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Oil And Gas Pressure Vessel Sour Service NACE MR0175 And Separator Design An oil and gas pressure vessel works in one of the harshest duty families - it separates, scrubs, accumulates or treats hydrocarbons, often with hydrogen sulphide (H2S) present and at pressures far above a plant-air receiver. The defining specification issue is sour service: when H2S is present, material hardness and grade are constrained by NACE MR0175 / ISO 15156 to resist sulphide-stress cracking,