The hydraulic control/governor systems of the turbine are used for controlling different valves e.g. throttling valves. It is essential for the efficient production of energy that these valves function properly.
Whether it is valves for fuel or steam supply, you will find very fine tolerances in the servo valves (e.g. MOOG). Oil Degradation will lead to a layer of varnish on the internal surfaces and this can make plungers stick, which leads to tripping of the turbine.
The oil types in these systems can be mineral oils or phosphate esters, and the contamination of the hydraulic oil is related to particles, oil degradation products and water. Where phosphate esters are used, acids are also a major concern.
Particles and water will cause wear to the equipment and speed up the oil degradation process. Oil degradation products (resins) will clog in-line pressure filters and cause mal-function of valves. Water ingress is normally not a major problem in the hydraulic controls of steam turbines, but water can be present due to condensation.
A suitable CJC™ Oil Filtration System for maintaining clean oil would be CJC™ Fine Filters for mineral hydraulic oils and CJC™ HDU Ion Exchange Filter with the media for phosphate esters. In cases where water contamination is present, a CJC™ Filter Separator is recommended.
