Corrosion Failure Analysis of the Vacuum Tower at the LVC Draw Piping Line
Bibliographic record
Abstract
Abstract The corrosion failure of the Light Vacuum Condensate (LVC) draw piping line in a vacuum tower was investigated to identify the damage mechanism. The failure was localized at the LVC draw elbow near the tower's draw nozzle, with significant corrosion observed in the outlet straight piping up to the first elbow. Visual Inspection and RT inspection showed a corrosion damage morphology named “wolverine claws”. Metallurgical analysis revealed smooth pits and grooves, with corrosion products consisting of iron sulfides, and other oxides containing chlorides. The study explored the potential role of nitrogen-based compounds, particularly amine-hydrochloride oil-soluble salts formed from the interaction of crude feed nitrogen and amine-based chemical injections, as key contributors to the corrosion process. These salts, trapped in the LVC circuit, can enhance and accelerate organic corrosion, especially at lower temperatures (<400F) where Naphthenic Acid Corrosion is not expected. The paper explores possible sources of chloride in the LVC system and describes the morphology of the damage mechanisms
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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 | 0.001 |
| 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) | 0.001 | 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".