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Sour-Service Grade Qualifier
A well is sour once H2S partial pressure exceeds 0.05 psia (0.3 kPa), per NACE MR0175 / ISO 15156. Enter your gas data to check.
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Threshold 0.05 psia (0.3 kPa) is the NACE MR0175 / ISO 15156 sour-service boundary. Material selection at higher H2S and temperature also depends on pH and chloride — confirm with the full standard.
Send your well data for a grade check →
