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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| HG/T 21532-2014 |
Welding neck flange handholes with hinged cover 回转盖带颈对焊法兰手孔 |
China Chemical Industry
Standards Welding neck flange |
 English PDF |
| HG/T 21531-2014 |
Welding neck flange handholes 带颈对焊法兰手孔 |
China Chemical Industry
Standards Welding neck flange |
English PDF |
| HG/T 21524-2014 |
Welding neck flange manholes with davit to horizontal cover 水平吊盖带颈对焊法兰人孔 |
China Chemical Industry
Standards Welding neck flange |
English PDF |
| HG/T 21521-2014 |
Welding neck flange manholes with davit to vertical cover 垂直吊盖带颈对焊法兰人孔 |
China Chemical Industry
Standards Welding neck flange |
English PDF |
| HG/T 21518-2014 |
Welding neck flange manholes with hinged cover 回转盖带颈对焊法兰人孔 |
China Chemical Industry
Standards Welding neck flange |
English PDF |
| NB/T 47023-2012 |
Welding neck flange 长颈对焊法兰 |
China Energy industry
Standards Welding neck flange |
English PDF |
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