How a vacuum system is able to detect clogging in the tubing ?

When talking about active leak detection systems, one can distinguish a pressurized system, in which an inert carrier gas stream flows through the leak detection circuits and a vacuum based system, where one pulls vacuum pressure behind the liner. All liner compartments are connected in a logical and economical manner via tubing to the ammonia analyzer.
In a pressurized system a flow indicator should be installed to detect clogging.
In a vacuum system vacuum pressure exists in the complete leak detection system; the achieved vacuum pressure is a result of the capacity of the vacuum pump and the amount of ambient air leaking in via the tubing connections. It is unavoidable that some ambient air will enter into the system.
Once a clogging does occur somewhere in a section, the part between the clogging and the vacuum pump / ammonia analyzer will remain under vacuum pressure and under detection. However, the part between the atmospheric ball valve and the clogging will rise in pressure until atmospheric pressures has been reached. This allows for a detection of clogging also in a vacuum system as described below ...

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What is reason number 7 to choose for a vacuum system ?

We recommend to use a vacuum based leak detection system for several important reasons:

Reason #1: No risk of liner bulging (refer to FAQ 6)
Reason #2: Direct coverage of the complete carbon steel surface of a compartment (refer to FAQ 7)
Reason #3: A vacuum system is less prone to clogging (refer to FAQ 9)
Reason #4: A vacuum system does not restrict the leaking flow and does not built-up pressure or introduces risks for backflow (refer to FAQ 10)
Reason #5: A vacuum system also works when there is only one leak detection hole in a liner compartment (refer to FAQ 11)
Reason #6: A vacuum system also works when there are clogged grooves or no grooves (refer to FAQ 12)
Reason #7 is: A pressurised system requires a dedicated ammonia analyser for each high pressure equipment item whereas a vacuum system needs only one ammonia analyser for all high pressure equipment items to realise the same reliability.

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