Ask for help from the standard or atlas of the waist-shaped flange on the top cover of the synthesis tower.
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Since the equipment maintenance and renovation are in urgent need of "waist flange" standards or atlas, I wonder if any colleagues have information in this regard and would like to help, thank you very much!
This thing is a non-standard part, there is no standard drawing book or the like. If you want, you can ask the original manufacturing unit to provide drawings or survey and draw the drawings!
The person above is right, this is a non-standard part, but your workshop should have its drawings.