Upprepade fel i Moog servostyrventiler orsakade dålig driftsäkerhet och tillgänglighet i en GE Frame 6FA gasturbin.
Servo-valve failure was common occurrence from early on in the life of the plant which was running on the initial fill of lubricant. This caused an unacceptable level of unplanned outages. Less than three years after commissioning, the situation was unmanageable. The high incidence of servo-valve malfunction had a negative impact on reliability and availability of the plant. Oil analysis confirmed evidence of increasing degradation of the lubricant.
Sedan Castrol Perfecto XPG installerades har inga registrerade avbrott för servoventilfunktionsfel förekommit under sju års drift.
Immediately on changing to Castrol Perfecto XPG servo-valve malfunction and failures due to deposits and varnish from lubricating oil were eliminated. At the same time, a dramatic reduction in the levels of total insolubles was observed in the oil as a result of the product’s extremely low sludge-forming and varnishing propensity.
Since filling with Castrol Perfecto XPG no supplementary cleaning systems have been used, and planned replacement of servo valves is limited to a three year interval at major outages. There has been no partial oil change, additive treatment or any other action.
Över sju år av tillförlitlig drift har registrerats med en enda fyllning av Castrol Perfecto XPG utan ett enda servoventilsproblem, som kan hänföras till lackbildning från smörjoljan.