Could Bad Main Return Vents Cause Water Hammer?
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The pressure might have risen to a point that could cause water level problems.
did you skim it?
can we see the correct near boiler piping? It’s such a rare treat.NJ Steam Homeowner.
Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
See my sight glass boiler videos: https://bit.ly/3sZW1el1 -
The vent might not have opened back up after the pressure dropped and formed a vacuum. this could have cause flashing of the condensate because its at its saturation point already. flashing of the condensate and rapid contraction of the steam is one cause of water hammer.0
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pedmec said:The vent might not have opened back up after the pressure dropped and formed a vacuum. this could have cause flashing of the condensate because its at its saturation point already. flashing of the condensate and rapid contraction of the steam is one cause of water hammer.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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I'm going to assume that the near boiler piping is correct, but... is this single pipe steam? if so, one possible problem has to do with how the high level steam main extensions (often called dry returns, though they aren't) are connected at the boiler.
Can you clarify?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
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ethicalpaul said:The pressure might have risen to a point that could cause water level problems.
did you skim it?
can we see the correct near boiler piping? It’s such a rare treat.ethicalpaul said:The pressure might have risen to a point that could cause water level problems.
did you skim it?
can we see the correct near boiler piping? It’s such a rare treat.Jamie Hall said:I'm going to assume that the near boiler piping is correct, but... is this single pipe steam? if so, one possible problem has to do with how the high level steam main extensions (often called dry returns, though they aren't) are connected at the boiler. Can you clarify?0 -
Near boiler should be OK. That's something! I notice, however, an insulated pipe behind the boiler. What is that pipe?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Is the flue connector (smoke pipe from boiler to the chimney crock) properly sloped at least 1/4" per foot going up from boiler to chimney? It looks like the pitch is the wrong way... But it may just be the camera angleOtherwise, The near boiler steam piping looks good. Nice Work!
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Is it a single main with three vents on it, or are there multiple mains splitting off that one riser?
it seems kind of big to just have one riser, but it’s hard to tell from lookingNJ Steam Homeowner.
Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
See my sight glass boiler videos: https://bit.ly/3sZW1el0 -
Jamie Hall said:Near boiler should be OK. That's something! I notice, however, an insulated pipe behind the boiler. What is that pipe?0
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Dairon421 said:Jamie Hall said:Near boiler should be OK. That's something! I notice, however, an insulated pipe behind the boiler. What is that pipe?0
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So I expect that's the problem with the hammer. It is much too close to the water line. Either raise it at least 28 inches or drop it to the floor.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
i think the OP asked the question why changing the air vents stopped the system from banging?0
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So he did -- and my guess, and it's just a guess, is that changing the venting changed the internal pressures just enough so that that pipe is just barely solidly wet, which would make the difference.pedmec said:i think the OP asked the question why changing the air vents stopped the system from banging?
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1 -
Yeah I found the problem. The problem was my Hartford loop tee wasn't low enough Below the water line. I thought it was supposed to be 2" below but the boiler I'm installing said 6" below water line. What was happening was steam was pushing back to my return and causing water hammer because the tee wasn't low enough0
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6" below is odd but yeah it shouldn't hurt anything. Especially since the Hartford loop doesn't protect you to speak of anyway.
NJ Steam Homeowner.
Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
See my sight glass boiler videos: https://bit.ly/3sZW1el0
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