Recommendations for material selection resistant to hydrogen chloride corrosion
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I would like to ask the experts: given 100% hydrogen chloride, an operating temperature of 140°C, and the possibility of localized water presence, what type of material would be most resistant to corrosion in such conditions? We are currently using fittings with Teflon linings, but over time, hydrochloric acid gas can seep out through the pores, requiring the system to be shut down for the fittings to be replaced. There are no suitable materials in the online or self-collected corrosion-related data; I hope to get some clarification with everyone’s help. Thank you for helping
CPVC pipes can be considered; they are corrosion-resistant and have high strength
Thank you for your valuable feedback. I searched online and found that the maximum temperature tolerance for CPVC pipes is 100 degrees, while our operating temperature reaches 140 degrees... so it’s not possible to use such pipes. Nevertheless, I appreciate your suggestion very much
Graphite pipes or steel-lined graphite pipes can be used.
Both PTFE lining and glass lining can meet these operating conditions.
Are the fluoroplastic pipes currently in use lined with pine, or are they molded? If they are molded pipes, there should be no leakage
To be honest, we really don’t understand the manufacturing process of the lining pipes we purchase. If I have to explain it, our external pipes are made of carbon steel, and carbon steel pipes have so-called \"vent holes.\" Over time, hydrogen chloride or the process fluids used will start to leak through these vent holes. ------------------------------------------------------------------ Thank you all for sharing your valuable opinions; I’ll discuss this with our maintenance team
PTFE has relatively poor impermeability.
It is recommended to use ETFE or PVDF lining instead. Its resistance to permeation is better than that of PTFE. Additionally, pipes made of ceramics, glass, etc., can also be considered if conditions permit.
Internal glass-lined pipes are quite good; our company uses them in this way
100% HCl gas has very weak corrosivity; there are many materials that can be used for it, such as carbon steel and stainless steel. Why is there water in some areas? I think the focus should be here – water can solve many problems!