psi's relationship to pounds of force - Plumbing Zone

**Airgap** · 12-30-2009, 01:32 PM

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...

**Airgap** · 12-30-2009, 02:53 PM

Before
Random work pics 184.jpg

**Airgap** · 12-30-2009, 05:32 PM

Experiment over..Propress cap pushed off. Sweat cap intact...

[ATTACH]4306[/ATTACH
Random work pics 185.jpg

user4 · 12-30-2009, 05:40 PM

There has to be somethuing wrong, I've been told that Pro Press is the greatest thing to happen to plumbing since PVC.

TheMaster · 12-30-2009, 05:48 PM

Quote:

Originally Posted by Killertoiletspider

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.

SewerRatz · 12-30-2009, 10:04 PM

Quote:

Originally Posted by Airgap

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".

TheMaster · 12-30-2009, 10:35 PM

Quote:

Originally Posted by SewerRatz

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.

**ILPlumber** · 12-30-2009, 10:39 PM

Quote:

Originally Posted by TheMaster

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.

TheMaster · 12-30-2009, 10:43 PM

Quote:

Originally Posted by ILPlumber

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.

TheMaster · 12-30-2009, 10:52 PM

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.

12-30-2009, 01:32 PM	#1
Airgap Moderator Join Date: Dec 2008 Posts: 4,905 My Photos	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... __________________ AG..Keepin' the good water from the bad water.... Wide is the path, narrow is the gate. But one day all will acknowledge, many to their everlasting sorrow. MOΛΩN ΛABÉ

12-30-2009, 02:53 PM	#2
Airgap Moderator Join Date: Dec 2008 Posts: 4,905 My Photos	Before Random work pics 184.jpg __________________ AG..Keepin' the good water from the bad water.... Wide is the path, narrow is the gate. But one day all will acknowledge, many to their everlasting sorrow. MOΛΩN ΛABÉ

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user4 Registered Member Join Date: Jun 2008 Posts: 3,806 My Photos	There has to be somethuing wrong, I've been told that Pro Press is the greatest thing to happen to plumbing since PVC.

12-30-2009, 10:52 PM	#10
TheMaster Registered Member Join Date: Jun 2009 Posts: 6,437 My Photos	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.