| Result | Value | Unit / Basis |
|---|---|---|
| Absolute pressure | — | bar(a) |
| CO₂ partial pressure | — | bar |
| CO₂ partial pressure | — | psi |
| H₂S partial pressure | — | bar |
| H₂S partial pressure | — | psi |
| Material family | — | Guideline chart |
| Suggested grade / option | — | — |
Use the supplied chart as the screening reference. The chart image below is the latest guideline provided for this form.
Partial pressure calculation: The entered pressure is psig. The calculator converts it to absolute pressure by adding 14.6959 psi, then calculates gas partial pressures using the entered CO₂ mol% and H₂S ppm.
Chart thresholds: CO₂ branches at 0.2 bar (20 kPa); the higher-CO₂ branch uses H₂S thresholds of 0.1, 0.03 and 0.003 bar with temperature limits shown in the chart. The lower-CO₂ branch distinguishes H₂S above or at/below 0.003 bar.
Other chemistry: Chloride, bicarbonate and pH are retained as input fields from the original form, but the supplied chart does not use them to select a grade. They are not included in the selection logic here.
Important: This is preliminary screening against the supplied chart, not a final material qualification. Confirm the exact grade, applicable notes, corrosion mechanism, standards, and project specifications with the materials/corrosion engineer. Where the chart lists alternatives without a selection rule, both are shown.
