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 .