Crack Detection of Hydrocracker Feed/Effluent Heat Exchanger Tubes
Bibliographic record
Abstract
Abstract Non-ferromagnetic heat exchanger tubes are typically inspected using conventional eddy current bobbin probes to gather data on the integrity of the tubes. This technique provides operators with useful information on pitting and longitudinal cracks, but technical limitations of the conventional eddy current process leaves operators with limited ability to detect circumferential flaws and cracks. In this paper, extensive circumferential chloride stress corrosion cracks, originating from the tube outside diameter, were found by Eddy Current Array (ECA) in the front portion of SA 213 TP 321 SS tubes of a hydrocracker unit feed-effluent heat exchanger. The crevices between the tubes and the tube sheet trap chlorides in both normal operation, and in downtime. Deployment of ECA technology eliminates the limitations of conventional EC bobbin coil probes, effectively identifying circumferential cracking as well as pitting and axial cracking.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".