The solvent in the adhesive dissolves the plastic and they merge into one piece. One may also ask, what can dissolve PVC? Check with your local plumbing inspector. PVC cement is actually a solvent. Welding involves melding two pieces of the same material into one.
When you solvent weld PVC , you are actually turning the two sides that you are joining into PVC mush, the molecules all blend together, and what you are left with is essentially one single piece of PVC.
Can I join solvent weld to push fit? Solvent weld fittings shoul;d be tight on the pipe before the weld is applied. Drainage and vent piping shall not be drilled, tapped, burned or welded.
The following types of joints and connections shall be prohibited: 1. Cement or concrete. Mastic or hot-pour bituminous joints. Joints made with fittings not approved for the specific installation.
Joints between different diameter pipes made with elastomeric rolling O-rings. Solvent-cement joints between different types of plastic pipe. Saddle-type fittings. Drilling, tapping, burning and welding to create fittings for connections are prohibited because these means do not create the smooth transitions afforded by directional fittings and can damage the pipe. This section provides requirements for joints between pipe and fittings of different materials.
Cement and concrete are not effective in sealing a pipe joint because such materials are inflexible and susceptible to cracking and displacement. A rolling O-ring has no resistance to being pushed or rolled out of a joint when exposed to pressure or the movement of pipe caused by expansion and contraction.
A solvent-cement joint is a homogeneous chemical bond made between a pipe and fitting. It's technically not right, but that's all. I have yet to find a single failure at this connection point.
I've talked to a handful of experienced plumbers about this, and not one of them have seen this connection fail either. I typically point it out as an improper installation, but I leave it at that. I don't tell people to rip it apart and put it back together. Why would I? Just for fun, I did a little experimenting at home to show how some of these different types of cement hold up.
I started by cementing a bunch of materials together with a bunch of different types of cement. I waited 24 hours, then cut each one roughly in half, down the middle. Next, I cut each section in half lengthwise and put the coupling in a vice to get the materials to separate.
It actually seemed to pull the surface of the ABS right off of the pipe. The only connection that refused to come apart was the ABS to ABS; the plastic would probably rip apart before that connection would fail. I think failure is close to impossible; if I hadn't used a vice, there's no way I could have separated the two.
There's no need to lose sleep over connections like this. Reuben Saltzman is a second-generation home inspector with a passion for his work. Naturally, this blog is all about home inspections and home-related topics in the Twin Cities metro area. Home All Sections. Log In Welcome, User. Coronavirus Minneapolis St. Paul Duluth St. California, Colorado, N. Audience member disrupts Guthrie's 'A Christmas Carol'.
He and I actually went to the hardware store and bought the parts right then and there that he said I needed. It was a guy I knew from middle school who said he had 15 years experience which I now seriously doubt. He literally screwed up every single thing he was supposed to fix particle board instead of plywood for sub floor that will be tiled, gluing the toilet flange onto the sub floor itself, positioning the flange crooked so the toilet wouldn't even fit back onto it.
Suffice to say, I'm not letting him touch anything else in my house. In order to get the flange off the new PVC pipe before I realized the wrong glue was used on the other end , I had to heat it up with a heat gun and carefully pry off the flange. I don't want to take any chances especially since I'll be tiling on top later. I'm not sure if there's any difference in regards to removing. Joined: Sep 2, Occupation: Retired Systems engineer for defense industry. Location: New England. A properly made plastic pipe connection shouldn't release by heating.
The cement is actually a solvent with dissolved extra plastic in it While you can use a transition cement, what may be a safer solution is the more costly banded coupling. Some have a single clamp at each end, which also works, depending on the situation.
Joined: Sep 25, Location: IL. And then, after heating, you removed that PVC closet flange, and are left with a 3 inch ABS pipe or fitting sticking up, and that there is residual cement on the outside of the ABS pipe? Normally, you would glue the flange to the pipe after the file was in place. Last edited: Aug 28, Reach4 , Aug 28,
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