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Old 06-09-2010, 10:01 AM   #1
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Location of Traps?


What is a typical requierment for the location of a trap under a sink or laundry tub?
I find plenty of references to the maximum distance from the trap to the vent. It is obviously normal to see a trap directly under the sink - but does it have to be? Can it be a few feet away? As an example, on double sinks, one sink is often piped a couple of feet into the drain of the other sink.
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Old 06-09-2010, 10:49 AM   #2
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Location of Traps?


I'm not sure what state your in, but the MA plumbing code says you can only go up to 24" in total developed length (vertical and horizontal) from the fixture outlet to the trap. The IPC (international plumbing code) says you can go up to 24" vertical and 30" horizontal from the fixture outlet to the trap.

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Old 06-09-2010, 05:10 PM   #3
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I'm not sure what state your in, but the MA plumbing code says you can only go up to 24" in total developed length (vertical and horizontal) from the fixture outlet to the trap. The IPC (international plumbing code) says you can go up to 24" vertical and 30" horizontal from the fixture outlet to the trap.
UPC says only vertical from a fixture into a trap and max distance is 24"

Horizontal would create a running trap, and those are prohibited by another section in the UPC.

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Old 06-09-2010, 11:16 PM   #4
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UPC says only vertical from a fixture into a trap and max distance is 24"

I'm curious then Alan - if this is the case, then piping a double sink into a single trap is not to code?
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Old 06-10-2010, 07:16 AM   #5
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UPC says only vertical from a fixture into a trap and max distance is 24"

Horizontal would create a running trap, and those are prohibited by another section in the UPC.


That why people need to know what there state is using for their plumbing code, if its the IPC, UPC, BOCA, CMR, etc.... some states write their own code, some adopt national or international codes, some write admendments to national codes, and since each code and each state is slightly different, it important to know what state is using what code, what version and if there are any admentments.

Also, running horizontal before going through a trap is not a running trap, I see offset drains all the time, a direct 90 elbow off the fixture outlet, horizontal run for 12 or more inches, then 90 elbow to the vertical dumping into the P-trap is perfectly legal.
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Old 06-10-2010, 09:03 AM   #6
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I'm curious then Alan - if this is the case, then piping a double sink into a single trap is not to code?
Guy
There is an exception for that in there.

I believe even a 3 bowl, OR three lavatories set side by side not more than 15" center to center....... I'd have to look that part up.
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Old 06-10-2010, 10:16 PM   #7
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Location of Traps?


So to conclude this - I know the more "conventional" way to connect a washing machine standpipe is to have the trap under the laundry tub, and the standpipe connect above it. But is there anything wrong with doing it the other way around (see diagram attached)?
(By the way, this is in Ontario, Canada, in case you have any knowledge of those codes)
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Guy
Attached Files
File Type: pdf Plumbing-2.pdf (27.9 KB, 172 views)

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