Registered: 1359070732 Posts: 2,240
Reply with quote #1
This is generally stated as "five to seven times the outside diameter"
So for my 12 mm O/D tube (= 10 mm I/D), I ought to be getting 5 x 12 = 60 mm radius, = a 12-centimeter bend. (too big for my application) ======================== My supplier states, "84 mm minimum for 12 mm O/D tube - this sounds conservative... (= a 16-cm bend...) I experimented using poured into the PEX tube, and got the PEX very tight, but then it kinked some... green lentils I next experimented with a spare length of three-wire pushed into the PER, getting the tightest fit possible, then holding the PEX in a bowl of just-off-the boil electrical cord while flexing it. water Going very easy, I got the radius down so that the bend would "go around a Coke Can but with some slack". A Coke can looks like it is 72 -mm diameter. Therefore I reckon I get an 80 mm diameter. Which is over twice the recommendation... (For my application, I need 9 cms diameter) So I reckon I am on the lines for what I want... but just wondering if I am "stretching" the specs any ? All observations welcome G_H __________________
(1) "Heat goes from hot to cold, there is no directional bias" (2) It's wrote, "voilà" unless talking musical instruments...
Registered: 1353392169 Posts: 720
Reply with quote #2
Pex isn't the eaisest stuff to install. The very 1st loop I installed in my crawl space I kinked it in the first 20'.
I installed the pex myself but it would have been a lot faster & easier with 2 people. I didn't need that tight of a turn, but it's interesting that you managed it. As for the specs, I would say you are good unless you put a lot of pressure on the line. It may have a problem then. Jeff Central IL