hussaindawki
Materials
- Mar 27, 2025
- 4
Hey guys,
I am having today three scenarios entitling the wet h2s cracking consideration:
1- I am having a stream at HCU operating at 230 Deg C and pressure of 2200 psia, with water fraction of 0.38% but as per the heat mass balance no liquid H2O flowrate is present, so shall we consider wet H2S cracking following NACE MR0103 that it may happen at elevated temperature due to the formation of monoatomic hydrogen that will be in action during shutdowns? noting that licensor did not consider it.
2- in the same unit there is amine stripper gas, contains about 1.17xE-4 of H2S mole fraction at pressure of 2100 psia and temperature of 70 deg C, the H2O content is about 0. 1% H2O, this stream data after compressor, as per the HMB no water flow rate is present, so shall we consider also wet H2S cracking following NACE MR0103 threshold?
3- in CO2 capturing and transportation, the pipeline is in supercritical condition at pressure of 3720 psia and almost ambient temperature, the H2O is present as 0.04% and H2S partial pressure is around 2.5 psia, as per the flow assurance no water formation will happen at all cases, because the dewatering before compression maintains the water content below 0.5% H2O, so in that case shall we consider this damage mechanism or not?
Generally this case repeats many times for example in GOSPs at the gas compression section discharge to the aftercooler, usually the interconnecting piping would be free of water.
What do you think guys? It would be a great help for me to have a solid justification.
I am having today three scenarios entitling the wet h2s cracking consideration:
1- I am having a stream at HCU operating at 230 Deg C and pressure of 2200 psia, with water fraction of 0.38% but as per the heat mass balance no liquid H2O flowrate is present, so shall we consider wet H2S cracking following NACE MR0103 that it may happen at elevated temperature due to the formation of monoatomic hydrogen that will be in action during shutdowns? noting that licensor did not consider it.
2- in the same unit there is amine stripper gas, contains about 1.17xE-4 of H2S mole fraction at pressure of 2100 psia and temperature of 70 deg C, the H2O content is about 0. 1% H2O, this stream data after compressor, as per the HMB no water flow rate is present, so shall we consider also wet H2S cracking following NACE MR0103 threshold?
3- in CO2 capturing and transportation, the pipeline is in supercritical condition at pressure of 3720 psia and almost ambient temperature, the H2O is present as 0.04% and H2S partial pressure is around 2.5 psia, as per the flow assurance no water formation will happen at all cases, because the dewatering before compression maintains the water content below 0.5% H2O, so in that case shall we consider this damage mechanism or not?
Generally this case repeats many times for example in GOSPs at the gas compression section discharge to the aftercooler, usually the interconnecting piping would be free of water.
What do you think guys? It would be a great help for me to have a solid justification.
