I have a question regarding operating conditions with trace amounts of hydrogen sulfide
Thread Content
The temperature and pressure are not high (0.5 MPa, 50 degrees); there is a very low amount of hydrogen sulfide present (around a few PPm). Should Q345R be chosen or Q245R? Given these conditions, it does not fall under the category of wet hydrogen sulfide environments. If Q345R is used, is it necessary to consider HIC issues?
The wet hydrogen sulfide environment is also only a few ppm; the other conditions can be understood from that.
I think Q245R should be the preferred choice; Q345R is also an option, but there’s no need to choose a material resistant to HIC
The screenshot is taken from the SHT3193-2017 Guidelines for the Design of Equipment for Wet Hydrogen Sulfide Environments in the Petrochemical Industry. I think it’s possible to first determine whether there is liquid water present; if water is present, then it’s necessary to check whether the conditions specified in 4.2.1b) are met