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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...HCFC-123 accelerated corrosionHCFC-123 accelerated corrosion
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4/30/2010 9:00 AM
 
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Carbon steel shell filled with liquid refrigerant HCFC-123 at 150 psig at minus 4 F shows massive corrosion after a few days in service. Culprit assumed to be moisture or water. What acids are formed when this refrigerant is exposed to moisture? Is it possible to quantify the corrosion rate of such a reaction(s)?
 
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4/30/2010 9:00 AM
 
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Hi there, HCFC-123 refrigerant has probability to decompose to HCl and HF if exposed to high temperature than recommended or subjected to static electric discharge etc. If you have moisture in the CS shell this will definitely cause v.strong acidic solution and if get diluted due to presence of excessive moisture or water it will lead to significant corrosion and shell failure even within days. I request to take detail background and perform a failure investigation/ postmortem study and let us all know. regards >Carbon steel shell filled with liquid refrigerant HCFC-123 >at 150 psig at minus 4 F shows massive corrosion after a few >days in service. Culprit assumed to be moisture or water. >What acids are formed when this refrigerant is exposed to >moisture? > >Is it possible to quantify the corrosion rate of such a >reaction(s)?
 
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5/1/2010 9:00 AM
 
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Investigation underway to determine root cause of failure. Selected various shell sections for micro-examination, along with various tube sections. Results to follow. Collected oxide deposits and await results of analysis. In theory, HCFC-123 is neutral and should not react at the operational temperature and pressure, 150 psig and minus 4 F. Operational history shows that the unit was previously "bench tested" with glycol on the shell side prior to being installed and commissioned on site. Glycol presumed to be 1/3 to 2/3 water mixture but source of water unknown. Original manufacture of the evaporator tests all units pneumatically in a specially constructed test bunker (4ft reinforced concrete walls) under video surveillance with nitrogen as the test medium. Is there any way to post photographs in this forum?
 
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