I have problem with standpipe trap. Unfortunately, sanitary tee the
standpipe is connected to is just 4" below the stand pipe top. My question
is can I lower the trap adding a section between the trap curve and 90
degrees elbow. Thus I could maintain proper standpipe height and drain it to
the main sewer.
| | |TRAP
Now, you want to lower the "U" part of the trap by adding
length to its left leg?
That will work OK. It will mean that there is more water
in the trap (deeper trap seal). The standpipe top will need
to remain above the trap outlet to the TEE.
As long as the top of the standpipe is above the TEE, it will work.
If this is for a washing machine, where there is a lot of water flow,
you want the standpipe to be as high as possible to prevent overflow.
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