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In the earliest days of high pressure steam boilers, extremely small "tell tale" holes were drilled partially into its shell and heads from the outside in order that a small leak would develop after internal corrosion had reached a certain point internally.

The theory was that as the internal wall deteriorated, it would meet the partially drilled hole, develop a small but controlled leak, and thereby signal that the vessel wall had reached that predefined point where further operation was unsafe. Then, the boiler could be removed from service before deteriorating further and potentially exploding.

TELL TALE INSTALLED

WEAR THICKNESS SHOWN

WALL THICKNESS CORRODED

LEAK INDICATION PRODUCED

While such "tell tale" holes presented certain inherent problems, such as stopping the leak once started, they did offer perhaps the most accurate corrosion warning since it was the steel of the boiler itself deteriorating under true internal corrosion conditions. Such pre-drilled "tell tale" holes were actually the first corrosion monitoring devices patented back in the 1900's for boilers and pressure vessels . Although no longer employed, they still remain as one of the most accurate indicators for corrosion loss.

Having a predefined wearable surface, CorrView ® basically acts like the "tell tale" hole from a century ago. CorrView ® allows for a similar failure event to occur - but instead safely contains the leak within its fully sealed, high pressure sight glass. Liquid entering into its core then triggers a high visibility warning indication at its clear front viewing window.