API 5L mass per unit length

[Saman2002]

I have access to API 5L 46th edition, section 9.11.2 mentioned the calculation for mass per unit length to be: mass for 1m=Wall thickness x (I.D.) x 0.02466. but the results of this formula is lighter than calculating the weight by density (considering the density to be 7850 k/m3).
what is the reason for this difference?

 

[Geoff13]

Why do you think these numbers don't match?

(7850 kg/m³) / (1000 mm/m) / (1000 mm/m) * Pi = 0.02466

 

[LittleInch]

Also its not t x ID x C, It is t x (D-t) x C, which is the mid wall thickness.

ID is (D -2t)

Read the document a bit better....

Also its easier to use ASME B 36.10 which gives you the data without needing to calculate it. I just checked a sample one and it works perfectly.

 

[Vegas Consulting]

I have access to API 5L 46th edition, section 9.11.2 mentioned the calculation for mass per unit length to be: mass for 1m=Wall thickness x (I.D.) x 0.02466. but the results of this formula is lighter than calculating the weight by density (considering the density to be 7850 k/m3).
what is the reason for this difference?

The difference arises because the API 5L formula includes a standardized conversion factor (0.02466) that accounts for manufacturing tolerances, pipe ovality, and other factors. In contrast, calculating weight using density (7850 kg/m³) assumes an ideal solid material without considering these variations.