I want to move the kitchen sink to the other side of the kitchen (approx. 10 feet away). Can I just extend the pipe and rely on the existing vent?
Plumbing – move a drain without moving the vent too
drainplumbingrelocating
Related Solutions
You must have a vent above the vertical run for these drains. As drawn, water from your new work cannot draw air behind it from your existing work.
This is what vents do: draw air in behind draining water.
You could functionally combine all the new work drains as drawn into a single vertical vent, but remember that it needs to be able to draw air from above their combined drain line.
Depending on your code you may or may not be able to combine these into a single vent, but they will need their own vent.
This is forbidden by the International Plumbing Code.
2009 IPC 906.2: "Venting of fixture drains. The total fall in a fixture drain due to pipe slope shall not exceed the diameter of the fixture drain, nor shall the vent connection to a fixture drain, except for water closets, be below the weir of the trap." (Emphasis added.)
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Best Answer
You don't provide much context to this question, but the short answer is there's a maximum distance between the trap and the vent (should be specified by your local code). If the vent is too far away, the sink won't drain well.
As you can see, for a 2" pipe (typical), you can only go 5' (but of course: check your local building codes for specifics). 10' is definitely too far.
Remember also you need to maintain a slope on the waste line (typically 1/4" per foot).
If you can run the vent line over to the new location as well, it may be acceptable. A picture/diagram of what you're doing would help provide a better answer.