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I been doing some work on a steam system, it finally failed at end of season, now they called me to replace it.
The big problem besides not piped correctly is that it was using a lot of water but there was no physical leak. All the returns are visible to the eye. There are no puddle of water anywhere. It’s a rather long as in linnier feet of piping, no water on the ground anywhere, the three leaks that we did find did have water on the ground.
There are roughly 6 - 8 steam traps and one condensation pump.
Can I use a smoke test to try to find a leak?
Can I use air if I cap the vents?
What other alternative would you like to see done?