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OILS & LUBRICATION


FEATURE SPONSOR


COLD COMPLICATIONS


The task of lubricating the turbine is particularly challenging in extremely low temperatures. -50o


As temperature decreases, the grease’s resistance to flow increases, affecting central grease systems in two ways…


1. Reduced ‘pumpability’ – more pressure is required to deliver the grease to the lubrication points, which means that system capabilities can be exceeded


2. Reduced ‘slumpability’ – less grease flows into the suction side of the pump, so that the grease flow in the system can be disrupted


Take the pitch bearing for example. Located in the nose at the front of the turbine, the pitch is fully exposed to the elements all year round. In extremely cold conditions, NLGI 1.5, 460 viscosity greases have been found to thicken while travelling to the pitch bearing, resulting in excessive power being required to help the grease reach the bearing. It is therefore essential that the selected lubricant has flow characteristics that guarantee an adequate grease supply to all lubrication points. Qualifying a grease at


C requires the pressure not to exceed 1600mbar in a defined test rig. Any higher and the pressure can mean the grease is not delivered at the defined temperature. Further complications can be experienced in the grease reservoir. Here, the grease travels into the central lube system via a pump. The pump is below the reservoir, allowing gravity to help push the grease into the pump. However, an NLGI 1.5, 460 viscosity grease may stick to the sides and be too thick to reach the pump in extreme cold environments. As a result, the pump will fail to deliver grease, leaving parts of the bearing unprotected.


NEW GENERATION WIND TURBINE GREASE


ExxonMobil’s Mobil SHCTM Grease


102 WT is an example of a lubricant scientifically engineered to operate effectively in extreme cold temperatures. The unique features of its synthetic base fluids are combined with a high quality lithium complex thickener to ensure it provides excellent bearing protection and


structural stability from -50˚C to 120o C.


In fact, even at -50˚C, Mobil SHC Grease 102 WT offers excellent mobility and pumpability at 600mbar, helping ensure optimum lubrication while also protecting against pressure-related issues.


PROTECTION FROM WITHIN


As wind turbines are installed in ever- more challenging environments, windfarm operators must optimise every element of their operation to help protect their machinery. The right lubricant, such as Mobil SHC Grease 102 WT, can help extend equipment life, reduce maintenance costs and increase uptime – protecting their business from within.


Mobil Lubricants SCAN/CLICK


MORE INFO


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www.windenergynetwork.co.uk


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