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Nace Applicability Criterion For Liquid Streams
#1
Posted 10 October 2018 - 08:30 AM
#2
Posted 12 October 2018 - 11:04 PM
The NACE method means you need the composition of H2S in the bubble point vapour. So instead of your equation, it should be pH2S = pB * yH2S, where yH2S is the mole fraction of H2S in the vapour phase that forms at bubble point. Using a simulator, setting the vapour fraction to 0.001 will generate a small vapour fraction with an accurate composition. The simulator will handle both the H2S evolution from the oil and water phases. If you don't have a simulation, the vapour composition in the last separator could be used. This method uses the partial pressure in the vapour phase as a proxy for the sulfide ion concentration in the liquid (which is what really matters to the corrosion and cracking mechanisms).
If you look in the other NACE standard (MR0103 - ISO17945), you will also find some other criteria for liquid systems, ppmw of H2S in the aqueous phase, ppmw cyanide and pH that could lead to sulfide stress cracking.
Edited by Technical Bard, 12 October 2018 - 11:06 PM.
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