Inspectioneering Journal

Tell Tale Holes (TTH)

A Complement to Existing Piping & Fitting Inspection Practices

By Mike Badeen, Reliability Manager at Phillips 66 Co. This article appears in the May/June 1998 issue of Inspectioneering Journal.

New inspection technology, when added to the proven practice of using tell tale holes (TTHs), proves effective in reducing significant releases and or catastrophic events that are related to internal corrosion / erosion of process piping. In fact, one facility’s experience indicates that this practice, when used in conjunction with current and newly advanced technology such as automated ultrasonic (AUT) and profile radiograph (PRT), is more effective than using only new technology.

“Building upon success is critical to the continued improvement process”. Companies need to carefully evaluate changes to be sure and not discontinue “proven” practices when adopting newer technologies until the new methods are proven as equally effective. Similar to insurance, “you would not want to drop your policy until you were able to replace it with one of adequate value”.

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