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08173 Cavitation and Erosion Damage of Reboiler Stripper Tubes in Gas Manufacturing Industry

Picture for 08173 Cavitation and Erosion Damage of Reboiler Stripper Tubes in Gas Manufacturing Industry
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Two successive leakages were reported in the heat exchanger composed of 8 rows of finned tubes of the convection section of the condensate stripper re-boiler.  A comprehensive study (Failure Analysis) has been conducted to reveal the form of failure. The failure was recognized as erosion and cavitation damage.

Product Number: 51300-08173-SG
ISBN: 08173 2008 CP
Author: Hussein Rahmatalla, Mohammed Maqbool Ahmed, and Abdulla Radi Al-Hajri
Publication Date: 2008
Industry: Corrosion Monitoring and Control
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Two successive leakages were reported in the heat exchanger composed of 8 rows of finned tubes of the convection section of the condensate stripper re-boiler (U-H8300), the 3rd and the 4th rows used in Qatar. A comprehensive study (Failure Analysis) has been conducted to reveal the form of failure, by finding out the root cause of that failure, then suggest and implement the suggested practical solution. The failure was recognized as erosion and cavitation damage. All 8 rows of the re-boiler tubes, except the 1st and the 2nd rows, were made carbon steel as per ASTM 106 Grade B. The most severe working conditions were encountered in the early stages of the stripping process, i.e., in the 1st and 2nd rows, where the amount of the gas carried, temperature and pressure were higher. However no failure occurred in the tubes of the 1st and 2nd rows, simply because they are made from higher corrosion resistance alloys, AISI 316 stainless steel. Moreover, no failure has been yet reported in the 5th-8th row tubes. This was due to the working conditions were less severe in the 5th-8th row tubes, although they were made from same carbon steel (ASTM 106 Grade B).

Key Words: Cavitation corrosion, Erosion-corrosion, Re-boiler tube, Cavitation–erosion, ASTM steels, Failure analysis, Leakage, Heat exchanger

 

Two successive leakages were reported in the heat exchanger composed of 8 rows of finned tubes of the convection section of the condensate stripper re-boiler (U-H8300), the 3rd and the 4th rows used in Qatar. A comprehensive study (Failure Analysis) has been conducted to reveal the form of failure, by finding out the root cause of that failure, then suggest and implement the suggested practical solution. The failure was recognized as erosion and cavitation damage. All 8 rows of the re-boiler tubes, except the 1st and the 2nd rows, were made carbon steel as per ASTM 106 Grade B. The most severe working conditions were encountered in the early stages of the stripping process, i.e., in the 1st and 2nd rows, where the amount of the gas carried, temperature and pressure were higher. However no failure occurred in the tubes of the 1st and 2nd rows, simply because they are made from higher corrosion resistance alloys, AISI 316 stainless steel. Moreover, no failure has been yet reported in the 5th-8th row tubes. This was due to the working conditions were less severe in the 5th-8th row tubes, although they were made from same carbon steel (ASTM 106 Grade B).

Key Words: Cavitation corrosion, Erosion-corrosion, Re-boiler tube, Cavitation–erosion, ASTM steels, Failure analysis, Leakage, Heat exchanger

 

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