DIN 28139-2 PDF
Welding necks for glass lined vessels – Part 2: Form M manhole, handhole and assembly opening for clamp screw connections – Connecting dimensions
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Welding necks for glass lined vessels – Part 2: Form M manhole, handhole and assembly opening for clamp screw connections – Connecting dimensions
Deutsches Institut Fur Normung E.V. (German National Standard) , 05/01/2019
DIN 28139-2 PDF
Welding necks for glass lined vessels – Part 2: Form M manhole, handhole and assembly opening for clamp screw connections – Connecting dimensions