Rising Cl level on Azimuth Thruster Gear oil.

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Im seeing an increase on my Fe(81ppm) and Cl(50ppm) levels in our Azimuth Thruster gear oil. I would expect it to be because of salt water ingress though the shaft seal, but the spectral analysis does not show rise of Sodium(6-12ppm). Shaft seal gravity tank does not show any proofs of leaks. Why am i seeing this increase in Cl?

12/10/163:03 AM

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