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Old 02-14-2016, 02:31 PM   #16
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whats the total weight of the propane canister?
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Old 02-14-2016, 02:36 PM   #17
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whats the total weight of the propane canister?
Total weight is 37 pounds. I weighed before I hung it.

BTW I am not trying to justify using the compression valves. The supply house will have the Sharkbite valves in this week and I am going to use those.
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Old 02-14-2016, 02:44 PM   #18
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Total weight is 37 pounds. I weighed before I hung it.

BTW I am not trying to justify using the compression valves. The supply house will have the Sharkbite valves in this week and I am going to use those.
not a problem, im curious what the outcome will be, heres a question, average water pressure is around 60 lbs, so the weight on the valve should be about the same, if figuring is correct, then you have to add the shock load on, every time you open and close the water its banging into that valve..does that make sense?
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Old 02-14-2016, 03:18 PM   #19
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not a problem, im curious what the outcome will be, heres a question, average water pressure is around 60 lbs, so the weight on the valve should be about the same, if figuring is correct, then you have to add the shock load on, every time you open and close the water its banging into that valve..does that make sense?
Doing a little math; the ID of 1/2' PEX is .485 inches
Using Area = Pi times radius squared = approx. 0.2 square inches

At 37 pounds for the propane tank, I applying a force of about 185 PSI to the valve.

60 psi water pressure applied to the same 0.2 sq in would only apply 12 PIS to the valve.
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Old 02-14-2016, 03:32 PM   #20
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Quote:
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Doing a little math; the ID of 1/2' PEX is .485 inches
Using Area = Pi times radius squared = approx. 0.2 square inches

At 37 pounds for the propane tank, I applying a force of about 185 PSI to the valve.

60 psi water pressure applied to the same 0.2 sq in would only apply 12 PIS to the valve.
but wouldnt it be fluid mechanics to figure that out? since dealing with properties of water, not a dead weight situation? something in there about hydraulic effect on pipe or tubing...? that stuff makes my head hurt thinking about it..lol
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Old 02-14-2016, 07:33 PM   #21
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Found this in the Brass Craft installation instructions for compression stops on PEX tubing:

PEX COMPRESSION INLET

Note: On 3/8 OD and smaller, use plastic compression sleeve. On larger than 3/8 OD, use brass compression sleeve w/stainless steel tube insert.
1. Place compression nut and sleeve
onto the PEX tube.
2. If larger than 3/8 OD, insert
stainless steel tube insert.
3. A drop of general purpose oil will
make tightening easier.
4. If using a drop of oil or thread sealant
be sure the threads are clean of any
debris and that sealant is also free
of any metal debris.
DO NOT USE a putty, gasket material
or thread seal tape.
5. If using a thread sealant, apply a thin even coat to the male compression threads
only taking care not to get thread sealant on the compression ring or sealing
surface. Warning: Excessive thread sealant may cause joint to fail.
6. Hand tighten the compression nut onto the stop as far as it will allow.
7. Using hand tools, tighten 3/4 turn from the hand tight position. Note: Make sure that
the stop remains seated and square to the PEX tube. If the stop is not square to
the PEX tube, this could affect the ability to get a good connection.
8. For riser tube installation, see that section.
Tools Needed for Installation: Wrench Tube Cutter

So, brass ferrule and metal tube insert.

If I had installed them, I would have screwed up. I have plastic ferrules and plastic tube inserts.
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Old 02-14-2016, 09:38 PM   #22
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I guess they need the brass ferrals to dig into the pex...
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Old 02-15-2016, 07:38 AM   #23
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Results of the overnight test:

Temperature went down to 28 last night, tank still hanging. I hit the fitting with my heat gun ( a lot hotter than a hair dryer). After about 5 minutes the PEX started to deform and stretch. But the connection gave no sign of letting loose. Hot water could never get hot enough to do this to the pipe.

Based on my tests, I think a compression fitting on PEX would hold up fine. And I did not follow the manufacturers instruction. I did not use a tube insert and I used a plastic ferrule.


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Old 02-15-2016, 07:53 AM   #24
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cool, now if you take the weight off the pex and heat again it should shrink back to its original size...did you heat the valve or just the pex?
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Old 02-15-2016, 08:42 AM   #25
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cool, now if you take the weight off the pex and heat again it should shrink back to its original size...did you heat the valve or just the pex?
I applied the heat equally to the pipe and the valve compression nut.

I let it hang for another hour to cool down and took the tank down.

I disassembled the compression connection and this is what it looks like. The pipe in the valve and the plastic ferrule were not deformed. I assume the metal valve heat sinked away enough heat to keep the plastic in the valve stable.

The more I use PEX the more I am impressed by how idiot proof it is.

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Old 02-15-2016, 11:21 AM   #26
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Is it just me? I can't see your images.... I just get a small grey circle with a line through it
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Old 02-15-2016, 12:49 PM   #27
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Is it just me? I can't see your images.... I just get a small grey circle with a line through it
Not sure but I think it is a browser issue. If I view on my computer with Firefox browser I see them fine. If I try to use Chrome I get what you are seeing. Try another browser if you can.

Try these:










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Last edited by rjniles; 02-15-2016 at 01:03 PM.
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Old 02-15-2016, 01:24 PM   #28
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Much better, thank you.
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Old 02-15-2016, 01:26 PM   #29
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I want to thank you, rjniles, for conducting that trial. I have some of those in a bathroom and you put my mind at ease.
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Old 02-15-2016, 01:52 PM   #30
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I use for ice maker lines the plastic tubing with brass inserts and plastic ferrels, im thinking the pex is much harder and the plastic wouldnt did into the pex like the sharkbit fittings, If I used the compression fittings on the pex, I would first test with a stainless insert with brass ferrel...I know yours held together the way you did it...I usually make copper stub outs from the pex to outside the wall and use compression valves...
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