> For those using copper, what schedule pipe did you use? Just regular
> old copper water pipe from a big box store or something stronger?
> I'm probably showing my ignorance here but 175 lbs pressure seems
> pretty high to me.
Here is a lot good resource for copper tube info:
http://www.copper.org/resources/pub_list/pdf/copper_tube_handbook.pdf
3/4 Type "M" copper tube [the hard stuff, not the soft coil], which is the lower
priced stuff at the building center, is good for more then 640 psi or more at
temperatures below "the garage is on fire". Ratings go up as the size goes
down and as the fire department get things under control.
I have no rational explanation for my using Type "L" - the higher priced stuff
at the building center - other than the previously mentioned 'over engineering'
gene and the 1000 psi or better rating.
At least in Minnesota, the local building suppliers do not have Type "K"
on hand.
Note that copper tubing is 'outside diameter', therefore all of the fittings
will fit no matter which type of tubing you are using - L, M, K, etc.
The .pdf also has a good section on soldering, etc.
Arvid
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