Joining PVC to CPVC

[Menagerie-Manor]

Here’s a 1/2” and 3/4” pvc and cpvc coupler. They’re not even close to the same. View attachment 710726

Here’s a 1/2” and 3/4” pvc and cpvc coupler. They’re not even close to the same. View attachment 710726

Yep it's different because it's Copper tube sized like I mentioned earlier. Horrible to deal with when it's 50 + years old, every piece I ripped out of my house literally exploded in my hands it was so brittle.

 

[4570Man]

Yep it's different because it's Copper tube sized like I mentioned earlier. Horrible to deal with when it's 50 + years old, every piece I ripped out of my house literally exploded in my hands it was so brittle.

No you said they were the same size and would interchange. They’re not the same size. And I do agree 100 percent that cpvc is trash.

 

[Menagerie-Manor]

No you said they were the same size and would interchange. They’re not the same size. And I do agree 100 percent that cpvc is trash.

Not sure you understand, did you even look at the schedule I linked earlier. Standard PVC and CPVC pipe has exactly the same dimensions. your focused on a little used type of cpvc that is based on copper tube size that is no longer used by professionals in new construction.

 

[4570Man]

Not sure you understand, did you even look at the schedule I linked earlier. Standard PVC and CPVC pipe has exactly the same dimensions. your focused on a little used type of cpvc that is based on copper tube size that is no longer used by professionals in new construction.

Every CPVC I’ve ever seen was smaller outside diameter than pvc. You’re right it’s not used anymore because most people are using pex but you can go down to the hardware store and buy a stick of pvc and a stick of cpvc and they won’t glue together. I looked at your schedule you posted but it’s wrong. CPVC and PVC are different pipes, with different dimensions and they will not interchange. It would be just as logical to discuss gluing pex to pvc.

 

[ROUSTABOUT]

Something not making sense as the OD for all sizes of sch 40 pvc and cpvc are the same regardless of size.

No they not. Not in pvc.

 

[ROUSTABOUT]

Not sure you understand, did you even look at the schedule I linked earlier. Standard PVC and CPVC pipe has exactly the same dimensions. your focused on a little used type of cpvc that is based on copper tube size that is no longer used by professionals in new construction.

He said cpvc was available at his local hardware store.

 

[Menagerie-Manor]

Every CPVC I’ve ever seen was smaller outside diameter than pvc. You’re right it’s not used anymore because most people are using pex but you can go down to the hardware store and buy a stick of pvc and a stick of cpvc and they won’t glue together. I looked at your schedule you posted but it’s wrong. CPVC and PVC are different pipes, with different dimensions and they will not interchange. It would be just as logical to discuss gluing pex to pvc.

The schedule I posted is a national standard for schedule 40 pipe up to 12" and does not matter what material is used (except copper which is only produced as tubing) such as plastic, steel, brass, stainless, and is available on every manufacturers web site.

Yes you are correct the CTS CPVC in that form is not the same as schedule 40.


CPVC is available in many different piping products and systems with the most common being schedule 40

 

[quicksandfarmer]

FWIW...for typical plumbing and other industries...the size cited for piping is the inside dia....be it copper, pvc etc., etc...

i.e., 1" PVC is 1" inside and so on...

Sort of true. Since fittings go on the outside of pipe, the outside diameter becomes the standard even for materials with different wall thicknesses from the original. So 1/2" copper has an inner diameter of 1/2", but plastic pipe made to CTS -- Copper Tube Size -- usually has a smaller inside diameter because it requires a thicker wall to have the same strength.

PVC pipe is made to have the same outside diameter as an iron pipe with an inside diameter of the nominal size, but it will be smaller on the inside because PVC has to be thicker than iron. And PVC comes in different "schedules" or thicknesses so the inside diameter varies. Also, iron pipe today tends to have thinner walls than when the iron pipe standard was created -- they've gotten better at making it. The outside diameter hasn't changed, but the inside diameter is larger.

Next we'll discuss why a 20' piece of pipe is 21' long.

 

[4570Man]

CPVC is available in many different piping products and systems with the most common being schedule 40

I don’t know where you came up with schedule 40 cpvc being the most common but it’s not. You’d probably have to go to a specialty plumbing supply to even buy it and I wouldn’t hold your hopes high then. If it’s cpvc and it’s in a house it’s not schedule 40.

 

[Menagerie-Manor]

I don’t know where you came up with schedule 40 cpvc being the most common but it’s not. You’d probably have to go to a specialty plumbing supply to even buy it and I wouldn’t hold your hopes high then. If it’s cpvc and it’s in a house it’s not schedule 40.

Never said it was the most common in a house, it's the most common produced. I've already stated you were correct with that type of cpvc not being the same diameter so not sure why your continuing to beat the horse.