Deep Seal P-Trap

[Golestan]

Hi,
Is there a standard for the depth of a P-trap?
Why is there a depp seal trop, is there a shallow trap also.

I am looking to find the depth of the SS line just after the floor drain. How can this be done? It depends on the geopetry of the P-trap, is that correct?

Please advice.

 

[dicksewerrat]

Are you really a Mech. Engr.?

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[Golestan]

Dear Mr. Cornelius,
I was hoping for an advice rather than a question!

 

[bimr]

It is typically a minimum 2" water seal, with a maximum of 8". You have to look in the plumbing code in the State where the project is to be constructed. Here is the Illinois Code:

f) Trap Seal. Each trap shall have a water seal of 2 inches except where a deeper seal is required to prevent the loss of the trap seal by evaporation. Where loss of the trap seal may occur due to evaporation, one of the following shall be used:

1) Vegetable oil may be added to the trap.

2) A deeper seal not to exceed 8 inches may be used.

3) An automatic trap primer may be used.

http://www.ilga.gov/commission/jcar/admincode/077/077008900D04100R.html

 

[dicksewerrat]

Just not a question that a graduate mech engr should ask.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[PEDARRIN2]

As a graduate engineer - not mechanical, though who deals with the plumbing trade, that is a question that most graduate engineers of any discipline would likely not know the answer coming out of college, unless they have done plumbing design.

So it is a fair question in my opinion.

Normal p traps maintain a 2" water seal and typically the code only allows 24" max above the water to the top of the drain.

But do look at the code. In Ohio, where the IPC is used, deep seal traps are no longer allowed to maintain trap seal. Use of vegetable oil is no longer allowed - although it probably goes on after construction is over. A trap primer is what we have to design - which usually gets disconnected and the maintenance people either pour water in the drain occasionally or use the vegetable oil.

 

[dicksewerrat]

I guess I would have looked under my sink.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[wannabeSE]

If I wanted to know the elevation of the sewer line, I would look at the elevation of the water surface in the trap and not concern myself with the depth.