Temperature and gamma scans identify problems in crude tower

Mayela Perez, Ricardo Duarte Pdvsa Manufacturing & Marketing SA Caracas, Venezuela Lowell Pless Tru-Tec Services Inc. La Porte, Tex. Using temperature profiles and gamma scans with traditional data-collection methods (that is, operating data and physical inspections) helps to reliably detect and identify the cause of maldistribution in fractionation towers. In 1994, the use of temperature profiles and gamma scans shortened the downtime for the vacuum-distillation tower of Pdvsa's El Palito, Venezuela, refinery by more than 50%. In 1991, similar damage took 12 days to repair while the unit was offline; however, in 1994, the damage took only 5 days to remedy...

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