Introduction
There are several ultrasonic smart pigging providers that supply fired heater tubing inspection services to the refining and chemical industries. Although all claim the ability to detect wall thinning and tube deformations to some degree, the inspection surface coverage, resolution, minimum wall thickness detection and reporting capabilities may vary drastically from one service provider to the next. Knowing your provider’s capabilities is crucial for ensuring the integrity of your assets, as one refinery recently discovered.

Figure 1. Smart Pig Navigating.
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