May non-metallic pipes be used for Class A liquid pipelines? ? What are the criteria that prohibit it?
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1/ May non-metallic pipes be used for Class A liquid pipelines? ? What are the criteria that prohibit it? 2/ May steel-lined non-metallic pipes be used for Class A liquid pipelines? ? What are the criteria that prohibit it?
Any of them can be used; there is no standard specifying that a certain material cannot be used. Nowadays, non-metallic materials are often used for buried pipelines. If Category A media contain corrosive substances, steel pipes are not suitable; instead, corrosion-resistant non-metallic pipes or pipes lined with plastic can be used
There is no absolute ban; it depends on how you use it, and a hazard analysis is required； You can’t generalize and judge everyone the same way.
Personally, I think it’s not possible; it’s too easy to damage. Carbon steel pipes of poor quality are not acceptable, and non-metallic materials probably are not either.
Personally, I think it can be used, but the issue of static discharge must be carefully considered
5.1.10 The process equipment itself (excluding linings) and its foundations, as well as pipes (excluding linings) along with their supports, hangers, and foundations; the insulation materials for such equipment and pipes shall be non-combustible. (Gb51283) Non-metallic pipes are generally made of flame-retardant materials. You also need to consider anti-static measures
Static discharge needs to be considered for Class A liquid pipelines.
\"Technical Specifications for Non-metallic Piping in Petrochemical Industries\" SH/T3161-2011 4.1.7 Non-metallic piping shall not be used for media that are flammable, highly toxic, or extremely hazardous.