In early 2021, Filtersafe announced it was changing the specification of the stainless steel used in its filters. A newly released whitepaper explains the thinking behind the change
In February 2021, Filtersafe, a manufacturer and supplier of a popular brand of filters in the ballast water treatment sector, announced the removal of 316L grade stainless steel from its supply chain and that production is switching to 904L grade stainless steel.
The change in the stainless steel specification was driven by feedback and research into corrosion. Seawater contains chlorides which promote corrosion. Incorrect drying of filters after ballast water treatment operations can produce biofilm, resulting in microbiologically induced corrosion.
In addition, the nature of ballast water operations means the ballast water tanks are often in a half-full state which promotes corrosion zones in the tanks and filters.
Furthermore, seawater and ballast water from port to port are not uniform in composition, resulting in the specification of the materials used needing a wide range of resistance to corrosion.
Filtersafe has produced a whitepaper Overcoming corrosion of stainless steel screens in seawater applications, which has been endorsed by Dr Alec Groysman, who said “After working with stainless steel for almost five decades, I can say with confidence that the poor man pays twice…This is why I support Filtersafe’s decision to switch from 316L to 904L.”
The whitepaper can be downloaded here.
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