Warning sprinkler hose lidl super market

fluffnutter

You're absolutely right of course, Azari. I remember posting a thread (How does water work?) querying why water didn't build up behind your taps (when they're switched off) til the point that everything just exploded. Hydrodynamics were explained very well on that thread. Boring as hell mind you.

molerat

Put your finger over the end of a hose and how much water comes out, none. Partly uncover the end and how much comes out, a small amount. Completely uncover the end and it gushes out. Same principle applies to these hoses. A small amount trickles through the pin holes, if they split it will gush out. I would have expected to use it with a timer if unattended though.

edit. was it this http://kompernass.com/pages/_pdfs/1f270727de48fb1b329e06c8c60e0280.pdf that is designed to be attatched to a water butt but the fittings seem to allow it to be fitted to a tap.

shaun_from_Africa

I've never used a Lidl drip feed hose so I can't comment on the instructions, but I have used these hoses from other retailers and they normally state the minimum and maximum input pressure that they should be used with.

It's normally fairly low and it it was exceeded it would be easy to see why the hose split.

Azari

fluffnutter wrote: »

You're absolutely right of course, Azari. I remember posting a thread (How does water work?) querying why water didn't build up behind your taps (when they're switched off) til the point that everything just exploded. Hydrodynamics were explained very well on that thread. Boring as hell mind you.

That aspect is simply visualised. Water pressure is caused by something pushing on water. In the same way that if you push on something you can't move, the pressure does not build up until it moves, similarly with water pressure.

MamaMoo_2

I used to put my finger partially over the end of the hose, and the water would come out faster due to the build up of pressure caused by the reduction in size of the hole. I just kinda figured it'd be the same here.
I may have to look for that thread, because I'm fairly clueless here

fluffnutter

Azari wrote: »

That aspect is simply visualised. Water pressure is caused by something pushing on water. In the same way that if you push on something you can't move, the pressure does not build up until it moves, similarly with water pressure.

Yep, that's how it was explained on the other thread. The analogy of pushing against a wall was used. And then I nodded off. I did ask though!

fluffnutter

MamaMoo wrote: »

I used to put my finger partially over the end of the hose, and the water would come out faster due to the build up of pressure caused by the reduction in size of the hole. I just kinda figured it'd be the same here.
I may have to look for that thread, because I'm fairly clueless here

I wouldn't bother. Unless you have insomnia.

Azari

MamaMoo wrote: »

I used to put my finger partially over the end of the hose, and the water would come out faster due to the build up of pressure caused by the reduction in size of the hole. I just kinda figured it'd be the same here.
I may have to look for that thread, because I'm fairly clueless here

Ah, yes, this is where it gets a bit more complicated.

What is happening there is this:

When your finger is not over the end of the hose the water issuing from the tap is passing unfettered out of the hose and will come out at around the same speed it is coming out of the tap.

When you obstruct the hole to the extent that the water cannot get out of the hose at the same speed it is entering from the tap, the inside of the hose will fill with water and then the pressure will increase until either it is equalised with that inside the pipe or it can force a part of your finger away from the edge of the end of the hose and force water out at the higher pressure that has built up.

An interesting tip if you ever want to know whether a tap is fed with mains water or water from a tank in the loft is to just turn it on and try and stop the water with your finger. If it is tank fed you will normally be able to do this. If it is mains fed you will not.

fluffnutter

Azari wrote: »

Ah, yes, this is where it gets a bit more complicated.

What is happening there is this:

When your finger is not over the end of the hose the water issuing from the tap is passing unfettered out of the hose and will come out at around the same speed it is coming out of the tap.

When you obstruct the hole to the extent that the water cannot get out of the hose at the same speed it is entering from the tap, the inside of the hose will fill with water and then the pressure will increase until either it is equalised with that inside the pipe or it can force a part of your finger away from the edge of the end of the hose and force water out at the higher pressure that has built up.

An interesting tip if you ever want to know whether a tap is fed with mains water or water from a tank in the loft is to just turn it on and try and stop the water with your finger. If it is tank fed you will normally be able to do this. If it is mains fed you will not.

I'm gonna try that right now!

Azari

fluffnutter wrote: »

I'm gonna try that right now!

I should put on a jumper or something as you might get sprayed with cold water.