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Maximum pressure of waste pipe

Does anyone know the maximum pressure 42mm or 50mm plastic waste pipe
can hold when jointed by solvent weld glue? I can't see anything on
the web sites.
TIA
Reply to
timegoesby
Loading thread data ...
If you're asking about rated max pressure, then there isn't one - they aren't designed for pressure operation, and should only be used in open systems.
If you're asking how much pressure can they really take, then I've used 42mm pipe as a reservoir at 5 bar without any problems. That was for air.
Reply to
Grunff
You won't, as they are only designed for use at atmospheric pressure. Anything higher is entirely at your own risk.
Colin Bignell
Reply to
nightjar
"nightjar .uk.com>"
They are designed to take a maximum pressure as drain pipes under heavy use in a building with 3 or 4 floors can have a quite a bit of pressure on them. A building that is 50 foot high with block drain all up the stack has quite a pressure at the bottom of the stack.
There are solvent weld plastic pipes on surface water systems, usually on farms and in industry. I don't know much about this stuff so can't help. I recall reading that solvent weld can take 1 to 2 bar, but the makers are the people to contact, as there is about three types of PVC pipe. I am surprised this info is not on their sites.
Reply to
Doctor Drivel
You shouldn't be using 42mm or 50mm pipe to drain a 4 storey block of flats. They should be feeding into a vented stack of at least 100mm diameter and a blockage at the foot will only have the back pressure generated by the height necessary to overflow the lowest outlet on the ground floor.
Colin Bignell
Reply to
nightjar
"nightjar .uk.com>"
Not if the toilet is way high and the only one. It could be a loft extension and an en-suite. I was on about the solvent weld, not particularly the pipe size. The pipe itself will take quite a pressure before it pops. 5 bar was given here, and no problems in weld and pipe.
Reply to
Doctor Drivel
The pipe size is relevant, as different British and International Standards apply to different sizes, materials and applications of waste pipes. My initial comments applied only to small bore pipe as usually sold for use as waste pipes.
That is fairly meaningless unless we know the pipe size, material, grade and application and whether those are in any way related to the pipe being used by the OP. That pressure is, for example, more than ten times what should be applied to 100mm - 400mm underground pipelines during a water test.
Colin Bignell
Reply to
nightjar
...
As I said, that is fairly meaningless information without knowing the pipe size, material, grade and application. Some pipes are designed to accept that sort of pressure, while others will be overstressed by it.
Colin Bignell
Reply to
nightjar

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