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If you mean perimeter length of a 30 inch diameter circle, then it is 30*Pi or 94.248 inches (rounded to 3rd decimal).
A square with a 30-inch diagonal measurement has sides of 21.21 inches in length.
An inch is a unit of length. A millibar is a unit of pressure. The two units are therefore incompatible.
The answer depends on the length AND the cross-section of the pipe. Just one of the two measures is not enough.
Divide 30 by 8 (5+3). Multiply the answer by 3 for the one part length and 5 for the other part length.