BS10 is an obsolete British Standard that has largely been replaced by modern metric (PN) and international (ASME/ASA) standards, it remains in use for light-duty, economy flanges.
The pressure rating varies with temperature and the specific material, which in the original standard was often cast iron or mild steel.
The figures below are typically for mild steel or carbon steel.
Maximum Working Pressure for BS10 Table F Flanges (Steel/Cast Steel)
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