IAPMO does UPC? Max washer standpipe length?

[Reach4]

What is going on here? IAPMO does UPC, right? A Max standpipe for a washer is 30 inches with UPC?
And what about laundry sinks sharing the trap with a laundry standpipe? B

Snipped from "2015 National Standard Plumbing Code -- Illustrated"

 

[Kreemoweet]

So what may be your question? Yes, IAPMO does both codes. Yes, they differ. Other plumbing codes
have yet different specs for washer standpipe height, and other things. That's just how it is, with all types of building codes.

 

[Sponsor]

 

[Reach4]

So what may be your question? Yes, IAPMO does both codes.

That explains the A. I did not know they were different codes. I was thinking it was maybe an alternate name for UPC. From your info, I found this: https://codewatcher.us/codes/iapmo-new-owner-of-national-standard-plumbing-code/ That appears to be used in Maryland and New Jersey.

On B, that is more permissive than IPC and UPC I think.

 

[Kreemoweet]

Personally, I think 30 inches max is ridiculous. Even though the UPC is in effect here, I always made the
standpipes higher, so, y'know, the hose bend and valves (if a washer box is used) are actually reachable
and not hidden behind the washer. Never a complaint from an inspector.

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.