Akins, sorry for mispelling your name.
I think of it this way: The pump increases pressure over ambient by a set
amount. It CREATES lower pressure on the suction side by sucking water into
the pump. The volume of water it moves is the same regardless of depth. The
water "pushes" into the vacancy, and that "pushing" force is equal to the
resistance met on the other end. In shallow depth the water pushes and resists
less, in deep depth the water pushes and resists more, but it always does it
equally.
-----Original Message-----
From: Akins
<lakins1@tampabay.rr.com>
To:
personal_submersibles@psubs.org
Sent: Sat, 8 Apr 2006 17:23:43
-0400
Subject: Re: [PSUBS-MAILIST] motor thought
Of course I know that water molecules do not compress. Water is basically
uncompressable, but it can be pressurized.
I should have said "pressurize" instead of "compress" when I was talking
about the pump exerting force to move the water.
It was a symantic error, but hopefully you knew what I meant, just like I
know when you wrote "nozel" and "nozels" that
you actually meant "nozzle" and "nozzles", and when you called me
"Atkins" you actually meant "Akins". I will try to
watch my terms and keep them technically correct in the future.
You explained that the pump can suck and blow just as efficiently at 1000
ft as at 10 ft. I'm still trying to wrap my head around that.
In order for there to be an area of high pressure created by the impeller
at the pumps exit nozzle, doesn't there have to be an area of lower
pressure
on the other end of the impeller? If that is true, then
wouldn't an increased depth create more ambient water pressure on the low
pressure side and
make it harder for your pump to pressurize the water and result in less
force coming out the exit nozzle, and eventually equalize the pump's entire
force
output if you went deep enough? What am I missing here? As I said
before, I really haven't given this a lot of thought and just voiced the first
questions that came to my mind.
Bill Akins.