Specialty Tanks

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4.3.1.2   Vacuum

Vacuum monitoring can be used on steel, FRP and composite tanks. A slight vacuum is drawn on the interstitial space and then monitored. The vacuum will decay if a leak exists. Some systems monitor the rate of decay and automatically re-establish vacuum when it reaches a certain level.  

 

If the decay rate exceeds a preset threshold then the system will allow the vacuum to continue to decay until it reaches a point where an audible and/or visible alarm will be triggered alerting the operator of a problem.

4.3.1.3   Pressure

Pressure monitoring can be used on all types of tanks and piping. It operates in a similar manner to a vacuum system only using pressure instead of a vaccum as the medium for leak detection.