Solvent or push-fit?

[TonyR1]

Can anyone explain why we have two different sizes of waste pipe for solvent weld and push-fit connectors? Why didn’t they just make the push fit connectors a bit bigger so they would push on a solvent weld pipe rather than have the confusion of needing a different size pipe and compression fittings to switch between them? It would make sense for the manufacturers and stockists too in almost halving the inventory they have to carry.

 

[Basher]

Perhaps to stop people inadvertently (or deliberately!) using solvent cement (for PVC pipe) on push fit (polyprop pipe) which wouldn't work!

https://www.hendersons.co.uk/pipework2/page2.html

 

[TonyR1]

Perhaps to stop people inadvertently (or deliberately!) using solvent cement (for PVC pipe) on push fit (polyprop pipe) which wouldn't work!

https://www.hendersons.co.uk/pipework2/page2.html

Seems unlikely as they could do the same with compression fittings which fit on both pipes. Anyone trying to solvent weld a push-fit shouldn’t be plumbing in the first place but not sure it wouldn’t work. A bit like smearing some LSX on a push-fit? Not needed but will just add an extra seal into the mix.

 

[Basher]

Seems unlikely as they could do the same with compression fittings which fit on both pipes. Anyone trying to solvent weld a push-fit shouldn’t be plumbing in the first place but not sure it wouldn’t work. A bit like smearing some LSX on a push-fit? Not needed but will just add an extra seal into the mix.

I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.

 

[TonyR1]

I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.

Even so that’s only a problem because they not only make two “32mm” pipe sizes and from different materials. There is no reason I can see why a push-fit wouldn’t work on an ABS or PVC pipe if it were made with a 1mm larger ID.

 

[ShaunCorbs]

I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.

Years ago they used to be the same size and I would yes that’s what’s happened/ why the difference between the two exists

 

[ShaunCorbs]

Even so that’s only a problem because they not only make two “32mm” pipe sizes and from different materials. There is no reason I can see why a push-fit wouldn’t work on an ABS or PVC pipe if it were made with a 1mm larger ID.

Other way round push fit on solvent weld

Push fit is a different material that’s capable of taking a higher temperature for a longer period without failure

 

[TonyR1]

Other way round push fit on solvent weld

Push fit is a different material that’s capable of taking a higher temperature for a longer period without failure

Since they are quite happy to sell both materials for waste plumbing I doubt that the high temperature resistance difference is an actual problem.

 

[ShaunCorbs]

Since they are quite happy to sell both materials for waste plumbing I doubt that the high temperature resistance difference is an actual problem.

Yes different kinda of plumbing eg plumbing for safety discharges etc