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Unregistered
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Posts:2321
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| 11/14/2005 8:50 AM |
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Thanks for the feedback and welcome MrFlexiblePex.
You mentioned the ProPex having a different fitting size than others. Is it not rated according to F 876/877 guidelines? If it does vary how much are we talking about and how much variation can we see with the fitting sizes across the board if they all comply with the standards?
OIA aka Dan
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MrPEX
Registered Users
Posts:5
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| 11/19/2005 3:58 PM |
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Hi Dan,
I did not refer to tolerances when I excluded ProPEX from the compatibility between various fittings and tubings. I referred to that this fitting is not very compatible with Silane and Radiation crosslinked Tubing. Crosslinking made in cold state.
The "shrink-back memory effect" is much less for those processes.
Best regards,
Mr PEX
MrPEX - The FLEXIBLE PEX-a Tubing |
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Unregistered
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Posts:2321
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| 11/21/2005 7:23 AM |
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okay. Riddle me this Batman, I've heard about companies not providing a warranty if you don't use their fittings with their product. Okay, well understood. Once again, since all tubing that has an ASTM/ANSI stamp follows their tolerancing, then wouldn't the crimp fittings from each manufacturer follow those same tolerance guidelines and so a fitting from mfr A be compatible with mfr B's? If the answer is 'no', then that would mean some crimp fittings are not well designed to match the proper tolerances of the pex? Chicken meets the egg?
Thanks
Dan OIA
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MrPEX
Registered Users
Posts:5
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| 11/21/2005 7:51 PM |
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If the warranty issue is a fault in the tubing, what has the fitting to do with it? I believe a manufacturer can not dishonor the warranty because of the fitting used - unrelated to the fault.
If a leak is located in the fitting, there could be a problem with warranty issues, if crossbrand products are used. However claims related to a fitting leak is normally very minor. (I hope you all are staying away from auto-fill systems in closed loop heating systems, right?)
Yes. The tolerances are quite tight in that PEX standard. So the fitting tolerances are very close, too. And should normally allow for compatibility. However, I am not saying that the tolerance bands utilized by different manufacturers are identical. A certain manufacturer may select to be towards the bigger side and another toward the smaller side in the tolerance band. Maybe because of a request from the Tubing Manufacturer. So it can be, that a brand fitting can make a better fit to the actual brand pipe, than to another tube. But we are really talking about very small differences.
In my experiences working with, or at, many different manufacturing plants development departments, the compatibility issues are the same for all manufacturers. Differences in Tubing tolerances between different production lots make the fittings fit good or worse. Those differences can certainly be as big as differnces between two Tubing makes.
Does above rumbling answer it?
MrPEX - The FLEXIBLE PEX-a Tubing |
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Unregistered
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Posts:2321
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| 11/22/2005 2:49 PM |
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Closed loop, yes. Auto fill? No. For what reasoning would a system need an autofill? A small leak? That's not good.
As far as the fittings go, you explained that which I already assumed. We are talking about very small tolerancing (I don't know the numbers exactly across the board). I guess what it boils down to is if they are on the upper half of the tolerance or the bottom half for the two extremes. If you have a crimp ring on the upper half with tubing on the lower half what problems, if any, can you expect to see? Does a tighter crimp mean a better seal? Not always. ARe we splitting hairs between them or we really talking about a greater, REALISTIC, chance of a leak. If you took fittings and pex from opposite tolerance ends and make a good crimp (done properly) would you not be suprised to see a leak?
Thanks
D
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Unregistered
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Posts:2321
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| 02/02/2006 6:49 PM |
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greetings, i have been researching pex brand/type versus price for awhile now for my own project and i still cannot reach a verdict. i need about 3000 feet of pex so cost is considerate. i can get the durapex brand at a local store for only $.19 per foot which is really tempting. what bothered me was how the stuff is packaged. it is just coiled up and taped together in a couple places. i dug through about 14 spools at the store, and every spool had small nick, cut, scrapes, et cetera.....no protection from shipping, being tossed around by loaders, unloaders, store clerks sliding the spools around and on rough shelves et cetera. also there is no protection from ultra violet light. wirsbo and others come in cardboard boxes. i took a section of good durapex and bent it with my hands. it just kinked. i took another section of durapex with a small nick in it. not through but more like a scratch. when i bent that piece, the nick started to expaned, then turn white, then fully split open almost all the way around, only being connected by a tiny thread opposite the nick. one easy twist of my hands and i now had two pieces of pex. ctvox
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