Consensus on Best Tube Sampling Practices for Boilers & Nonnuclear Steam Generators (CRTD 103)
2 Tube Sampling Following Tube Failures
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If a tube has failed and is being removed for failure analysis, both the failed tube and an adjacent tube should be collected. When a tube fails, much of the internal deposit may be dislodged from the surface eliminating evidence that would indicate whether internal surface deposition contributed to the failure. Additional information and general procedures for tube sample removal and shipping are provided in the Tube Sample Removal, Identification and Shipping section.