February 2003

Engineering Case Histories

Case 13: Large internal thread strip-out

Analysis helps when making the tough decisions

Sofronas, A., Consulting Engineer

Damaged threads on large 1- to 4-in.-diameter blind-tapped holes, such as found on compressor casings and vessel flanges, usually require a downtime to repair. Anyone can ask for a downtime. However, if a repair is not immediately required and the plant can be kept operating safely, shutting down could be a very expensive decision. These are the tough decisions engineers help make. This article demonstrates how a simple analysis can aid in this decision-making process.  Fig. 1  

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