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Solvent or push-fit?

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TonyR1

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

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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.
 
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TonyR1 said:
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.
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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.
 
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Basher said:
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.
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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.
 
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Basher said:
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.
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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
 
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TonyR1 said:
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.
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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
 
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TonyR1 said:
Since they are quite happy to sell both materials for waste plumbing I doubt that the high temperature resistance difference is an actual problem.
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Yes different kinda of plumbing eg plumbing for safety discharges etc
 
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