Derrick efficiency factor
Input(s)
E: Power Efficiency (per cent)
\(n\): Number of Lines strung between crown block and travelling block (dimensionless)
Output(s)
\(E_{d}\): Derrick Efficiency Factor (per cent)
Formula(s)
\[
E_{d}=\frac{\left(\frac{1+E+E n}{E n}\right) W}{\left(\frac{n+4}{n}\right) W}
\]
Reference(s)
Bourgoyne, A. T., Millheim, K. K., Chenevert, M. E., & Young, F. S. (1986). Applied Drilling Engineering, Page: 10 .