Sulfuric acid pipeline grade

Regarding the classification of sulfuric acid pipelines, in China, in accordance with the provisions of GB 50316-2014 \"Code for Construction and Acceptance of Industrial Pipeline Projects\", when the pressure of sulfuric acid pipelines is less than 0.5 MPa and the temperature is less than 80 degrees Celsius, it is considered to be in Class 1 operating conditions, and the design must meet the requirements of Grade GC1. This classification is primarily determined based on factors such as the properties of the fluid in the pipeline, as well as the operating temperature and pressure of the system. Therefore, in 2023 or at any other time, this provision will remain unchanged, unless the relevant regulations are updated or altered. .

Let me point out some issues. First, for the 2008 version of the GB50316-2000 Code for Design of Industrial Metal Piping, and the GB50235-2010 Code for Construction of Industrial Metal Piping Projects, the names and version numbers do not match; the name for the construction and acceptance codes should be that of the GB50235-1997 version! Additionally, I haven’t seen yet that sulfuric acid is specified in GC1; could you please indicate which standard and which article it refers to? Thank you very much

1 In accordance with the \"Announcement by the State Administration for Market Regulation on Matters Related to Administrative Licenses for Special Equipment\", which came into effect on June 1, 2022, the scope of the GC1 license includes: 1. Process pipelines used for transporting media specified in the \"Catalogue of Hazardous Chemicals\" that belong to acute toxicity category 1, gas media of acute toxicity category 2, and liquid media of acute toxicity category 2 whose operating temperature is higher than their standard boiling point. 2. Class A and B flammable gases, etc. 3. The pressure of the conveying medium is greater than or equal to 10.0 MPa. 2 According to the revised 2022 version of the \"Catalogue of Hazardous Chemicals\", item No. 1302 (CAS 7664-93-9) does not have the word \"toxic\" indicated in the remarks column. In accordance with 1 and 2 above, sulfuric acid pipelines do not belong to GC1. However, regulatory authorities, based on the document issued on June 1, 2022, under the \"Announcement by the State Administration for Market Regulation regarding Matters Related to Administrative Licenses for Special Equipment,\" classify it as GC1. Please share your opinions. Thank you!

According to ASME B31.3, GC1 and GC2 are classified based on the material contained within the pipeline. GC1 includes those gases or vapors that can cause combustion or explosion under normal operating conditions. GC2 includes those gases or vapors that do not cause combustion or explosion under normal operating conditions. In this case, the pressure in the pipeline is less than 0.5 MPa and the temperature is less than 80 degrees Celsius; therefore, it may belong to GC2. However, the material inside the pipeline also needs to be considered. If the pipe contains gases or vapors that can cause combustion or explosion, then it belongs to GC1. If the pipe contains gases or vapors that do not cause combustion or explosion, then it belongs to GC2.

I checked the \"Announcement by the State Administration for Market Regulation on Matters Related to Administrative Licenses for Special Equipment\", but I didn’t see that sulfuric acid falls under GC1