If you need turbine troubleshooting then contacting AJSS is the best decision you will make, as our expert team of industry experts can help you. Our superior turbine maintenance courses will give you or your team the knowledge and skills to maintain gas turbine engines in a number of industries around the globe. Getting into this growing and lucrative industry requires the right hands on experience, as well as technical training, which is where we excel.
Even though a turbine expander is of a hermetically sealed nature, a specific seal gas system is regularly used as well.
How Does a Turbine Expander Work
When in the expander the gas is at very low temperatures and unfiltered in smaller pieces. If gas was to be transmitted to the bearing housing the quality of the oil would decay really quickly and would be moved at such low temperatures that it faces a high chance of solidifying, also if oil passes from the bearing house to the expander it can complicate things really fast as it can get in the heat exchangers, freezing. If a heat exchanger gets any oil in it, getting it out can be a task that is nearly impossible to accomplish as it freezes therefore gets stuck completely and attempting a thorough removal can mean ruining the components completely.
Maintaining Gas & Fluids
Gas must be maintained away from magnetic bearings as cold gas can cause decay on many parts in them therefore the need of utilising seals to maintain the integrity of it as a whole and in order to maintain the process don’t by the oil and magnetic bearing systems separated within the bearing house the only way to achieve this is by using a buffered labyrinth seal as it forces the flow towards the bearing and expander housing which prevents fluids from getting into the other.
A stepped tapered labyrinth improves the ability of the seal to keep oil from the bearing housing and it lowers the flow from the buffer gas required by the seal. The usage of tapered labyrinth helps with access to the seal for its maintenance regardless of the seal`s axial location. To maintain a good barrier even if the seal wears out, the buffer gas has to be controlled with differential pressure not flow controlled. If the gas buffer is controlled by flow and the seal wears out the its ability to be useful as a barrier is jeopardised completely, if a differential pressure controller is used a seal that is damage can still function as a solid barrier since the additional flow will be managed with a differential pressure controller.
The lube oil system is hermetic, as it is in a home refrigerator which affects the viscosity of it due to the gas that flows in it, this means that the viscosity in the system will show a lower viscosity equal to the natural viscosity of it when it is not under these specific circumstances due to the phenomenon called dilution which is caused due the gas getting mixed with the lube oil in order for this to be dealt with the viscosity of the oil that is been used has to be increased.
Troubleshooting Turbines and Beyond
With the utilisation of magnetic bearings the oil dilution is inexistent therefore you will not have to be concerned to address this, to get more information on this matter or for further help contact us at https://ajss.com.au/training/.
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