Corrosive questions
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“In TSG_D0001-2009 \"Regulations on Safety Supervision of Pressure Piping – Industrial Piping\", the classification of industrial piping according to its level, as well as the toxicity, corrosivity, and fire hazard of the fluids it carries is specified in Section A2.3 Corrosivity. Corrosive fluids in pressure piping refer to those that cause visible necrosis upon contact with the skin within 4 hours, or those that exhibit a corrosion rate of more than 6.25 mm/year on 20 steel (defined as steel or aluminum in GB30000) at 55°C. 1. “Visible necrosis occurs within 4 hours upon skin contact” – is this 4-hour period the contact time? Or does visible necrosis appear within 4 hours after contact? How to use it in conjunction with \"GB 30000.19-2013 Standards for the Classification and Labelling of Chemicals – Part 19: Skin Corrosion and Irritation\"? 2. Fluids at 55°C that cause a corrosion rate of more than 6.25 mm/year for 20 steel (designated as steel or aluminum in GB30000) . In which specifications or documents are these fluids specified?
1. “Visible necrosis occurs within 4 hours upon contact with the skin” refers to the severe damage that can be caused by a chemical substance in a short period of time (within 4 hours) after it comes into contact with the skin. The “4h” here usually refers to the contact time, that is, visible necrosis can occur within 4 hours of skin contact with the corrosive substance. This complements \"GB 30000.19-2013 Specifications for the classification and labeling of chemicals – Part 19: Skin corrosion/irritation.\" In GB 30000.19-2013, there are regulations for classifying and labeling chemicals based on their corrosive or irritating effects on the skin, in order to ensure proper handling and use of such chemicals and thus protect the safety of users. 2. Information regarding fluids that exhibit a high corrosion rate on 20 steel or steel-aluminum materials at 55°C may be specified in various industry standards and regulations. For example, the detailed classification and properties of corrosive substances may be described in the standards of the chemical, oil, and gas industries. Additionally, data on the corrosivity of specific chemicals can usually be found in the Material Safety Data Sheet (MSDS) or the Chemical Safety Data Sheet (SDS). These data sheets provide important information about chemicals, including their corrosivity to specific materials. In China, the relevant regulations and guidelines may be included in the standards or guidelines issued by the **State Administration for Work Safety, such as the Regulations on the Safety Management of Hazardous Chemicals and related specific standards. If information on the corrosion rate of a specific fluid is needed, one can refer to the technical specifications provided by the fluid’s manufacturer or contact relevant industry associations for more detailed data. .