Another DW drain

[kurt]

What about this method?

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[Tom Raymond]

It's got a trap and a high loop. It's wrong but will work just fine.

I'd call it out, so the next guy doesn't call me a putz.

[kurt]

That's what I thought. What's wrong with it, though? I couldn't come up with anything specific.

[Erby]

Nothing. It's just unusual.

[kurt]

So, no one has a good reason why this is wrong? Anyone? Bueller?

[John Kogel]

The DW floods the sink trap and being elevated a bit it pushes water up the sink drain. Maybe.

It looks good to me. I would call it unconventional and move on.

[Jim Katen]

The sanitary tee on its back is wrong.

[Jim Baird]

The tee, and hard to judge elevation but it does look like the DW discharge might well flood the sink basket too.

[patt]

UPC only allows one trap per trap arm.

[Tom Raymond]

There are 2 fittings designed to connect the dishwasher drain to the trap, neither of which appear in that get up.

[kurt]

I thought about the trap arm thing. Didn't think about the tee on its back.

How bad is bad here? Both seem relatively benign.

[kurt]

There are 2 fittings designed to connect the dishwasher drain to the trap, neither of which appear in that get up.

Yeah, but does that really matter?

[Tom Raymond]

If the dishwasher goes unused for an extended period its trap could go dry. It won't smell very good when the door gets opened.

A la Katen, unconventional things tend to behave unconventionally.

[kurt]

It's in a building I bought. It works fine. When I saw it, I was actually kind of impressed.

One thing for certain....I'm not changing it. It's the "old building high sink drain exit" thing; can't fix it without opening up the entire wall and rebuilding the DWV system.