Re: HO Tank Car Lid

Allen Cain

Impressive demonstration.

If I am reading the vacuum gauge correctly it reads 15 inches of Mercury which is just over 7 PSI which is not much at all.  But spread over the entire interior service which is a lot of square inches it adds up to a lot of force.

The increase in vacuum pressure is directly related to the increase in "air" volume as the tank is emptied.

So venting a tank car filled with liquid while emptying it from the bottom valve is pretty critical.

Allen Cain

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