How far down (vertical distance) from the tub drain can the P-trap be?

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Tilopa

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I'm putting in the drain for the sink, tub/shower, and toilet for a new bathroom build. Right below the sink drain on one side there is an obstruction, a 2" electrical conduit and box. So, I dropped the p-trap lower, it is about 20" below the tub drain. See image. Only after I glued everything in did I think that maybe that was to much head distance for the water to actually stay in the trap. Will the water just be pushed out because of the extra force of gravity, or will it still stay in the trap?


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Breplum

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Nothing to worry about. Off the top of my head there might be some UPC code limit, but washing machine standpipes are max. 30".
 
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