Rules on using 90 deg. el in dwv

[eagleslawyer]

section 706.3 IPC dictates what are acceptable changes in direction. I've got some questions as there is conflicting information out there.

Can a 90 be usd? Or do I need to use several fittings?

I've got everything cut and strapped. Just need to glue it all up. Will post some pics before gluing.

[master plumber mark]

are you dropping down with the 90??

or are you turning sideways??

dropping straight down is no big deal, crap falls just fine.

if you are making a horisontal turn it would be best to use a coulple of

street 45s to make that bend or something large will decide to stpo up at that elbow. some long sweep 45s are best for a horizontal turn.

[eagleslawyer]

I cant find my pipefitters handbook, it had this very problem in there....

I remember its something about adding the square roots of the travel and the run...depending on whether your doing a 45 or 30 or 22 offset.

I've been out of the trade so long, it bugs me becuase I used to be able to do this in my sleep. And then the next day drill 3,000 hilti anchors to hang it all....

[RioHyde]

IPC Table 707.3

Quarter bend may be used:

Horizontal to vertical

Vertical to horizontal <only on a 2" and smaller fixture drain>

Horizontal to horizontal <only on a 2" and smaller fixture drain>

[hj]

A standard quarter bend, (elbow), can be used to transition from a horizontal line down into a vertical one. Every place else a long radius quarter bend is required. It is the same as two 1/8 bends (45'sa).