[woodypecker]

I've got a question. is there a maximum height that the discharge pipe can be in relation to the p trap? Thanks

 

[Ghostmaker]

Do you mean the inlet side of the trap?

 

[TheEplumber]

Define discharge pipe. Are you asking the depth of the trap seal? The max length of the tailpiece? The elevation of the trap arm?

 

[Chris616]

I’ll guess that you mean the maximum trap seal depth. I had to investigate this recently as I struggled to make use of an existing drain connection with a new farmers sink where the drain is much lower. This is the code for BC.

Chris

 

[woodypecker]

Sorry, you'll have to excuse me, I'm not a plumber. I guess I'm referring to the "trap arm" that goes into the wall. if it's too far up in relation to the p trap, will it cause the drain to flow slower since it has to work against gravity. Oh, happy v-day to all you veterans. Thanks

 

[Chris616]

Here's a explantion of the rationale behind the minimum and maximum depth of the trap seal.

Chris

https://www.jlconline.com/how-to/plumbing/deep-traps_o

 

[Ghostmaker]

If you trap connection to the wall is going up hill it will be prone to plugging. You really should open the wall and fix that.

 

[woodypecker]

Here's a explantion of the rationale behind the minimum and maximum depth of the trap seal.

Chris

https://www.jlconline.com/how-to/plumbing/deep-traps_o

thanks for the response. this answered my question.