Reduction in downtime from 7-10 days to 24 hours
No personnel exposure to hazardous materials
Extremely clean equipment
The client would typically steam the columns for 7-10 days to purge the equipment of the hazardous materials prior to vessel maintenance. Previous attempts to chemically clean the towers had been unsuccessful.
FQE Chemicals designed a cleaning process to partially fill and circulate low concentrations of FQE LEL-V at temperatures of 82oC (180oF) for short periods of time (1-4 hours). The circulation process was performed three times. After each circulation the cleaning solution temperature was raised to boiling to flush over liquids to the accumulator. Each circulation liquid was drained to a frac tank with the towers refilled to 60% of capacity. After the final wash, the columns were flushed with fire water over the top tray to remove any loose materials (coke, scale etc).
Each column was sampled for EDC contaminant and was found to be clear. Upon opening the columns, each was clean from top to bottom. The plant staff was extremely please with the results of the cleaning process.