Steam Turbine Lubrication Oil regeneration with low RPVOT

Our RPVOT has reduced to @ 40% of new oil (current oil is @ 6 years old)tan and viscosity are also trending well. I'd like to know is there some kind of formula or rule of thumb that will indicate what improvement would be made if the oil had a partial replacement. Ie, remove say 30% or 50% and replenish with new oil? I assume it would not be proportional?

Regards B
Original Post

Hi Bigal,

RPVOT 40% is a warning for you that the service life of the lubricating oil was consumed and you need to do something if you want the existing oil to still servicing more further. Otherwise soon you have to schedule it for Oil Replacement.

Before Top-Up action of 30 - 50%v, Since it is 6 years servicing already, then I recommend you to check The Varnish Potential Rating Test by MPC (ASTM D7843), and RULER Test as well (ASTM D6971).

Once OK, go ahead for Top-Up. IF NOT, (1) it is recommended for you to reduce the varnish rating using varnish removal devices. (2) Oil replacement.

Good luck Bai.

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