Which material is commonly chosen for mooring lines in surge-prone environments?

• A. Nylon
• B. Polyester
• C. Aramid
• D. Polypropylene

Answer: (A)

In surge-prone environments, you want mooring lines that can absorb shock by stretching, so peak tensions on the vessel and mooring hardware are reduced. Nylon is best here because it has high elongation and excellent energy-absorbing (shock-damping) properties. When wave-induced surge loads come, nylon lines stretch significantly before failing, dissipating energy and lowering peak forces on cleats, bollards, and anchors.

Polyester, while resistant to UV and creep, stretches much less, so it doesn’t dampen surge as effectively. Aramid has very low stretch and high strength, which is great for static loads but poor for absorbing shock. Polypropylene floats and is lighter, but it offers lower strength and durability under shock loads, making it less suitable for surge-heavy moorings.