Greg's Challenge Question 2

The garden hose supplies a larger volume than the power washer uses so as long as the leak is small no part of the garden hose should experience negative pressure. If a very large leak like a cut or partially severed hose occurred it would be possible for water to leak out and air to enter.

"Will water leak from the hose, or will air leak into the hose from the atmosphere?"

Water will leak FROM the supply hose unless the hose is undersized or the supply valve is not fully open.

No. My son are trying to get a way out of doing the work and will trick me so that I will have to do it myself.

Where comes the water from? If it comes from a dwell then it is a risk. In fact the problem is limited to the question how big is the static pressure at the leak place? Is water pressure higher? it flows out

Is air pressure higher ? it will go in and the pump will cavitate.

Dear Greg,

1st. It will leak.

2nd. My son (if I had one!!) would probably pierce the hose to avoid the work!! :)

Best regards,

Abel

There is the pressure washer washer, the hose and , the house. To save time and effort in explaining the various things that could happen and the expense of rigging any gauges to test performance, lets just start the job and see if there are any difficulties.

I know my son(s) pretty well and I would take his question to mean that 1) he has run over the hose with the lawn mower and cut in two - and 2) he is try to use this as an excuse to get out of pressure washing.

If the hose has been cut in two then I would answer his question like this: The half of the hose that is connected to the spigot will discharge water to the atmosphere the half of the hose that is connected to the pressure washer will draw air in from the atmosphere because the pressure washer is a pump.

Now fix the hose and get to work.

My son would stop wasting time with silly questions and get to work or have a boot in his rear!

it is a very modern and progressive educational approach!!!!!!

I quess it may depend on the angle of the leak in the hose, if angled with or across the flow you will get a venturi effect and ingress air, but I'm sure it the boy was faced in the right direction and stopped working the angles he's be a lot better off.