NOTICE

When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as "anonymous". All NEW posts will show up credited to their authors. So please participate and share knowledge just as you have in the past.

You must log in if you are an existing user or register if you are a new user in order to contribute to the discussions.

Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...HCFC-123 accelerated corrosionHCFC-123 accelerated corrosion
Previous
 
Next
New Post
4/30/2010 10:00 AM
 
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)?
 
New Post
4/30/2010 10:00 AM
 
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)?
 
New Post
5/1/2010 10:00 AM
 
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?
 
Previous
 
Next
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...HCFC-123 accelerated corrosionHCFC-123 accelerated corrosion


  

News

The safe operation of oil refineries in the United States is under constant r...read more
When: January 30, 2017 - February 2, 2017 Where: Galveston Island Conventi...read more

View all articles

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion