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research-article

Tensile Strength of Nylon Netting Subjected to Various Concentrations of Disinfecting Chemicals

[+] Author and Article Information
Heidi Moe F⊘re

SINTEF Ocean, Department of Seafood Technology, Postboks 4762 Torgard, 7465 Trondheim, Norway
heidi.moe.fore@sintef.no

Stine Wiborg Dahle

SINTEF Ocean, Department of Environment and New Resources, Postboks 4762 Torgard, 7465 Trondheim, Norway
stine.wiborg.dahle@sintef.no

Rune Harald Gaarder

SINTEF Idustry, Department of Materials and Nanotechnology, P.O.Box 124 Blindern, 0314 Oslo, Norway
rune.h.gaarder@sintef.no

1Corresponding author.

ASME doi:10.1115/1.4040562 History: Received October 24, 2017; Revised May 28, 2018

Abstract

This paper presents a study of traditional netting materials subjected to disinfecting chemicals during fish farming and treatment of net cages. A series of tests were performed in order to study the effect of various concentrations of disinfecting chemicals on the tensile strength of Raschel knitted Nylon netting materials. Simulated spill of diluted hydrogen peroxide to the jump fence during de-lousing did not affect the strength of the applied new and used knotless nylon netting samples. Hydrogen peroxide reacted with biofouling forming gas bubbles, but this did not result in reduced netting strength. The performed tests did not indicate any effect on netting strength from a simulated single, traditional bath disinfection as performed at service stations applying the disinfectant Aqua Des containing peracetic acid. However, increasing the Aqua Des concentration from 1 to 10 % resulted in a strength reduction of 3-6 %. Simulated spill of concentrated Aqua Des on the jump fence of a net with copper coating residuals resulted in a severe reduction in strength of 45 %. This strength loss was probably a consequence of chemical reaction between copper and Aqua Des, and uncoated netting did not experience any loss in strength subjected to the same chemical exposure. These findings from application of Aqua Des should also apply to other peracetic acid disinfection chemicals with trade names as for example Perfectoxid and Addi Aqua.

Copyright (c) 2018 by ASME; use license CC-BY 4.0
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