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Help identifying skimming tap
Hello all, newbie to the forum here... Trying to figure out how to skim this old Slant Fin Liberty boiler. I think I have enough to go on as to how skimming is done, but my question is about identifying the location of the skim tap. I believe it to be the tap behind the low water cut off, which currently in this picture has a pipe going downward and valve attached to it. ( not of my doing ) Is that correct?
If so, my next issue is, I have filled the boiler to above this tap and opened this valve just to see if it drains , but nothing at all comes out. I assume it’s maybe plugged with sediment for lack of any flushing... but I don’t know that yet. I guess my next step might be to remove this pipe and valve and see what’s up.
Can you guys point me in the right direction on skimming this?