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97266 MEASUREMENT OF CORROSION UNDER INSULATION AND EFFECTIVENESS OF PROTECTIVE COATINGS

Picture for 97266 MEASUREMENT OF CORROSION UNDER
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Product Number: 51300-97266-SG
ISBN: 97266 1997 CP
Author: Dharma Abayarathna, William G. Ashbaugh, Russell D. Kane, Nancy McGowrm, Bob Heimann
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A laboratory cell set-up was designed and constructed for the simulation of corrosion under insulation (CUI) on a pipe section at elevated temperature. The CUI cell consisted of six carbon steel ring specimens separated by insulation spacers and held together by blind flanged pipe sections on both ends. Thermal insulation which was placed around the testing section provided the annular space to retain the test environment. The ring specimens were used as test electrodes in two separate electrochemical cells. One cell was used as the control while the other was used to test applied protective coatings. Corrosion measurements were made using both electrochemical polarization resistance and mass loss data under isothermal and cyclic wet/dry test conditions. The test cell was used to (1) successfully simulate CUI in the laboratory, (2) evaluate the corrosivity and different modes of corrosion observed with CUI and (3) evaluate proprietary coatings for minimizing CUI under simulated CUI condhions. Keywords: corrosion, stress corrosion cracking, insulation, CUI, isothermal, polarization resistance, mass loss, coatings
A laboratory cell set-up was designed and constructed for the simulation of corrosion under insulation (CUI) on a pipe section at elevated temperature. The CUI cell consisted of six carbon steel ring specimens separated by insulation spacers and held together by blind flanged pipe sections on both ends. Thermal insulation which was placed around the testing section provided the annular space to retain the test environment. The ring specimens were used as test electrodes in two separate electrochemical cells. One cell was used as the control while the other was used to test applied protective coatings. Corrosion measurements were made using both electrochemical polarization resistance and mass loss data under isothermal and cyclic wet/dry test conditions. The test cell was used to (1) successfully simulate CUI in the laboratory, (2) evaluate the corrosivity and different modes of corrosion observed with CUI and (3) evaluate proprietary coatings for minimizing CUI under simulated CUI condhions. Keywords: corrosion, stress corrosion cracking, insulation, CUI, isothermal, polarization resistance, mass loss, coatings
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03029 STRATEGIES TO PREVENT CORROSION UNDER INSULATION IN PETROCHEMICAL INDUSTRY PIPING

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ISBN: 03029 2003 CP
Author: Brian J. Fitzgerald, Peter Lazar III, Robert M Kay, Stefan Winnik
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Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
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