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Jacking oill pumps are fairly new in the power industry. They are necessary today because of the large turbines with multiple low pressure shells. The longer the rotor the more likely to do damage to it as it rolls off of turning gear. The turbines containing only two low pressure wheels can be started with an auxiliary oil pump that supplies higher pressure than turning gear pumps. Most large turbines have been retrofitted with lift pumps because they prevent damage to the rotor and journals.

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