What are the negative impacts of varnish (sludge)?
Varnish build-up has long been a problem, particularly in turbine and hydraulic. System failures due to varnish problem can be:
(1) Sticking or seized occurs in moving mechanical parts such as servo control valve.
(2) Plugged or restricted small oil flow orifices.
(3) Loss of heat occurs in heat exchangers due to varnish's insulation effect, cause to increase oil temperature.
(4) Attract dirt and larger contaminants, increasing wears and component failure.
(5) Encourage premature bearing failure.
(6) Catalytic deterioration of turbine oils and hydraulic oils.
