xxonMobil Lubricants & Specialties has launched Mobil DTE 932 GT, a scien- tifically engineered gas tur- bine oil which it says can help oil and gas operators to increase productivity by re- ducing unscheduled down- time and supporting their safety and environmental care objectives. Engineered to enhance the performance of frame size combustion gas turbines with a common hydraulic and bearing oil reservoir, Mobil DTE 932 GT can help provide trouble-free service in gas tur- bines, which is crucial given the oil and gas industry’s re- liance on turbine reliability. Gas turbines play a fun- damental role in liquefied


Oiling the turbines E


Statoil’s


Hammerfest LNG plant


catchall term for deposits found in gas turbine opera- tions. “Varnish can have a sig- nificant detrimental impact on gas turbine operation, but Mobil DTE 932 GT offers the potential for greatly reduced varnish formation,” said Yan Côté, global business devel- opment advisor, ExxonMobil Lubricants & Specialties.


natural gas (LNG) produc- tion, with many LNG plants using gas turbines to drive compressors that cool and liq- uefy gas for transportation. Keeping gas turbines running effectively is key to maximis-


Reducing the pressure I


ndustrial manufacturer Eaton has introduced a pres-


sure reducing valve specifically designed for wind energy ap- plications.


The additional function of the 1 PDC5 pressure reducing valve is its ability to keep the pressure of an accumulator stored for a long period of time without any significant leak- age.


Its performance character-


istics help improve the energy efficiency of the wind turbine’s hydraulic system. By reducing the number of times that the power pack has


ciency product offer for the oil and gas industry, with the ad- dition of the new Caterpillar Motoren (CM) offshore engine series, having been appointed as the authorised distributor for the new range in the UK and Ireland. The CM range of engines, already well proven in marine


C


aterpillar dealer, Finning, has extended its high-effi-


to start in order to maintain the pressure in the accumula- tor, the 1 PDC5 valve helps keep the power consumption of the hydraulic system of the wind turbine to a minimum by reducing the number of times the power pack has to start in order to maintain the pressure in the accumulator. 1 PDC5 features an intelli- gent design using a direct act- ing poppet with only two working ports. At low pres- sure, the pilot piston keeps the ball away from the valve seat. As pressure increases, the pilot piston is forced back against


applications throughout the world, offers economical, clean and reliable medium-speed service for use in drilling, main power generation, production pumping and floating produc- tion storage and offloading. Models are available to suit


a wide variety of fuel types, in- cluding heavy fuel oils, crude oil, diesel, natural gas as well as dual-fuel options.


Offshore Technology November/December 2012


The Eaton 1 PDC5 pressure reducing valve


the spring until the ball sits on the seat.


The inlet pressure can then rise up to the maximum system pressure. If the inlet pressure is


Offshore engine


The Caterpillar Motoren offshore engine


35


removed, the ball will remain on the seat, maintaining the pressure in the accumulator for a long period of time without any significant leakage.


ing plant productivity and re- ducing unscheduled down- time.


One challenge to main- taining effective gas turbine performance is controlling the formation of varnish, a


CORRECTION: In the Sep- tember edition of OT, we in- correctly stated that “At -400C Mobil SHC 500 Series is four times thinner than similar vis- cosity index conventional mineral hydraulic oils…” This should have read “At -40 de- grees C…” We apologise for the error.


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