Originally Posted By: senomoto
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http://www.nachi.org/bbsystem/usrimages/P/PB250053.JPG ]
[ Image: http://www.nachi.org/bbsystem/usrimages/P/PB250052.JPG ]
http://www.nachi.org/bbsystem/usrimages/P/PB250053.JPG ]
[ Image: http://www.nachi.org/bbsystem/usrimages/P/PB250052.JPG ]
Originally Posted By: rmoore
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The sanitary Tee on the lower pipe would suggest it’s another drain feeding into the vertical drain. Maybe a dishwasher or laundry nearby?
BTW, you know that the left hand sink is "illegally" double-trapped?
--
Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: tallen
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Double trapped?? Is that bad?
So, you may not have 2 traps in line with one drain?
Originally Posted By: tallen
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Hmmmmmm, , I cant think of why this would cause a problem however, it does seem like overkill.
Originally Posted By: tallen
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Help me to understand Richard.
Originally Posted By: senomoto
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Yes it is double trapped and I did point that out. There is no plumbing in walls on that side of the house. i.e other bathrooms or laundry. I couldn’t figure why they would have that pipe ther (lower white pipe)
Originally Posted By: tallen
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So, a double p is like an s???
Originally Posted By: rmoore
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Hey Todd…
IRC 3201.6 .... Fixtures shall not be double trapped. ...
I wish I COULD explain why it's not allowed, but I really don't know the reasoning. Though I don't think it's the same problem as an "S" trap (ie: siphoning dry). Maybe one of the plumbing Gurus can help with an explanation.
Stephen, were there accomodations for a dishwasher? Maybe a drain got stubbed for future use? Maybe a plumber put it there just to confuse HIs? 
--
Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: cbuell
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double trapping is not allowed because the speed of the water draining is slowed down by the time it reaches the second trap so that the second trap doesn’t properly “self-clean”
Originally Posted By: rmoore
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Hey Charlie!
Yep...I just found this in the Carson Dunlop Home Reference Book...
Double Traps. Two traps are not permitted on any plumbing fixture. This arrangement may produce chronic blockages.
Having had "chronic blockages" myself in the past, I can tell you this is not a good thing! 
--
Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: jsieg
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The lower drain pipe looks like a drain for a dishwasher. Either it was there before the new kitchen cabinets were installed or it was put in as prep. for a future install of a dishwasher. If there is no dishwasher I hope it is cepped.
Originally Posted By: lkage
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| jsieg wrote: |
| The lower drain pipe looks like a drain for a dishwasher. Either it was there before the new kitchen cabinets were installed or it was put in as prep. for a future install of a dishwasher. If there is no dishwasher I hope it is cepped. |
If there are 2-15" drawer base cabinets ( or a 30" or 18" & 12") near to the right of the sink, pull the drawers out and look. I'd bet there is a capped drain there for a future dishwasher.
Originally Posted By: mthomas2
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BTW, can’t read the SN# on that one, but some of those InSinkErator IWHs are under recall:
http://www.cpsc.gov/cpscpub/prerel/prhtml02/02189.html