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Old 12-30-2009, 01:32 PM   #1
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Default psi's relationship to pounds of force

I'm going to set up a test piece with a sweat cap on one end, and a Propress cap on the other, and see which end fails(maybe neither) in freezing conditions. I will post before and after pics...
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Old 12-30-2009, 02:53 PM   #2
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Before
psi's relationship to pounds of force-random-work-pics-184.jpg
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Old 12-30-2009, 05:32 PM   #3
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Experiment over..Propress cap pushed off. Sweat cap intact...

[ATTACH]4306[/ATTACH
psi's relationship to pounds of force-random-work-pics-185.jpg
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psi's relationship to pounds of force-random-work-pics-186.jpg  
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Old 12-30-2009, 05:40 PM   #4
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There has to be somethuing wrong, I've been told that Pro Press is the greatest thing to happen to plumbing since PVC.
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Old 12-30-2009, 05:48 PM   #5
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Quote:
Originally Posted by Killertoiletspider View Post
There has to be somethuing wrong, I've been told that Pro Press is the greatest thing to happen to plumbing since PVC.
Propress is nothing more than a sharkbite with a 3,000 tool you install it with.
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Old 12-30-2009, 10:04 PM   #6
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Quote:
Originally Posted by Airgap View Post
Experiment over..Propress cap pushed off. Sweat cap intact...

[ATTACH]4306[/ATTACH
Attachment 4305
Your test is flawed. The sweated cap was what 3/4" and the propress is 1/2"? Why not do both in 1/2" or both in 3/4".
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Old 12-30-2009, 10:35 PM   #7
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Quote:
Originally Posted by SewerRatz View Post
Your test is flawed. The sweated cap was what 3/4" and the propress is 1/2"? Why not do both in 1/2" or both in 3/4".
It wouldn't make any difference. pressure is pressure.
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Old 12-30-2009, 10:39 PM   #8
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Quote:
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It wouldn't make any difference. pressure is pressure.
Wrong. pressure is calculated in pounds per square inch. 3/4" has more surface area then 1/2"

But, the 3/4" also has more bonding area in the joint...

I'm too lazy to do the math.
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Old 12-30-2009, 10:43 PM   #9
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Wrong. pressure is calculated in pounds per square inch. 3/4" has more surface area then 1/2"

But, the 3/4" also has more bonding area in the joint...

I'm too lazy to do the math.
So your saying the 1/2" copper in my house has more psi than the 3/4" pipe even tho my gauge reads 75 psi at the hose faucet? Get your calculator out and explain that one to me.

Last edited by TheMaster; 12-30-2009 at 10:47 PM.. Reason: stated it backwards
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Old 12-30-2009, 10:52 PM   #10
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Why is the pressure rating for large pipe less than smaller pipe.....say a solder joint made with 95-5 on a 1/2" joint is 500psi at 100 degrees....ok now a 3" joint made with 95-5 is 300 psi at 100 degrees. 3/4 and 1/2" have the same pressure rating.
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