Does anyone know the history here for typical small pipes, such as 1/4 inch IPS to 2 inch IPS? Why was 1/2 IPS pipe made 0.840 outside diameter?, what was the logic for developing "Schedule" pipe, what was the origin of "Schedule 40 pipe, Schedule 80, etc?
History questions that have not had answers for me, although searching for many years. Thanks in advance for any info.
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