White waste pipes

[Tristar]

Can anyone provide a definitive answer:

Why push fit and solvent fit pipes of nominally the same size, e.g. 1.5", are not actually the same size.

It would be so much easier if you could use them for either.

Also, can anyone who knows about plumbing standards, explain why these sizes vary so much between suppliers (apart from their own commercial interests), such that it is difficult to mix different brands. Is there no British Standard applicable to these?

Thanks.

 

[seco services]

so it confuses the diy'er

 

[Tristar]

Thanks very much, most informative.

 

[seco services]

Why push fit and solvent fit pipes of nominally the same size, e.g. 1.5", are not actually the same size.

they aren't the same size. pushhfit is the smallest then compression then
solvent weld.
but solvent weld pipe can be used on compression fittings.

 

[newbuildinstaller]

Push fit waste pipe is smaller so as not to be confused with solvent weld. This is because push fit waste is made of a different kind of plastic that cant be glued. Push fit waste can also withstand higher temperatures so it can be used on safety discharge pipes. I always use solvent on bathroom etc as once it is water tight it stays water tight. If you need to connect the two kinds of wastes use a compression fitting with two rubber rings. Theres not just different sized plastic there's even Lead stainless steel and Copper wastes commonly used. Also you can interchange all brands of solvent fittings and pipe push fits can vary slightly but most can be interchanged

 

[kirkgas]

Can anyone provide a definitive answer:

Why push fit and solvent fit pipes of nominally the same size, e.g. 1.5", are not actually the same size.

It would be so much easier if you could use them for either.
Also, can anyone who knows about plumbing standards, explain why these sizes vary so much between suppliers (apart from their own commercial interests), such that it is difficult to mix different brands. Is there no British Standard applicable to these?

i agree but it is the same as asking why a vauxhall starter motor wont fit in a ford, it does the same job and is governed by the same manuf rules but they make their own, simples, on the pipe front it must be to do with the material and its ductle strength or something, the bore is the same but the pipe wall is different.
your second point about why the sizes vary is answered above as well, and i dont think you are a mile off by suggesting they want to tie you into buying their own stuff, each type of pipe will be governed by a BS doc but it cant make everyone make the exact same part/material etc, its not a problem for those of us who know how to solve the install problems

 

[Burnerman]

Solvent weld stuff needs an acrylic cement to glue it.....push fits would need a polystyrene cement so maybe thats why?
John

 

[compheat]

Push fit waste pipe is smaller so as not to be confused with solvent weld. This is because push fit waste is made of a different kind of plastic that cant be glued. Push fit waste can also withstand higher temperatures so it can be used on safety discharge pipes. I always use solvent on bathroom etc as once it is water tight it stays water tight. If you need to connect the two kinds of wastes use a compression fitting with two rubber rings. Theres not just different sized plastic there's even Lead stainless steel and Copper wastes commonly used. Also you can interchange all brands of solvent fittings and pipe push fits can vary slightly but most can be interchanged

Solvent weld is made of ABS plastic this can withstand much higher temps than push fit, which is made from polypropelyne.
check out the info from manufactures

 

[Happyplumber]

I use high temperature solvent weld all the time,I think new gas installer has got his information muddled up somewhere

 

[Tristar]

Thanks for all the replies, however, while these explain thedifferences between solvent & push fit, I am none the wiser as to why solvent & compression could not be made the same size, even if different material.

Cheers

 

[TicklyT]

For the same reason that cars designed to burn only unleaded petrol have a smaller filler neck on the fuel tank than cars that aren't - it's meant to stop people sticking the wrong thing in the wrong hole!

If pushfit and solvent weld were made the same size, but in different materials, it's inevitable that some would attempt to fit solvent weld fittings onto pushfit pipes with possibly disastrous consequences.

With the investment in dies and tooling, it would be uneconomical for a manufacturer to change the specification of, say, their push-fit fittings, and probably something close to commercial suicide to make them a size that's incompatible with their other products.

 

[Norcon]

I use high temperature solvent weld all the time,I think new gas installer has got his information muddled up somewhere

Temperature limit for ABS is about 60c.
Polypropylene pushfit is approved for unvented cylinder discharge piping as newgasinstaller states.
Maximum temperature is around 120c I think.
The pipe should be be kite marked with BS 5254 or BS EN 1451 stamped clearly.

 

[OvertonPlumber]

Bret martin 1.5 " = 40mm Polypipe 1.5= 43mm Terrain 1.5" =39mm
Bugger hehe !

 

[Tristar]

Bret martin 1.5 " = 40mm Polypipe 1.5= 43mm Terrain 1.5" =39mm
b*****r hehe !

Exactly!!!

 

[joinerjohn]

I'm sure I posted a link to Tomplums videos on this very subject, but it's been removed.

I wonder if I'll get a reason why it was removed????