Cast iron radiator feed and return testing

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Campion1

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Hello,
I am building a new bathroom in an extra bedroom I have. I needed to move my cast iron radiator from one wall to another. I first drained my boiler, I disconnected the radiator from the feed and return pipes, and then I tore up the floor. I then disconnected the old pipes and moved them to their new location. The nipples coming out of the floor have caps on them, so I can put the floor back down, and fill my boiler back up. I would like to leave the caps on the pipes so I can finish the renovation, drywall paint baseboard. Now here is my question before I put the floor back down I want to make sure I have no leaks below the floor. My boiler is filled back up with water but I am worried with the caps onthe pipes it might be air bound and there might actually be no water in the pipes. What would be a good way to test this? I don't want to have any leaks obviously in theroom below.
 

Leon82

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I would have ran a tube from one pipe to another.

Depending how its run the cap may prevent the water from circulating.
 

Leon82

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Your going to need to purge the air which will be impossible with those 2 vertical pipes capped.

Is your system run as a loop or does each radiator have its own set of pipes back to the boiler?
 

Campion1

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Your going to need to purge the air which will be impossible with those 2 vertical pipes capped.

Is your system run as a loop or does each radiator have its own set of pipes back to the boiler?
Each radiator has its own pipes. I'm thinking about, draining the boiler, and installing a piece of pex to cross the two pipes.
 

Leon82

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I did that for my remodel.

If you use a sharkbite type fitting when your ready to lay the tile you can drain a little water and pop it off, set the tile then slip the pipe back in

But on mine I left it below the floor. When I reconnected I ran the pipe thru the hole I made in the tile up to the baseboard
 

Campion1

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I did that for my remodel.

If you use a sharkbite type fitting when your ready to lay the tile you can drain a little water and pop it off, set the tile then slip the pipe back in

But on mine I left it below the floor. When I reconnected I ran the pipe thru the hole I made in the tile up to the baseboard
That's a good idea, although my pipes are steel.
 
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