What is the scope and priority of various standards?
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Dear experts, what is the priority order for using various standards in your engineering applications? For example, must industry standards comply with national standards, and when should foreign standards be used? ——National standards GB, petrochemical standards SH, oil and gas industry standards SY, chemical industry standards HG, and foreign standards. Thank you!
The national standard is the basic standard, that is, what is commonly referred to as the minimum requirement. The requirements of industry standards shall not be lower than those of national standards.
Oh. Too focused on foreign standards – can it be understood this way: foreign standards are followed, and when they do not conflict with domestic conditions, stricter requirements are applied; therefore, in most cases, they can be directly used as a reference ； Or, when there are no national standards, can foreign standards be followed?