Design standards for new sulfuric acid plants
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According to GB230-1010 and Appendix A.0.1 of HG/T 20660-2017, \"Classification Standards for Toxicity Hazards and Explosion Risks of Chemical Media in Pressure Vessels\", sulfuric acid is classified as a highly hazardous medium, while sulfur dioxide and sulfur trioxide are classified as highly hazardous media as well； 1. According to this standard, if the hazard level is not to be reduced, how should sulfuric acid be designed using different processes, and by how much will the costs increase? I hope experts can provide valuable suggestions. 2. Do all newly installed devices reduce their hazard level?
It should still be designed according to the original hazard level classification for media, without the need to follow GB230-1010 or HG/T 20660-2017. For pressure pipelines, Note 1 of Announcement No. 3 of 2019 issued by the State Administration for Market Regulation specifies the hazard level of media according to the \"Catalogue of Hazardous Chemicals (2015 edition)\"; sulfuric acid does not belong to the category of liquid media with acute toxicity of Class 1. Therefore, the pressure pipeline classification does not need to be upgraded. For pressure vessels, the classification levels of medium hazard severity under TSG 21-2016 and GB 150 are still based on HG/T 20660-2000; HG/T 20660-2017 has not yet been put into effect, so there is no need to upgrade their categories either.
HG/T 20696-2018 \"Technical Specifications for Chemical Equipment Made of Fiber-Reinforced Plastics\" and SH/T 3161-2011 \"Technical Specifications for Non-Metallic Pipes in the Petrochemical Industry\" are not applicable to extremely hazardous or highly hazardous media. What guidelines should be used for the design of containers for sulfur dioxide-containing flue gases, fiberglass-reinforced plastic pipes, etc.?
For non-metallic external equipment and pipelines that fall outside the scope of application of the Supervision Regulations or the Licensing Rules, it is recommended to design them in accordance with the technical specifications for such non-metallic equipment or pipelines. Use it flexibly – the fuel gas used in household stoves is also a flammable and explosive substance, and rubber hoses are still used for connecting the pipes in such cases, right?