BobR wrote:

A machinist friend of mine once got a contract for producing a vacuum
pump that used compressed air. It operated on what I believe they
term the venturi effect. The compressed air was released at a point
where it pulled additional air from the vacuum feed line. The
resulting low pressure zone would pull a complete vacuum on a 55
gallon drum in a matter of seconds. It was amazing to see how
effective it was.

Did the drum immediately collapse?