Black Pipe Union on Boiler?

Old 09-12-16, 07:07 AM
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Black Pipe Union on Boiler?

I want to use a black pipe union like this on the return of my boiler. Is this a bad practice (because of leaking / high-temperature)? What does the sealing on these, an o-ring?

Old 09-12-16, 07:50 AM
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Assuming the piping is also iron, then yes you can use the union. There is no o-ring, it depends on precision machined flat surfaces mating to seal. So you want a high quality part; avoid the cheapies.

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