raising a sink drain pipe

[CheekyMonkeyWrench]

i would like to raise the drain pipe for a new sink install (wall mount). is this possible considering the current routing?

thanks

[ToUtahNow]

i would like to raise the drain pipe for a new sink install (wall mount). is this possible considering the current routing?

thanks

You left out the part of the picture which shows the sanitary fitting. Anything is possible but if you are trying to raise the trap you will have to go all the way back to the sanitary fitting. Would a longer tail piece not work?

Mark

[CheekyMonkeyWrench]

You left out the part of the picture which shows the sanitary fitting. Anything is possible but if you are trying to raise the trap you will have to go all the way back to the sanitary fitting. Would a longer tail piece not work?

Mark

Mark,

i'll be installing a wall mount sink with a decorative p-trap, and was hoping not to have to install a longer tail piece, just because i was going for a sleek look (i know:))

if i do decide to resolve it back at the sanitary fitting, do you just use the slope formula to figure out the lengths of everything? and what should the slope be (per foot or however you determine it)?

pete

[PLUMBER RICK]

the maximum distance the trap arm/ dirty arm can be is 3'6'' from the san tee to the weir of the trap. the proper slope for the trap arm would be 1/4'' per foot.

i would cut out the old tee above and below and reattach at the correct level with no hub bands. this looks like a 1.5'' trap arm.

rick.

[wbrooks]

Guys, just for my own knowledge, why is it not advisable to just do the following...

[PLUMBER RICK]

wayne, very creative with the photo:D

when you raise just the trap arm, you create a siphon leg.

the sanitary tee is tapped at 1/4'' per foot. with this configuration, a trap can be 3'6'' away from the tee and still not create the siphon. with a 2'' line and trap it can be 5'. technically it's measured to the trap weir.

i've seen many attempts to do what you photo-shopped. there is even a trap made that has a very long drop to lower the trap which is much more common.

a tail piece from the drain can be a max. of 30''. it's more common to be too low, than too high.

prior to garbage disposals the waste was ruffed in approx. 18'' off the floor. with a disposal, the waste should be approx. 13'' from the floor.

hope i didn't confuse you more than i explained it:confused:

rick

[wbrooks]

Actually makes perfect sense, thanks for the explanation

[plumbdog10]

Guys, just for my own knowledge, why is it not advisable to just do the following...

From what knowledge?

[Bob D.]

Dog, I think Wayne was asking why it was not proper to do as he showed in his photo-shopped image, not that it was something he had done.

[FINER9998]

rick "technically it's measured to the trap weir." for informational purposes, what is a trap weir? i've never come across the word weir before. thanks.

[PLUMBER RICK]

rick "technically it's measured to the trap weir." for informational purposes, what is a trap weir? i've never come across the word weir before. thanks.

the trap weir is the upper level of the water line, inside of the trap.

rick.

[ToUtahNow]

the trap weir is the upper level of the water line, inside of the trap.

rick.

To add to what Rick said think of the area at the top of the dam spillway.