In a passive leak detection system an indication of a leak in the liner only shows up when the leak emerges from the leak detection hole. Or, in case the leak detection hole is connected via tubing to for example a bottle with a phenolphthalein solution, when the colour of the liquid in the bottle changes. The detection occurs at a later moment then when the leak occurs in the liner. Time passes (dwell time) between the moment the leak occurred and the moment the leak emerges at the leak detector or when a field operator notifies the leak. The latter case is even worse as the dwell time can be much larger. During that dwell time the risk that the leak detection path gets clogged is realistic. That means that there will be a serious threat to the integrity of the carbon steel pressure bearing wall… Click here to Read more.

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