Comparison of Fender Dimensions, PIANC WG211, and PIANC WG33

PIANC WG211 updated marine fender system design guidelines, shifting from a global safety factor to partial safety factors based on statistical data, fender manufacturers’ data, and adjustments for uncertainties in berthing energy calculations. This paper compares the outcomes of the old PIANC WG33 and the new PIANC WG211 guidelines using data from actual project fender design specifications. Given similar input variables, the new WG211 guideline generally results in marginally smaller fenders. The updated design approach provides reasonable fender dimensions when local conditions and navigation factors are considered, and fender dimensions can be optimized through parametric analysis of the fender pitch. However, WG211 recommends higher berthing velocities for large seagoing vessels compared to Brolsma’s berthing velocity curves in PIANC WG33, potentially leading to larger fenders in the absence of site-specific information. Local experience and input from asset owners are crucial for ensuring appropriate safety levels.