Steel pipe weight tables look like data: 52 nominal sizes from 1/8" to 108", up to 17 schedules each,

405 rows with outside diameter, wall thickness and weight per foot and per metre (ASME B36.10M / B36.19M

values, as tabulated in Wikipedia's "Nominal Pipe Size" article). I keep them as JSON

for a weight calculator, and I wanted a test that every row is right, not just "close enough".

A pipe is a ring, so the weight should follow from two numbers. The question was whether all of the

table follows from them, to the last printed digit. It does, but only once you use the same constants,

and the same starting dimensions, as the people who made the table.

The formula

The cross-section of a pipe with outside diameter D and wall t is

A = π/4 × (D² − (D − 2t)²) = π × (D − t) × t

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Weight per length is area × density.…