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When can NDT be deemed unnecessary during boiler inspections?

  1. When there are no visible issues

  2. When the inspector concludes it is not required

  3. Only on newer models

  4. NDT is always necessary

The correct answer is: When there are no visible issues

In boiler inspections, non-destructive testing (NDT) can be deemed unnecessary when there are no visible issues that suggest any structural integrity concerns. If the inspector conducts a thorough visual examination and finds no signs of wear, corrosion, cracks, or other damage, they may determine that NDT is not needed at that time. This approach allows for a more efficient inspection process when the condition of the boiler appears satisfactory. The reasoning behind the other options stems from standard practices: inspectors may not arbitrarily conclude that NDT is not required without a proper assessment, and while newer models may sometimes exhibit fewer issues, they still require inspections to confirm their integrity. The notion that NDT is always necessary does not hold in cases where visual inspections reveal no concerns. Thus, determining that no visible issues exist is a valid basis for deeming NDT unnecessary.