80” 150# Flange Standard
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Is there a standard 80” 150# flange?
It seems not; the maximum diameter is around 24” (DN1500). However, for this pressure class, there are 80” versions with PN16 specifications, as specified in GB/T9112-9124. For large-diameter standards based on American norms, refer to GB/T13402, but the maximum diameter there is also 1500. Additionally, the new versions of GB/T13402 and GB/T9112-9124 are currently under approval process, so it’s possible that such specifications will become available soon. If an 80” 150# size is required, check the latest version of ASME B16.47 to see if it is available.
It’s not easy to find. HG’s standards cover only up to DN1500; the 80-inch version you have uses a DN2000 flange, and it’s likely not commonly used, so there’s no standard set for it