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Continuous digester rapid thinning, TAPPI Journal June 2024
ABSTRACT: Carbon steel continuous digesters built after the early 1980s are fully stress relieved, so stress corrosion cracking has been less of a concern. However, these newer digesters were designed to run modified cooking processes that have turned out to be much more corrosive than those running with conventional cooking. This corrosion is mainly associated with softwood digesters and appears to be flow related. Average corrosion rates of 40 mil/year are possible on the exposed shell between the wash and extraction screens. The corrosion patterns are visually distinct from surfaces in the upper digester and below the wash screens. This paper goes into practical detail on where it occurs, the causes, visual identification, inspection planning and results evaluation, and finally, how to mitigate this damage, which consists of applying a corrosion resistant barrier. Some discussion on dealing with general corrosion throughout the digester is included.
Journal articles
Enhancing kraft pulping through unconventional, higher sulfide-containing pretreatment liquorsâ??A review, TAPPI JOURNAL, Online Exclusive, March 2003, Vol. 2(3) (347KB)
Enhancing kraft pulping through unconventional, higher sulfide-containing pretreatment liquors–A review, TAPPI JOURNAL, Online Exclusive, March 2003, Vol. 2(3) (347KB)
Journal articles
Selective removal of chloride and potassium in kraft pulp mills, TAPPI JOURNAL, April 2003, Vol. 2(4) (141KB)
Selective removal of chloride and potassium in kraft pulp mills, Solutions! & TAPPI JOURNAL, April 2003, Vol. 2(4) (141KB)
Journal articles
Minimizing baso4 scale formation In ecf bleach plants, TAPPI JOURNAL, March 2003, Vol. 2(3) (119KB)
Minimizing baso4 scale formation In ecf bleach plants, Solutions! & TAPPI JOURNAL, March 2003, Vol. 2(3) (119KB)
Journal articles
Effect of clay-stickie interaction on centrifugal cleaner efficiency, TAPPI JOURNAL, April 2003, Vol. 2(4) (180KB)
Effect of clay-stickie interaction on centrifugal cleaner efficiency, TAPPI JOURNAL, April 2003, Vol. 2(4) (180KB)
Journal articles
The role of evaporative dewatering in impulse pressing, TAPPI JOURNAL, March 2003, Vol. 2(3) (185KB)
The role of evaporative dewatering in impulse pressing, TAPPI JOURNAL, March 2003, Vol. 2(3) (185KB)
Journal articles
A sensor for microstickies, TAPPI JOURNAL, Online Exclusives, April 2003, Vol. 2(4) (174KB)
A sensor for microstickies, TAPPI JOURNAL, Online Exclusives, April 2003, Vol. 2(4) (174KB)
Journal articles
Hexenuronic acid contents of eucalyptus globulus kraft pulps: variation with pulping conditions and effect on ecf bleachability, Solutions! & TAPPI JOURNAL, May 2003, Vol. 2(5) (188KB)
Hexenuronic acid contents of eucalyptus globulus kraft pulps: variation with pulping conditions and effect on ecf bleachability, Solutions! & TAPPI JOURNAL, May 2003, Vol. 2(5) (188KB)
Journal articles
Deinking of recycled mixed office paper using two endo-glucanases, celb and cele, from the anaerobic fungus orpinomyces pc-2, TAPPI JOURNAL, July 2003, Vol. 2(7) (108KB)
Deinking of recycled mixed office paper using two endo-glucanases, celb and cele, from the anaerobic fungus orpinomyces pc-2, Solutions! & TAPPI JOURNAL, July 2003, Vol. 2(7) (108KB)
Journal articles
Factors affecting fatty acid oxidation and the formation of odorous aldehydes during tmp production, TAPPI JOURNAL, July 2003, Vol. 2(7) (99KB)
Factors affecting fatty acid oxidation and the formation of odorous aldehydes during tmp production, Solutions & TAPPI JOURNAL, July 2003, Vol. 2(7) (99KB)