Originally Posted By: gbeaumont This post was automatically imported from our archived forum.
Hi to all,
that is sure odd Bob, but I don't see a problem per se with that set up as each bowl is in reality a seperate issue, I don't have IRC in front of me at this time but I'm sure they only limit the number of traps on a common waste to 3.
Originally Posted By: jpope This post was automatically imported from our archived forum.
vent system pipe size if I’m not mistaken. So long as traps are properly connected to the waste line, a 2 1/2" line can accommodate six fixtures (a 2" line accommodates only 3 fixtures).
Originally Posted By: jpope This post was automatically imported from our archived forum.
Not quite the same Paul. That reference is two traps in-line. Roberts picture had separate trap arms to the drain/vent.
The IRC allows two traps into a shared trap arm, however, the UPC prohibits this practice and all traps must enter the vent through individual trap arms.
-- Jeff Pope
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Originally Posted By: gbeaumont This post was automatically imported from our archived forum.
Each plumbing fixture shall be separately trapped by a water seal trap placed as close as possible to the fixture outlet. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches (610 mm). The distance of a clothes washer standpipe above a trap shall conform to Section P2706.2. Fixtures shall not be double trapped. Exceptions to the separate trapping requirements are as follows:
1. Fixtures that have integral traps.
2. A single trap shall be permitted to serve two or three like fixtures limited to kitchen sinks, laundry tubs and lavatories. Such fixtures shall be adjacent to each other and located in the same room with a continuous waste arrangement. The trap shall be installed at the center fixture where three such fixtures are installed. Common trapped fixture outlets shall not be more than 30 inches (762 mm) apart.
3. The connection of a laundry tray waste line is permitted to be made into a standpipe for the automatic clothes washer drain in accordance with Section P2706.2.1.
Originally Posted By: roconnor This post was automatically imported from our archived forum.
It looks like the trap on the left is for a sink with a garbage disposal (food grinder), so in my opinion those would not be the same fixtures types (“like fixtures”) that could share a common trap. Looks like they did it right to me with the separate traps.
Note that IRC P2717 also allows a dishwasher to be tied into a sink drain (with or without a garbage disposal) and share the same trap, as long as the dishwasher line has a "high loop".
Just my opinion and 2-nickels ... 
-- Robert O'Connor, PE
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