Regarding the issue of pipeline materials in the hydrogen refining compressor area
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What is the typical material used for the pipelines in the hydrogen refining compressor area? In our plant, ordinary 20-grade steel is used; can such a material resist corrosion caused by hydrogen and hydrogen sulfide? A small crack has appeared on the flange beneath the quick-cooling hydrogen manual valve at our hybrid hydrogen valve assembly, and oil is seeping out. I would like to ask the experts why this oil leakage is occurring; after all, hydrogen should be flowing there. Neither a hydrogen detector nor a hydrogen sulfide detector can detect any issue.
Hydrogen sulfide causes stress corrosion; 20# steel has decent resistance to stress corrosion, and its price is not high. By increasing the pitting allowance, it can be used effectively； Oil is leaking from the lower flange; you can check at the outlet of the new hydrogen generator and the hydrogen circulation pump – can you see any oil there?
I didn’t dare to release it; I was wondering if it might have come from the crude oil, but with such a high hydrogen-to-oil ratio, it shouldn’t be possible, right?
Steel resistant to hydrogen corrosion should be used; treating 20# steel can work as well, though it increases costs
The environment of hydrogen and hydrogen sulfide at low temperatures is still no problem.
At low temperatures, 20# steel is capable of withstanding stress corrosion, and its price is not high； A small crack appeared on the lower flange of the quick-cooling hydrogen manual valve at the hydrogen mixing valve assembly, resulting in oil leakage; the reason is: 1. After hydrogen condenses, the C5 and C6 oils contained in the hydrogen precipitate out ； ⒉Oil flowing over from inside the reactor ； Don’t rely too much on gas detectors; trust yourself instead, go to the site more often to observe things, and nip problems in the bud.
Under low-temperature drying conditions, hydrogen sulfide hardly causes corrosion of equipment; however, hydrogen can lead to hydrogen corrosion under high pressure, but there are no problems over a period of ten or eight years.