Hi all -
I have a washing machine which connects to a trap under a sink via the normal corregated slinky pipe you get, and then this ubend goes straight out the wall as normal via 40mm overflow pipe. However recently I had to remove this pipe to get a lean-to shed in against the wall and the plan was to run the pipe back in exactly the same place, but now the shed's in I fancied the pipe being less in-the-way, so replaced it was 21.5mm.
My thinking was that the pipe going to the sink was that width more or less, so surely it would be fine once it reaches the u-bend. But I'm not second guessing myself; it's working fine but I'm a little worried I'm going to burn the pump out or something.
Basically my brain is fighting with itself; to me in theory once it reaches the u-bend that water is no longer being pumped but is flowing out via gravity (particularly as you can't pump when there's a drain hole in the sink which would take any pressure out). But then I'm thinking that the water before the u-bend is being pumped so its flow rate is much faster and doesn't need as wide of a diameter.
Hmm... time to ask some smarter people me thinks! Thanks in advance!
I have a washing machine which connects to a trap under a sink via the normal corregated slinky pipe you get, and then this ubend goes straight out the wall as normal via 40mm overflow pipe. However recently I had to remove this pipe to get a lean-to shed in against the wall and the plan was to run the pipe back in exactly the same place, but now the shed's in I fancied the pipe being less in-the-way, so replaced it was 21.5mm.
My thinking was that the pipe going to the sink was that width more or less, so surely it would be fine once it reaches the u-bend. But I'm not second guessing myself; it's working fine but I'm a little worried I'm going to burn the pump out or something.
Basically my brain is fighting with itself; to me in theory once it reaches the u-bend that water is no longer being pumped but is flowing out via gravity (particularly as you can't pump when there's a drain hole in the sink which would take any pressure out). But then I'm thinking that the water before the u-bend is being pumped so its flow rate is much faster and doesn't need as wide of a diameter.
Hmm... time to ask some smarter people me thinks! Thanks in advance!
