when to use NPT and when to use sweat

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Old 02-24-14, 05:50 PM
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when to use NPT and when to use sweat

I need 2 sets of circulator isolator flanges. There are two different types: NPT and Sweat.

Usually when we should use NPT and when we should use solder?

Do you think this isolator flange from Taco is good? Taco SF-100S Brass Shut-Off Freedom Swivel-Flange Set - 1" Sweat. It seems different with others.
 
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Old 02-24-14, 05:58 PM
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Depends what you want to connect them to.
 
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Old 02-24-14, 06:20 PM
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In my case now, it is a circulator flange. It will be connected to regular 1" copper pipe.
 
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Old 02-24-14, 08:00 PM
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it is a circulator flange. It will be connected to regular 1" copper pipe.
I would use the sweat... one less 'leak path'.

Do you think this isolator flange from Taco is good?
That's what I used on my last install. So far so good... in service 2 years, no problem. I do like the swivel flanges... less hassle getting everything lined up.

When soldering any valve like that, good tip is to tightly wrap the valve with a wet rag. You're going to need a decent torch. 1" copper into a big hunk of brass is going to need QUICK heat. You want to get in and out as fast as possible. Too weak a torch and you end up heating and heating and heating... because the heat has more time to 'spread' to the valve body.

For this reason it is sometimes advisable to use a threaded adapter. You can 'make up' the adapter onto a length of pipe, then thread it into the valve, and then when you solder the other end of the length of pipe you are far away from the valve.
 
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