Dry Air Preservation

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benotype Commentator Join Date: Nov 2009 Posts: 89	Dry Air Preservation 08/14/2010 5:04 AM
	I am preserving a 25MVA transformer with dry air, i had cause to change the bottle when it was empty and put a new one, after some months i realized the new bottle was is almost finished but they are traces of brown coloring inside the rubber transparent tubes that carry gas to the low pressure guage before the gas is feed to the transformer tank.The intermediate and low pressure guages do not seem to be responding to pressure changes from the 1st pressure regulating valve and i am quite convinced it is because of the brown substance inside the tubing.My big question is what is the cause of the brown colored substance in the ruber tubing? Is it possible that water leaked in to the tube or the gas i used was not good enough? Note: It is 25MVA Hyundai Auxiliary Transformer (15kv/6.6kv)
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#1 Re: dry air preservation 08/14/2010 10:09 AM
	Yes, you might have a water leak or gas contamination. The only way you will be able to guarantee identifying the cause of your problem will be by getting a qualified individual to examine your installation. You've not given us anywhere near enough information to help us speculate as to what your possible problem might be. Let me ask you a few questions that may help us to identify the likely culprit. Is this brown substance a powder, paste, coating or discoloration of the tubing. Might this brown substance be a chemical breakdown of the tubing or bits and pieces of another gasket in the assembly. Is the tubing above or below the transformer so that transformer oil might be syphoned into the tubing by accident. Did you do a pressure retention test of the transformer to verify a tight seal of all gaskets. What was the maximum pressure rating for the transformer chassis, a few PSI or just a few inches of water. I know of many clear flexible tubings, but none of them are made of rubber. So you might have an unexpected chemical reaction happening between this tubing material and the oil vapors. Where is this transformer; in direct sunlight on a pole, part of a switchyard on the ground, inside a building. __________________ "Don't disturb my circles." translation of Archimedes last words
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Rorschach Guru Join Date: Jan 2008 Location: Spring, Texas Posts: 3403 Good Answers: 150	#2 Re: Dry Air Preservation 08/15/2010 12:54 PM
	This does not address your initial problem, but I would suggest in the future, Nitrogen should be used instead of air. __________________ Who is John Galt?
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