Sour Gas 2
Sour Gas 2 : Materials shall be selected to be resistant to sulfide stress cracking or the environment should be controlled if the gas being handled is at a total pressure of 65 psia (448 Mpa) or greater and if the partial pressure of hydrogen sulfide in the gas is greater than 0.05 psi (0.34 Kpa). Systems operating below 65 psia total pressure or below 0.05 psia hydrogen sulfide partial pressure are outside the scope of this Standard. Partial pressure is determined by multiplying the mol fraction (mol percent divided by 100) of hydrogen sulfide in the gas by the total system pressure. Figure C.1 provides a convenient means of determining whether the partial pressure of hydrogen sulfide in a sour environment exceeds 0.05 psia. Examples: (1) partial pressure of hydrogen sulfide in a system containing 0.01 mol percent hydrogen sulfide (100 ppm or 6.7 grains per 100 SCF) at a total pressure of 1000 psia exceeds 0.05 psia (Point A on Figure C.1), and (2) partial pressure of hydrogen sulfide in a system containing 0.005 mol percent hydrogen sulfide (50 ppm or 3.3 grains per SCF) at a total pressure of 200 psia does not exceed 0.05 psia (Point B on Figure C.1)
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