Polar moment of inertia

Input(s)

$J_{b}$: Polar Moment of Inertia of Pipe Body $\left(\mathrm{ft}^{4}\right)$

$J_{j}$: Polar Moment of Inertia of Tool Joint $\left(\mathrm{ft}^{4}\right)$

L: Length of Pipe $(\mathrm{ft})$

1: Joint Tool Length (ft)

Output(s)

$J_{p}$: Polar Moment of Inertia of Pipe $\left(\mathrm{ft}^{4}\right)$

Formula(s)

$$ J_{p}=\frac{J_{b} * J_{j}}{\left(\frac{L-l}{L}\right) * J_{j} *\left(\frac{l}{L}\right) * J_{b}} $$

Reference(s)

Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 356.