![]() The maximum yield strength for each grade shall be no more than 103 MPa (15 ksi) higher than the SMYS. 2 Tubulars and tubular components made of Cr-Mo low alloy steels (UNS G41XX0, formerly AISI 41XX, and modifications), if quenched and tempered in the tubular form, are acceptable if their hardness does not exceed 30 HRC and they have SMYS grades of 690 MPa (100 ksi), 720 MPa (105 ksi), and 760 MPa (110 ksi). ![]() ![]() c) Calculate the partial pressure of H2S in the gas at the bubble point from the following formula: pH2 S = pB × x H 2 S 100 where pH S is the partial pressure H2S, expressed in MPa (psi) 2 pB 34 is the bubble-point pressure, expressed in MPa (psi) © NACE/ANSI/ISO - All rights reserved NACE MR0175/ISO 15156-2:2003(E) xH S is the mole fraction of H2S in the gas, expressed in %.Įven if pH S is below 0,3 kPa (0,05 psi)]. b) Determine the mole fraction of H2S in the gas phase at bubble-point conditions by any suitable method. NOTE For a liquid-full pipeline downstream of gas separation units, a good approximation for bubble-point pressure is the total pressure of the last gas separator.
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