Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
DETERMINATION OF THE REMOTION PERCENTAGE OF BARNACLE BIOFOULING FROM MARINE STEEL PLATES USING STEEL BRUSH FOR CLEANING
Submission Author:
Rodrigo Guedes , MG
Co-Authors:
Rodrigo Guedes, Vinícius Teles, Paulo Henrique Vieira Magalhães, Ana Letícia Pilz de Castro, Danilo Lisboa, Luana Carmo , Philip Pritzelwitz
Presenter: Vinícius Teles
doi://10.26678/ABCM.COBEM2021.COB2021-0975
Abstract
Barnacles are fouling crustaceans with hard substrate that can be natural (reefs) or artificial (vessel decks). Barnacle encrustation in ships has been frequently reported as one of the main causes of the increase in drag force between the hull and the water. To preserve the hull and lower the energetic expense, it is common and obligatory the periodic cleaning of hulls. There are several barnacle cleaning methods, such as manual or mechanical cleanliness, and because of the difference between them, each one have its own applications and particularities. This work has as an objective to identify if the tool steel brush is efficient to efficiently perform the fouling cleanliness. Plates of naval carbon steel (ASTM 131) with the dimensions of 200 x 250 x 3 mm submitted to a commercial scheme for hoof painting. Subsequently, the fouling was set to grow in 29 plates in the marine environment. The fouling occurred in the piers of the Hydrography and Navegation Directory (HND), located in the Guanabara Bay (Niterói, RJ, Brazil). With the intention to evaluate the efficiency of the brush at different fouling stages, every 30 days, 7 plates were removed, totaling 131 days of submergence. After these panels were removed, they were all moved to the laboratory, where they were tested at 5 different rotary speeds, 560 rpm, 899rpm, 1050 rpm, 1350 and 1765 rpm. From these tests the percentage of cleanliness, the percentage of paint stripping and the percentage of remaining fouling after the cleaning. The results show that, by making a qualitative and visual analysis, the steel brush was efficient, removing a great deal of the fouling of the area where the tool acted. The overall cleaning efficiecy was 71,77%. At the speed of 899rpm the cleaning efficiency was 91,90%.
Keywords
biofouling cleaning, drag force, steel brush, barnacles biofouling, energetic expense, Fuel consuptiom, ship hull cleaning
