Last August, a new and really useful norm has been published to better understand the “corrosive sulfur problem”; it is IEC 62697 ed.1 entitled “Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids”.
Particularly enlightening is the introduction of the standard (downloadable for the IEC website), in which, for the first time in the normative field, the DBDS is mentioned among the additives. The introduction emphasises the complexity of the “corrosive sulfur problem” underlining the limits of empirical tests clarifying that besides DBDS there are other sulfurised compounds, used as additives, which are responsible for phenomena of failures due to corrosive sulfur, widely documented.
The first part of norm IEC 62697 deepens the technical determination of DBDS, whereas the second part of the norm shall deal with the technique for the quantitative determination of TCS (Total Corrosive Sulfur).
In this field, indeed, Sea Marconi has been once again a pioneer, being the first to develop a solution: the kit SM-TCS, which is at last able to quantify numerically (quantitative determination) the contamination by total corrosive sulfur in the oils. Sea Marconi, not only matured the idea, but was able to materialise it by creating a simple, effective and precise product, already validated by round robin laboratory tests.
Sea Marconi fully responds to the prescriptions of the technical norms, anticipating them with effective and innovative solutions; we remind, once again, that Sea Marconi was the first in 2005 to discover the DBDS as the main responsible for sulfur corrosivity, and just thereafter, it was the first to propose on the market a solution: the Chedcos selective depolarisation, capable of stopping the corrosion phenomena in progress by eliminating the presence of the DBDS from the oil.
Under a normative point of view, we recall the updating of IEC 60296 ed. 4 standard of February 2012 and the publication, in the next few months, of edition 4 of IEC 60422 standard currently in the FDIS (FINAL DRAFT INTERNATIONAL STANDARD) phase.
