45 degree slope of 3" waste pipe?

[dthomas2]

Sorry, No picture.

Twice this last week I saw horizontal 3" waste pipe dropped a foot or two over three to five feet span (with the use of 45 degree splices.) I have seen nothing in my library that says "don't do it this way ..." Although, because my material makes no exception to the to 1/4 - 1/8" rule I noted in these reports that elevation changes accomplished in this way will eventually cause problems and should be changed to 90 degree transitions. Am I correct?

[Dale Duffy]

Dennis, if you ever had to clean the line 45's would allow a snake through without dismantling.

[Jeffrey R. Pope]

90's are more likely to cause problems in drain line than 45's. . .

Neither is improper.

[dthomas2]

ouch!

[Darrell B. Hadler]

Don't see how this could cause a problem. I would far sooner see a couple of 45's used in the manner you stated, than a 90. Better flow with lest restriction, and as mentioned in previous posts...much easier to snake/auger.

[jschulte]

I think the problem generally comes from the fact that if you have too much slope, solids will build because the liquids drain too fast. However, if it's over a short span, I do not think it will be a problem, especially if it drains into a vertical line. I would consider a three to five foot span a short distance.

Just my opinion, though, I haven't spent much time in a drain line to see it happen.

[dthomas2]

Thanks guys.

Right now I am googling to see if I can find a definitive statement. The problem is that the charts and write-ups I use as reference do not sight exception to the 90 degree rule. Since I fear overlooking a problem with a seemingly correct situation I would like to see a research related report - so I am trying to find one.

[ckratzer]

Originally Posted by dduffy

Dennis, if you ever had to clean the line 45's would allow a snake through without dismantling.

I'd be guessing Dale has done the research .
Hands -on experiance. Thats what I'm talking about .

[lcapaul]

Originally Posted by dthomas2

Thanks guys.

Right now I am googling to see if I can find a definitive statement. The problem is that the charts and write-ups I use as reference do not sight exception to the 90 degree rule. Since I fear overlooking a problem with a seemingly correct situation I would like to see a research related report - so I am trying to find one.

Dennis,

Do you have the Code Check 4th Edition? On page 14 under drainage/changes of direction it states:

Vert to horiz or horiz to horiz through wye branches or 45 degree wy branches of fittings of equal sweep IRC 3005.1 UPC 706.3,4

Hope that helps.

[lcapaul]

Originally Posted by lcapaul

Dennis,

Do you have the Dode Check 4th Edition? On page 14 under drainage/changes of direction it states:

Vert to horiz or horiz to horiz through wye branches or 45 degree wy branches of fittings of equal sweep IRC 3005.1 UPC 706.3,4

Hope that helps.

Dennis,
I knew I'd read it some where, in Howard Massey's Plumbers Handbook on page 25: Verticle offset in Drainage Pipes,,,,,"You can consider as straight any verticle stack with an offset of 45 degrees or less. Size it as a straight vertical stack....."

Just make sure the fittlings don't reduce the diameter of the pipe or have any ridges that may cause an obstruction.

[scosta]

This is what I have.

[lcapaul]

UPC 706.4

706.4 Vertical drainage lines connecting with
horizontal drainage lines shall enter through fortyfive
(45) degree (0.79 rad) wye branches, combination
wye and one-eighth (1/8 bend branches, or other
approved fittings of equivalent sweep. Sixty (60)
degree (1.05 rad) branches or offsets may be used
only when installed in a true vertical position.
SANITARY DRAINAGE
113

[dthomas2]

Originally Posted by lcapaul

UPC 706.4

706.4 Vertical drainage lines connecting with
horizontal drainage lines shall enter through fortyfive
(45) degree (0.79 rad) wye branches, combination
wye and one-eighth (1/8 bend branches, or other
approved fittings of equivalent sweep. Sixty (60)
degree (1.05 rad) branches or offsets may be used
only when installed in a true vertical position.
SANITARY DRAINAGE
113

Lewis,

Thanks for the effort. Does the UPC distinguish between a Solid waste drain and a sink/basin drain? Is the "706.4" referring to a solid waste drain?

[dthomas2]

Originally Posted by scosta

This is what I have.

Steve,

I have this picture too and is why I have a problem with contray statements. I did not find an exception with my google search but for some reason I could not get to the UPC - except to purchase. I may go the Library of Congress.
Thanks for the help.

[lcapaul]

Dennis,
Here's a link to chapter 7 of the UPC

http://www.iapmo.org/common/ROP2004/...eprint/ch7.pdf

(If you want to see other chapters just change ch7 to whatever number you want.

Where are our plumbing guru's? I'm not sure about the verticle drop in the horizontal drain lines using 45's, but I think your statement "I noted in these reports that elevation changes accomplished in this way will eventually cause problems and should be changed to 90 degree transitions." was pretty good, although I would have used "May" instead of "will" cause problems and wouldn't have mentioned changing the fitting to 90 degree, I'd leave that up to a plumber