This standard provides recommendations for the site selection, planning, layout, design, and construction of slipways used for launching and repairing vessels. It covers the main components like the trackway, cradle, and hauling machinery, outlining the necessary loads, materials, and stability checks for a safe and functional design.
Recommendations for design and construction of port and harbour components, Part 4: Slipways
Quick Reference Values
Typical slipway track gradient1 in 12 to 1 in 20
Typical hauling speed3 to 6 m/min
Coefficient of friction for launching (greased ways)0.02 to 0.04
Coefficient of friction for hauling (roller bearings)0.01 to 0.02
Key Formulas
P = W(sin α + µ cos α) — Hauling pull calculation for a vessel on a slope
Practical Notes
Geotechnical investigation is paramount for designing the foundations of the slipway track, especially the underwater sections, to prevent settlement and failure.
The choice of hauling machinery (winch) and cradle design is critical and should be based on the maximum size and weight of vessels the slipway is intended to service.
Scour protection at the toe (seaward end) of the slipway is essential to prevent undermining by wave and current action, ensuring long-term structural integrity.