Expansion Joints in Waste Water

[tcarnell]

Hi,

A bit of advice really from those in the 'know'.

When fitting waste water pipes (32mm/40mm/50mm), if you're using solvent jointed connections is there a requirement for expansion in the pipework?
Should a push-fit connection be fitted every x metres to allow the system to expand and contract?

Thanks in advance for all advice offered.

Tony.

 

[GreenArmy]

No, no requirement for expansion.

 

[oldplumber]

only if you want leaks later on. Push fit wastes are used mainly by the diy market for ease of use.

 

[justlead1]

Hi. The expansion on plastic is great, if tight anchor points exist in the installation it is wise to fit expansion joints, to avoid stressing the pipe and fittings. Which can result in clips being pulled out of fixings and bows in pipe work affecting the dynamics of the system. Good luck

 

[oldplumber]

my understanding is that you don't want to fix waste pipework such that it is so tight it can't expand anywhere, ie leave space at elbows and don't tighten clips on to much such that pipework cant move. Plastic comp and pushfit joints are prone to leak in the long term from experience so ensure if you do use them you can get to them easily, think of the poor sap following on to remedy any problems, it may be you!

 

[migoplumber]

depends on how long the pipe run is. never clip within 300mm of a 90 corner, if the run is more than 12metres than a dilation loop is a good idea but not required under any regs i have seen here. dont think you should have more than 12 metres anyway without upsetting building regs.
on a vertical pipe over 9 storey high then rubber ringed elbow brakes should be fitted - again dosnt happen here !

 

[oilman]

if you are more than 3 metres you are on 50mm pipe anyway

 

[tcarnell]

Thanks for all the advise you've all given to this question, it's certainly helped me towards the decision to use all solvent weld fittings.

Moving this topic on to soil pipes if I may, if I'm installing a short run (approx. 3m) in a floor void, I'm guessing that you would all have the same opinion as far as push-fit versus solvent welded joints are concerned?

As before, all help and advise is very gratefully received.

Tony.

 

[tackleburger]

Push fit on soil & vent is pretty good tight as f***k actually. Easy to work with when adding on moving stuff etc. I generally use push fit soil & Vent and always use solvent weld ABS waste.

You will find that with S&V not all fittings seem to be available easily in solvent weld.

 

[stevetheplumber]

when plastic soils first came out we were fitting at least one expasion joint in solvent welded systems and on higher stack one per floor somewhere along the way they seem to have dropped it as common practice im sure the terrain web site will tell t=you the newest6 ideas