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Underdeposit Corr. of Fractionator OVHD Exchangers in Crude Distillation Unit and Remedial Measures

Product Number: 51313-02225-SG
ISBN: 02225 2013 CP
Author: Faisal Al-Refai
Publication Date: 2013
$0.00
$20.00
$20.00

Under Deposit Corrosion of Fractionator OVHD Exchangers in Crude Distillation Unit and its Remedial Measures

Musaed M . AL-Arada Bader Al-Otaibi Faisal H. Al-Refai Anil Kumar Ray Ali R. AL-Azemi
Kuwait National Petroleum Company
Mina Abdulla Refinery
P.O. Box-69 Safat Kuwait 13001
Fax: +965-23280402
E-mail: fhr012@knpc.com


ABSTRACT

Fractionator OVHD System of Crude Distillation Unit consists of shell and tube type Exchangers. Carbon Steel metallurgy is used in both shell and tube with Fractionator Tower OVHD vapor on shell side and crude feed on the tube side.  Since commissioning frequent failures of these Exchangers have been reported causing loss of production. Failures were in the form of erosion-corrosion pitting & general wall thickness loss on the tube O.D. surface. These failures were as a result of under deposit corrosion due to presence of moderate to heavy fouling and formation of Iron Sulfide scales. Initially there were three exchangers and one more was added afterwards to combat erosion-corrosion problem of tubes. Tubes with different higher metallurgy (5Cr-0.5Mo 9Cr-1Mo) were tried from time to time however no improvement was noticed in the frequency of failure of tubes. Poor supply of wash water to the fractionator OVHD system resulted in accumulation of fouling on the tube O.D. surfaces leading to under deposit corrosion.

Keywords: under deposit corrosion fouling tube O.D. carbon steel pitting general wall loss CDU
 

Under Deposit Corrosion of Fractionator OVHD Exchangers in Crude Distillation Unit and its Remedial Measures

Musaed M . AL-Arada Bader Al-Otaibi Faisal H. Al-Refai Anil Kumar Ray Ali R. AL-Azemi
Kuwait National Petroleum Company
Mina Abdulla Refinery
P.O. Box-69 Safat Kuwait 13001
Fax: +965-23280402
E-mail: fhr012@knpc.com


ABSTRACT

Fractionator OVHD System of Crude Distillation Unit consists of shell and tube type Exchangers. Carbon Steel metallurgy is used in both shell and tube with Fractionator Tower OVHD vapor on shell side and crude feed on the tube side.  Since commissioning frequent failures of these Exchangers have been reported causing loss of production. Failures were in the form of erosion-corrosion pitting & general wall thickness loss on the tube O.D. surface. These failures were as a result of under deposit corrosion due to presence of moderate to heavy fouling and formation of Iron Sulfide scales. Initially there were three exchangers and one more was added afterwards to combat erosion-corrosion problem of tubes. Tubes with different higher metallurgy (5Cr-0.5Mo 9Cr-1Mo) were tried from time to time however no improvement was noticed in the frequency of failure of tubes. Poor supply of wash water to the fractionator OVHD system resulted in accumulation of fouling on the tube O.D. surfaces leading to under deposit corrosion.

Keywords: under deposit corrosion fouling tube O.D. carbon steel pitting general wall loss CDU
 

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