Re: HO Tank Car Lid

Charles Peck

A vacuum gauge reading minus 27 is not reading pounds per square inch.
It is reading inches of mercury that the vacuum can lift.
Chuck Peck

On Mon, Nov 23, 2020 at 5:47 PM Tony Thompson <tony@...> wrote:
Claus Schlund wrote:

What Ed is trying to say is that normal atmospheric pressure is about 14.7 PSI.
Thus a PERFECT VACUUM would read at -14.7 PSI (note the minus sign).
Therefore, a "vacuum at -27psi" is not possible under any circumstance on earth

They pulled a higher vacuum with a vacuum truck. Those are usually used for sucking out clogged sewer pipes and the like and obviously exceed “full” vacuum (14.5 psig). I don’t know HOW it works, tho.

Tony Thompson

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