Hey Guys:

This question is concerning the vertical drain that the washer waster water hose is attached to.
UPC states that this length of drain pipe has to be between 18-42" in length before you connect it to a trap.
Is this length developed length or pure vertical length? I ask because based on the location I'm placing mine I have to go around an obstruction. So the question is does this length of pipe have to be completely straight before it connects to the trap?

Thanks,
Amado

Yes the length must be the total of all verticle pipe. If your pipe drops 12" then bends righthorixontally for 6" then drops again for 12" more your sum total is 24" not 30"

Since the object is to keep water from backing up as it drains at high volume, I imagine it's OK to use non-90 degree angles. I would never use 18" total height however; 30 or more. All you need is some lint holding up the works and swoosh, all over the place.

I was thinking of long sweep 90's to move around the obstruction, then it will turn completely vertical for about 30" before hitting the trap..

Sweeps are fine but you can only count on the true verticle sections. Are you certain UPC said 18" would be enough, we always shoot for 36" or higher, sometimes with a sealed connection. New washer drain fast and a 2" pipe is needed

Hi guys:

Let me just say that standpipes as short as 18" out of a PTRAP are OK as is 1.5" piping... believe me as we have it all over our state this way!

That being said however, I also agree that 2" is a better plan as well as the 30" minimum standpipe... it's what I do myself when I can! I just don't want people thinking 1.5" is a bad thing. Here, as long as the 1.5" drain pipes are clear/open there should be no issues. If there is an issue the 1.5" drain needs to be cleaned/augered, OK?

Finally, Amadagon, the 18" to 42" is the standpipe that the washer hose connects to BEFORE going into the trap....then the piping can run for no more than 5 feet until it must connect to the vent...and after that can go just about anywhere as long as you install cleanouts for every major change of direction. The waste pipe cannot jump up once it passes the vent, but can only pitch at 1/4" per foot for like I said, a maximum 5 feet, so the PTRAP keeps it waste to vent ratio within standards. If you jump up or run the pipe further it negates the vent.

See some diagrams/pictures below and let us know if you have questions, OK? I have included pics. Of individual vents and pics. With mechanical vents (AAVs). Hopefully this won't lead to confusing you, but check out the relationship of the drain to vent.

Mark

In checking the code it appears I have been out of code for about 45 years, my bad.

"804.1

All plumbing fixtures or other receptors

receiving the discharge of indirect waste pipes shall be
approved for the use proposed and shall be of such
shape and capacity as to prevent splashing or flooding
and shall be located where they are readily accessible
for inspection and cleaning. No standpipe receptor for
any clothes washer shall extend more than thirty (30)
inches (762 mm), nor less than eighteen (18) inches
(457 mm) above its trap. No trap for any clothes
washer standpipe receptor shall be installed below the
floor, but shall be roughed in not less than six (6)
inches (152 mm) and not more than eighteen (18)
inches (457 mm) above the floor. No indirect waste
receptor shall be installed in any toilet room, closet,
cupboard, or storeroom, nor in any other portion of a
building not in general use by the occupants thereof;
except standpipes for clothes washers may be
installed in toilet and bathroom areas when the
clothes washer is installed in the same room."