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Biofouling growth study in offshore mooring ropes
Ana Lúcia Nazareth da Silva1, Luciana Vicente Resende de Messano2, Daniel Magalhães da Cruz3
1Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil; Programa de Engenharia Ambiental, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
Marine biofouling on synthetic mooring ropes (PET) showed typical ecological succession over 12 months. These ropes resist biofouling and corrosion better than steel, offering durability insights for offshore engineering.
Area of Science:
- Marine Biology
- Materials Science
- Offshore Engineering
Background:
- Marine biofouling presents significant challenges for offshore engineering structures.
- Synthetic mooring ropes, specifically high-tenacity polyester (PET), are increasingly used in offshore applications.
- Understanding biofouling on these synthetic materials is crucial for predicting their long-term performance and durability.
Purpose of the Study:
- To experimentally investigate marine biofouling growth on synthetic mooring rope segments (PET).
- To assess the biofouling resistance and structural integrity of PET ropes over a 12-month submersion period.
- To compare the biofouling performance of synthetic ropes with conventional steel catenary systems.
Main Methods:
- Submerging PET synthetic mooring rope segments for 12 months at an offshore proving ground in Brazil.
- Monitoring ecological succession patterns and species composition of marine organisms colonizing the ropes.
- Analyzing rope surface coverage, inner region colonization, and structural integrity post-submersion.
Main Results:
- Ecological succession stabilized by month six, with surface coverage reaching equilibrium by month nine.
- Colonization was dominated by soft-fouling organisms; inner rope regions showed minimal continuous fouling.
- No significant structural degradation or damage was observed; PET ropes demonstrated higher biofouling resistance than steel systems.
Conclusions:
- Synthetic mooring ropes (PET) exhibit good resistance to marine biofouling in tropical environments.
- The observed biofouling patterns suggest localized permeability but no critical structural compromise.
- PET ropes offer a durable, corrosion-resistant alternative to steel systems for offshore mooring applications.
