Gluing SCH80 and SCH40 together?

[ReeferBud]

I just bought a used pump that has a SCH80 spears union already glued to the volute and I need to connect to the rest of my system’s plumbing, which is SCH40.

can i glue a SCH80 union to a SCH40 pipe or are the sizes incompatible or will I risk leaks in the future?

 

[Fishyfish22]

I just bought a used pump that has a SCH80 spears union already glued to the volume and I need to connect to the rest of my system’s plumbing, which is SCH40.

can i glue a SCH80 union to a SCH40 pipe or are the sizes incompatible or will I risk leaks in the future?

As long as they're the same measurement I believe you should be fine (1" with 1")

The difference between the two is the thickness of plastic, but it's internal/external diameter where the difference lies. As far as connecting to each other they're fine.

 

[nim6us]

The wall thickness is greater on the the 80 but that only affects the inside diameter. Both 80 and 40 will have the same outside diameter. I’m no plumber so I can’t speak to if this against best practice. However if you’re asking will it fit, then yes it will.

 

[malacoda]

You'll be fine.

The wall thickness on the 80 is thicker, but the outside diameter will be the same as the OD on a similar piece in sch40.

The two schedules can be mixed and matched without worry ... unless you're using it a very high pressure situation (non-reefing obviously) that calls specifically for sch 80.

As with ANY pvc plumbing, dry fit first to make sure everything mates together the way you want it to.

 

[ReeferBud]

Thanks all! This is really helpful!

 

[Steven Garland]

You'll be fine. I'm a mechanical plumber,and I have had to do this numerous times transitioning from sch80 to sch40.

I just use a use a piece of sand cloth or sand paper,lightly clean whatever end you are gluing together. A little bevel on the end of the pipe,prime the pipe really good,put primer on the face of the end you are gluing ensuring you have a good area of adhesion and the joint in going to not leak.

I have tested these transition joints up to 100 psi and never had a leak or bad joint.

 

[ca1ore]

I have sch40 and sch80 throughout my system .... no incompatibility problems.