Our Desalter transformer has got three transformers supplying to individual grids. This step up transformers are facilitated with three outlet tappings with higher ratings. We always run the desalters with same outlet tappings for all three transformers. Is it advisable to run it with different outlet tappings in all three transformers in a desalter?
I would like to know electrical feasibility as well as process advantages?
Answers
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05/12/2013
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A:
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Prabu Natarajan, Natco Uk Ltd, prabunatarajanuk@yahoo.com
We can play with tap changers whilst doing the commissioning to get the optimized volatge for the particular crude. It is feasible but for a commissioning engineer it is easy to maintain same outlet on all the 3 tap changers rather playing with it. It will give him more detailed idea of what is actaully causing the problem i.e wash water, voltage, salt etc etc. The power unit connected to the top may require higher output to bring the water droplet together as crude at that point will have less water content and thus be less conductive. It also depend on what kind of 3 grid arrangement you have.
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08/08/2012
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A:
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Sudhakara Babu Marpudi, Dangote Oil Refinery Company, m_sudhakarababu@yahoo.com
There should not be any problem in operating the desalters with different tapping levels. Consider the situation of one transformer under maintenance (as running with Zero voltage). However running the desalters with different power consumption levels may alter the overall desalting and dehydration efficiencies.
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