What material should be used for hydrogen chloride pipelines?
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According to SH/T 3161-2021, Technical Specifications for Non-metallic Piping in Petrochemical Industries, non-metallic piping shall not be used for transporting flammable media or those with an extremely high or high level of toxicity； According to HT/T20660-2017, hydrogen chloride (hydrochloric acid) is classified as a highly hazardous substance; therefore, the materials used for hydrogen chloride pipelines cannot be fiberglass, polypropylene, polyethylene, or polyvinylidene fluoride – only steel-lined materials can be used, such as steel-lined PTFE or steel-lined glass.
Everyone is welcome to discuss this; according to this requirement, can fiberglass storage tanks still be used to store hydrochloric acid?
We are a PVC factory that uses pure hydrogen chloride, with water content at the PPM level, and carbon steel pipes. Hydrogen chloride, when free of water, is non-corrosive. .
There’s no point in looking at this standard; hydrogen chloride, chlorine, and hydrogen sulfide are placed in the same category, which shows that it’s not reliable； There have been many fatal accidents caused by hydrogen sulfide and chlorine leaks, but I have never seen any deaths resulting from hydrogen chloride leaks.
According to SH/T 3161-2021, Technical Specifications for Non-metallic Piping in Petrochemical Industries, non-metallic piping shall not be used for transporting flammable media or those with an extremely high or high level of toxicity； According to HT/T20660-2017, hydrogen chloride (hydrochloric acid) is classified as a highly hazardous substance; therefore, the materials used for hydrogen chloride pipelines cannot be fiberglass, polypropylene, polyethylene, or polyvinylidene fluoride – only steel-lined materials can be used, such as steel-lined PTFE or steel-lined glass. Can fiberglass pipelines still be used to transport hydrogen chloride gas? We welcome discussions on this topic.
The moisture content in hydrogen chloride is crucial for determining the material suitable for use in transportation pipelines; carbon steel pipes are generally used, and it is important that the moisture level does not exceed specified limits； The hydrogen chloride gas generated during the chlorination process, due to the presence of impurities and moisture, is usually handled using steel lined with plastic (or adhesive); fiberglass pipes are also used in some cases.
This is a pipeline specification; it should not be applied to storage tanks. Is it hydrogen chloride or hydrochloric acid – one is a gas and the other a liquid, or are they different?
Hello, the original poster: do you have an electronic version of the SH/T 3161-2021 standard? Can you share it? Thank you! ! !
Under the stricter regulations, flammable materials are no longer allowed to be used for process equipment, pipelines, etc. in renovations and expansions; steel lining is required instead