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 Crown Venting
Author: SwimRunPlumb (MI)

Why are crown vented traps illegal? Just reading through my code book and was curious.

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 Re: Crown Venting
Author: Timsplumbing (MA)

Because in essence they make a S trap.

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 Re: Crown Venting
Author: LemonPlumber (FL)

any bottom fouling of more than 1/3 of the diameter of the front side makes then useless.as water weigh siphons the seal dry.



Edited 1 times.

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 My Predecessors Said...
Author: Plumbum (Canada)

Too close to the stack and/or vent

Wind

Oscillation and evaporation

No Crown stuff?

Plumbum

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 Re: My Predecessors Said...
Author: packy (MA)

i thought that too.
vent too close to the water seal hastens evaporation.

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 Re: Crown Venting
Author: PBwrencher (WI)

Sorry guys you are all wrong!smiling smiley

A "Crown Vent" is a vent that is located within 2 pipe diameters of the trap it is serving.

When a vent is that close it is more subjected to fouling of hair, soap oils, grease, and other debris because; the flow of water does not have a chance to dissipate thus reaching the top of the pipe where the vent is during discharge causing premature failure.

How many guys remember the teaching of hydraulic jump?smiling smiley Not tobe confused it with hydraulic surge.thinking



Edited 1 times.

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 Re: Crown Venting
Author: hj (AZ)

Hmmm! Five answers and it took the fifth one to come up with the correct answer.

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 Re: Crown Venting
Author: jimmy-o (CA)

I vote we discuss the suject over some Crown Royal.

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 Re: Crown Venting
Author: joint-runner (MA)

Thank u PBwrencher for that...We are always Learning...

Don't be afraid to ask a stupid question and be a fool for a few minutes..


It's better than not asking that question and being a fool for life!!!



Edited 1 times.

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 Re: Crown Venting
Author: RWP (SD)

Many years ago I saw S traps with a vent off of the top of the trap. That is a crown vent I take it? I am not at all familiar with this subject.

- - - - - - - - - -

Retired after 50 years of plumbing and heating.

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 Re: Crown Venting
Author: LemonPlumber (FL)

where the trap and vent are of equal size!where the vent is larger?

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 Re: Crown Venting
Author: SwimRunPlumb (MI)

Yes RWP, that is what I was referring to. This is only because I read the term, and then did a Google search to see what it looked like.

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 Re: Crown Venting
Author: hj (AZ)

They were much more common when lead traps were used, but there were a few tubular ones made.

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