The classification of pressure pipelines
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The pressure pipeline for transporting liquid alkali (diameter 65, design pressure 0.45) – is this of GC2 or GC3 grade? Thank you
GC2 level, classified as a toxic medium
Personally, I infer as follows: First, according to the conditions specified in GB/T20801.1-1.3.1, this pipeline meets the criteria of having a working pressure greater than 0.1 MPa and being corrosive, thus it falls under the category of pressure pipelines. Secondly, according to Article 4, GC1 and GC2 are excluded; it belongs to GC3.
Alkaline solutions represent a low level of hazard; they cannot be classified as GC3, but rather as GC2
The key is the toxicity level; check the occupational toxicity standards