Pipe Fishmouth Total Circumference / Weld Inches

[350z]

Hi all,

How can I determine the total circumference of weld for joining a fishmouth pipe to a larger main? Obviously, the formula for circumference is pi multiplied by the diameter; However, this doesn't account for each arc length within the saddle like shape as the weld isn't a perfect or 2D circle. Attempting to calculate exact length of weld for reporting / accurate labor tracking. If anyone knows the formula(s) I can apply to achieve this, please let me know.

Many thanks!!! 

[JMStoesz]

I haven't figured this out either, but I simply report the number of saddle welds (by counting that part for each one) and their weld diameter sizes. This way we at least have them accounted for.