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Re: [PSUBS-MAILIST] motor thought



Hi Risk.
 
Thanks for your explaination and for taking the time to try to help me understand how the dynamics of this works.
Bill Akins.
 
 
 
----- Original Message -----
Sent: Saturday, April 08, 2006 11:44 PM
Subject: Re: [PSUBS-MAILIST] motor thought

 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.