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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Recycle gas cooler leakRecycle gas cooler leak
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4/16/2007 9:00 AM
 
We have recycle gas cooler whose tubes are of A249-Tp316L through which process gases flowes mostly of hot chlorine vapour arround 200 deg centi and shell side cooling water to cool the hot vapours of chlorine. The life period was usually about 3 years but this time it failed within 18 months. On inspection found water in green colour indicating presence of chlorine with ph of 1.5 and also found some flakes which were being done for xrd analysis. Please sugget is it chlorine attack on the tubes which caused the failure as liquid chlorine in lower concentration is more harmfull than hot vapour chlorine or concentrated chloine? the tube damage was found on inlet side (hot). Do I need to do any further analyis? Please suggest.
 
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4/18/2007 9:00 AM
 
Hagani 786 TP 316 L will have good resistance at 100% concentration of hot chlorine at your temperature of 200 deg cent. If temperature drops or concentration gets lower (due to process condition variable changes), TP 316 L will be affected by pitting and SCC also . The fact that you are getting chlorine pH @ 1.5 indicates that some possibility of entry of moisture and hot vapor cholorine getting diluted to HCL exists ( i.e, hot chlorine either gets condensed and becomes dil HCL or with lower concentration of hot cholorine RP 316 L starts pitting). TP 316 L will pit and fail if temp drops or concentration of hot chlorine gets lower below 80% at your operating temperature or even at a lower operating temperature of around 80-100 deg cent. You may try to analyze the flaks and greenish color deposita also. Please check if the tube supplied is only TP 316 L or with additions of Cu etc as special grade materials. Trust this helps you to investtigate further C.V.Srinivasan Nishi Engineers Pvt Ltd India April 19, 2007 E-mail: nishi@vsnl.com >We have recycle gas cooler whose tubes are of A249-Tp316L >through which process gases flowes mostly of hot chlorine >vapour arround 200 deg centi and shell side cooling water to >cool the hot vapours of chlorine. The life period was >usually about 3 years but this time it failed within 18 >months. On inspection found water in green colour indicating >presence of chlorine with ph of 1.5 and also found some >flakes which were being done for xrd analysis. Please sugget >is it chlorine attack on the tubes which caused the failure >as liquid chlorine in lower concentration is more harmfull >than hot vapour chlorine or concentrated chloine? the tube >damage was found on inlet side (hot). Do I need to do any >further analyis? Please suggest.
 
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