[VAC] Re: Water Pressure

[James Clark <jec1938@xxxxxxxxxxxx>]

I'm scratching my head as well, but I think everyone is talking about 
pressure drop across an orifice being proportional to the flow...ie... no 
flow, no pressure drop... high flow a lot of pressure drop...

It is certainly possible to have high flow and high pressure at the same 
time...like the plumbing in a fireboat... lots of water moving and lots of 
pressure...and lots of work done if someone wants to get into that one... 
(no motion, no work...)

Having a trailer with all the various systems will bring you right back up 
to speed on basic physics if you work on them much... I almost bought into 
putting a pressure gage on an LP tank until I realized that the pressure 
would be fairly constant until the tank was empty...I also remember 
relearning that water is not very compressible... I filled the tank to 
overflowing and then applied the gas station air hose that must have had a 
fairly high pressure setting....water all over the 
place....immediately....the demand pump is a lot easier on the nerves...

I am still having trouble understanding why two regulators in series is a 
problem... I use an external at the supply faucet and it seems to work 
fine... maybe my internal is stuck open... I know the demand pump will put 
water out the inlet on the trailer if I don't cap it... I don't think that 
is normal either...

Jim