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thanks mate will be on a course soon but was just curious as to why these particular measurements ie 10mb and 20mb.

hi guys im not in training but will be shortly was doing some reading on tightness testing nat gas and saw that a let by test is at 10mb for 1min and a tight test is at 20mb for 2min i was wondering what determines these numbers why 10mb for let by? and 20mb for tight test? and is a tight test...