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Date:         Sat, 1 May 2004 00:07:01 +1200
Reply-To:     Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
Subject:      Re: for the record water is not corrosive
In-Reply-To:  <a8.2b5cd9cc.2dc385d1@aol.com>
Content-type: text/plain; format=flowed; charset=us-ascii

>In a message dated 4/30/04 12:36:25 AM, hradek@YAHOO.COM writes:
>
><< a sealed system should be mostly free of oxygen. >>
>
>Is there not some unavoidable cavitation on the periphery of the water pump
>impeller?
>
>George


Cavitation produces, I think, vacuum "bubbles". The water surface can
then return at speed & hit the impeller, thereby eroding (not
corroding) it. This also pits boat props.
--
Andrew Grebneff
Dunedin
New Zealand
<andrew.grebneff@stonebow.otago.ac.nz>
Seashell, Macintosh, VW/Toyota van nut
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