Water speed on overflow pipe

BegBorrowSteal · 1 Jan 2020

Hi all just wondering what speed the water should flow out of a cold water tank overflow pipe reason is I installed a new cold water tank to fed a power shower as my other smaller tank wasn’t big enough it now feeds the hot water cylinder, so I made the new tank overflow to test my connections and the water comes out like a slowish running tap whereas the smaller tank comes gushing out like a hose and empty’s the tank till it’s below the dip tube both are connected to the same pipe to the outside just can’t understand why both aren’t the same.

Newboy · 1 Jan 2020

The short answer is the overflow/warning pipe should be able to flow faster than the inlet.

Have you (correctly) fitted a bylaw 30 kit to the new overflow?

John D v2.0 · 1 Jan 2020

Depends on the resistance on the pipe and the height over the overflow level of the water. Is the larger tank overflow flatter, longer and has more elbows?

BegBorrowSteal · 1 Jan 2020

The pipe work is pretty much the same apart from a longer straight run along a wall I’m thinking maybe sharing the pipe is the problem I think I’ll try connecting the new tank to the pipe on its own and see if it empty’s better failing that I’m at a loss as I don’t want to drill a hole through the wall.

BegBorrowSteal · 1 Jan 2020

Yeah both are new bylaw tanks and I fitted both myself months apart it’s just weird why one empty’s so good and the other isn’t.

Newboy · 1 Jan 2020

Have you checked that the pipework is falling?

CBW · 2 Jan 2020

Edited.

dilalio · 2 Jan 2020

Either way, surely the noise of it discharging onto whatever is below, is enough to alert you to a defect, in the event of a failure!

BegBorrowSteal · 5 Jan 2020

Just a update the new tank is now emptying like the other tank ie flooding out so it’s either because it isn’t sharing a pipe any more or it’s because there is no Horizontal run probably the latter.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Water speed on overflow pipe

Newboy

Newboy

Similar threads