Field Lesson #003
The Weld Was X-Rayed. The Requirement Wasn’t Met.
A completed examination and an accepted report do not establish that the required weld population was examined. Scope, selection, technique, and acceptance each need to be checked against the governing requirements.
This lesson highlights a real-world example where radiographic testing (RT) was performed, a report was generated, and the results were accepted. The issue discussed here is weld selection against the required examination scope. This account does not independently establish the technical adequacy of the radiographic technique or interpretation.
The Situation
A project required radiographic examination in accordance with the project requirements and the applicable provisions of ASME B31.3.
During fabrication, a weld was selected for radiographic testing and submitted to the NDE contractor for examination.
The Vendor’s Explanation
When the weld selection was later reviewed, the vendor explained:
“It was the first weld done, so we shot it.”
What Happened
At first glance, this may seem reasonable. The weld was radiographed, a report was generated, and the examination was accepted. However, a closer review revealed a more important issue.
The weld selected for examination was a threaded connection weld.
The contractor issued a report identifying the examined connection. A report is evidence of the recorded activity, but technical adequacy must be evaluated separately against the applicable examination requirements.
The identified scope issue was not resolved by the existence of a radiography report.
The problem was the selection of the weld.
The reported concern was that the selected threaded connection did not satisfy the project examination scope. A complete compliance finding should identify the applicable project requirement, code edition and provision where relevant, required weld population or selection method, and the actual weld examined. This is not a general statement that radiography of every threaded connection is prohibited.
The records should establish the scope mismatch without assuming the intentions of the people involved.
Looking at the Assembly
A review of the assembly showed that other welds were present that needed to be considered against the specified examination scope and selection requirements.
What the Report Made Visible
One of the most valuable aspects of this situation was the quality of the reporting.
The radiography contractor documented exactly what was examined.
The Report
The report clearly identified the examined weld as a:
“No Gap Threaded Connection”
Why Detailed Reporting Matters
Because the reporting accurately described the weld that was examined, the issue was identified during review rather than remaining hidden behind a generic acceptance report.
This is an excellent example of why detailed reporting matters.
The Real Problem
The requirement was interpreted as:
“Perform radiography on a weld.”
The Actual Requirement
In practical terms, the distinction is summarized below. This is a paraphrase, not a quotation from ASME B31.3 or the project specification:
“Perform radiography on the appropriate welds necessary to satisfy the examination requirement.”
Why the Difference Matters
Those are not the same thing.
Performing an examination activity does not automatically satisfy the intent of the specification, code requirement, or project requirement.
Understanding why a requirement exists is just as important as understanding how to perform the examination.
The Lesson
Inspection requirements should never become a box-checking exercise.
Before any examination is performed, inspectors, vendors, contractors, and NDE personnel should understand:
- What the requirement is
- Why the requirement exists
- Which welds are subject to the requirement
- How compliance will be demonstrated
- What documentation will be required
- A completed report does not necessarily mean the requirement has been satisfied.
- The purpose of inspection is not simply to collect records. The purpose is to verify compliance with the actual governing requirements, including their scope, selection rules, methods, and acceptance criteria.
Key Takeaways
- Performing NDE is not the same as satisfying a requirement.
- Weld selection matters.
- Examination requirements should be reviewed before testing begins.
- Documentation review is a critical inspection activity.
- Detailed reporting can prevent incorrect assumptions.
- Inspectors should verify the specified examination scope, selection rules, and acceptance requirements.
- Understanding the requirement is just as important as performing the examination.
Discussion
Have you encountered a situation where testing was completed, documentation was generated, and everything appeared acceptable until the underlying requirement was reviewed?
This example concerns examination scope. It does not establish the workmanship or technical adequacy of welds that were not evaluated in the account.
Understanding the difference is one of the most valuable skills an inspector can develop.