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Near Boiler Piping Question
I'm in the process of repiping my Burnham gas fired steam boiler with double risers and drop header. I am well on the way to making this happen but had a question about the location of the close nipple for the Hartford Loop. Burnham states a location that is 2 inches below normal water line, which is where it currently is located. I am guessing that the 2" is from the top of the close nipple since that is when steam can start to back out of the boiler and flow over the Loop,. Is there any reason I can't increase the distance a bit and use 3" instead? I hope this doesn't sound like a stupid question but TLAOSH talks about the loop being above the crown sheet of the boiler. It seems to me that the current location is well above that but I didn't know if that was something I should be looking at.
Several times folks on here have indicated that the piping recommendations by the Mfg. are a mininimum for satisfactory operation. I wanted to know if this was the case here as well.
I am using two very tall 2" risers to a 2" drop header, separate lines for front and back of house and 2" equalizer.