Please critique this plumbing arrangement

[arky217]

This is my proposed arrangement for the plumbing of my retirement house.
The outside walls are finished; no plumbing will be within them.
Also, I don't want to go through the metal roof, hence the venting out the gable end.

Although I'm in an area not subject to code, I would appreciate a plumber's
evaluation to make sure that I'm not making any major mistakes.

Sink #1 is the kitchen sink; #2 is the bath sink.
Of course, the bath sink, commode and tub are in the same room;
they're shown like they are on the sketch just for clarity in how the piping is run.

One thing I'm not sure of is the drain for the kitchen sink.
I don't know if the 66" is too long for the 2" drain pipe from the trap to the wall.

The dark 2" line down from the kitchen sink is another way that I could run the drain
and eliminate the 66" horizonal run, but I'm not sure if that is too much drop
and might empty the trap when a sinkful of water is drained.

Thanks in advance for your comments,
Arky

 

[leonandlisa]

Your trap arm is too long on the kitchen sink, use your alternative dark vertical line, if you don't have a place for a vent use a Studor vent under the kitchen sink. The other change I would make is on the 2" vent and combination drain for the lav I would run in 3" to the lav drain and then 2" from there, when you do a combination you need to upsize that portion that is combined.

Hope that helps.

Leon

 

[stevemachine]

66" isn't too long. 2" is good for a trap arm at a maximum of 8 ft. At least where the code in my area is. 1/4" per ft grade and you shouldn't have an issue.

 

[stevemachine]

And definitely agree on upsizing the wet vent and vent from the lav to 3"