Determining the medium in pressure pipelines – How to identify toxic and corrosive liquids?
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As is well known, pressure pipelines must meet three conditions: The pressure requirement – the maximum operating pressure must be greater than or equal to 0.1 MPa (G)； Requirements for physical properties: gases, liquefied gases, vapors, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point ； Requirement regarding size: Pipes with a nominal diameter of 50 mm or greater. Among them, which regulatory standards are used as the basis for determining toxic and corrosive liquids? Is there any official interpretation? For example, is circulating water considered a toxic liquid? Of course, it contains many additives that can be classified as toxic liquids; is there any concrete evidence for this?
It is based on the pipe color codes and symbols, for reference only.
HGT 20660-2017 Classification Standards for Toxic Hazards and Explosion Risks of Chemical Media in Pressure Vessels
GBZ230-2010 Classification of the Hazard Level of Occupational Exposure to Toxic Substances – This standard should be referred to, right? Previously, GB5044 was used for reference, but that standard was later repealed