What is reason #4 to choose for a vacuum system ?

Active leak detection systems can either be a pressurised or a vacuum based system (refer to FAQ 5). We recommend to use a vacuum based leak detection system for several important reasons.
Reason #1 is: No risk of liner bulging (refer to FAQ 6)
Reason #2 is: Direct coverage of the complete carbon steel surface of a compartment (refer to FAQ 7)
Reason #3 is: A vacuum system is less prone to clogging (refer to FAQ 9)
Reason #4 is: A vacuum system does not restrict the leaking flow and does not built-up pressure or introduce risks for backflow
But why is that ?
The validity of this fourth reason has been proven by Incident 19-005, details about this incident can be found via the following link:…

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