-Tubing-Red/

From Nibco the manufacturer of PEX

Pressure/temperature rating 160 psi at 73°F
Pressure/temperature rating 100 psi at 180°F
Pressure/temperature rating 80 psi at 200°F
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Old 03-27-2013, 05:09 PM   #8
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Quote:
Originally Posted by slippery View Post
I got the TP tubing from Northern Brewer. Com . I couldn't find anyone that stocked it locally. Its nice stuff and rated for food service. As far as the pex i got my info. From a family member that is a heating contractor. I found the temp rating on line and was worried about off flavors due to high heat transfers.....if you have to buy something either way, i would go with something rated for food service....good luck. Hope this helps
Thanks for sourcing the thermoplastic for me. It looks like good stuff.
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Old 03-27-2013, 05:12 PM   #9
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Quote:
Originally Posted by Yellowirenut View Post
http://www.nibco.com/PEX/PEX-Tubing/PEX-Potable-Water/NP60-Spools-PEX-Tubing-Red/

From Nibco the manufacturer of PEX

Pressure/temperature rating 160 psi at 73°F
Pressure/temperature rating 100 psi at 180°F
Pressure/temperature rating 80 psi at 200°F
NSF-pw
From this data it looks like 212 @ 15psi would work alright. I found another forum that said pex can melt at temps over 255 but as long as it is not under pressure we should be safe.
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