'Ungluing' pvc dwv pipe?

[bmead144]

Does anyone know of any product made to "unglue" solvent welded connections in pvc,cpvc & dwv pipes or if there even exists such a thing?Also whats the minimum horizontal drop/slope per foot for 3" dwv pipe?

[hj]

No way to take glued joints apart. 1/4" per foot is the minimum, there is no maximum.

[Gary Swart]

The answer to taking PVC connections apart is in your question. These are not glued joints, they are solvent welded. The so-called glue causes the surfaces of the pipe and fitting to soften briefly, mix together, and when the solvent evaporates, the parts are fused together. There is no way to reverse the process, and at the price of fittings and pipe, it isn't worth the time and effort to try to do it anyway. All drains regardless of size or material require 1/4" per foot or more slope.

[Clayton]

Minimum slope of 3" horizontal drain will depend on which code is enforced in your area.

The IPC and the IRC allow 1/8" per foot slope on 3" with 36 drainage fixture units or less.

[phinncraft@gmail.com]

hi i have a tool that will unglue any pvc ,abs,cpvc , pipe .it is made by debonding systems spokane wa

[Gary Swart]

I won't say BS to your device, but I will say I am highly doubtful that you can "unglue" a solvent welded PVC, ABS, or CPVC joint. The process of solvent welding melts the surfaces of both the pipe and the fitting and these mix or flow together when the joint is made and effectively make the weld.

[LLigetfa]

1/4" per foot is the minimum, there is no maximum.I am not a plumber but I did all my own plumbing when I built my house. ISTR the inspector mentioning that there was an ideal slope, that too much slope would separate the solid from the liquid. It might be a regional thing and/or fluid dynamics work different this far North.

[jimbo]

The idea that the solids will get left behind is a widespread fairy tale, which all plumbing codes debunk.