OK, I'm going to say one more thing on the matter and then drop it. The
difference of compressibility between water and steam is an order of magnitude,
so naturally water would, for practical purposes, be considered incompressible
in that context. But, that was not the context of the original statement.
That had to do with cushioning freight car loads. Let me give an example
relative to that. It's not inconceivable that a standard size large car or
truck would have 30 feet of brake line. A tremendous amount of pressure is
applied to the brake fluid given the magnification of power brakes. If the
fluid was water with an approximately 1% of compression, the water in the line
would compress 3.6 inches, and that my freinds is one heck of a lot of brake
pedal movement. It's enough movement to act as an effective "cushion" or
spring, which is what the discussion started with. Not steam chests.
Ed Kozlowsky
Sanford, Maine
--- On Tue, 8/19/08, Rance and Bente <[EMAIL PROTECTED]> wrote:
From: Rance and Bente <[EMAIL PROTECTED]>
Subject: Re: {S-Scale List} Re: water compresses
To: [email protected]
Date: Tuesday, August 19, 2008, 9:34 AM
Hi all:
As we know, all liquids have different compressibility factors, Z. I
think Ed K said (rightly so) it wasn't worth arguing about - we don't
really need to be concerned about the compressibilities of liquids at
standard temperature and pressure. However, the compressibility factor,
which can be critical in engineering measurements/ predictions, are
definitely important when T and P increase. Anyhow, unless we are doing
live steam, enjoy modeling and don't worry too much about
compressibility (unless one is a worrier - then google it or get some
engineering/ physics books on changes of state)!
regards,
Rance Velapoldi (Tranby, Norway)
Robert Nicholson wrote:
>
> That's why diesel engines have flashcocks, too. Water in the
> compression chamber can destroy a diesel engine.
>
> In fact, that's the very foundation of hydraulics - fluids do not
> compress under pressure
>
> Bob Nicholson
>
> --- In [EMAIL PROTECTED] .com <mailto:S-Scale% 40yahoogroups. com>,
> [EMAIL PROTECTED] wrote:
> >
> >
> > In a message dated 8/18/2008 11:52:21 AM Eastern Standard Time,
> > soldado7264@ ... writes:
> >
> > I don't want to get off topic, but actually water compresses quite
> nicely.
> >
> > Any steam engineman would disagree---reason for steamcocks on
> cylinders of
> > locomotives. Water DOES NOT compress, will destroy cylinders, hence
> the drains.
> > When I ran "Little Toot", always left the station with the cocks open,
> > closing them on the first turn.
> > Jim Lyle
> >
> >
> >
>
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