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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 36489-2018 |
Flow chart of air separation plant—Graphical symbols and letter codes 空气分离设备流程图 图形符号和文字代号 |
China National Standards Graphical symbols letter |
 English PDF |
| GB/T 4270-1999 |
Graphical symbols and letter codes for thermal engineering in the technical documentation 技术文件用热工图形符号与文字代号 |
China National Standards Graphical symbols letter |
English PDF |
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