Why does Koch-Glitsch recommend a maximum percent of flood of 80%?
This value gives a conservative 25% safety factor to allow for any inaccuracies a customer might make in calculating loadings and for those in the design equations. The industry generally employs 80% flood as a standard for the maximum operating range for normal design. Most systems show a decline in tray efficiency at rates exceeding 80% flood. This results In extra energy use or a product of lower quality.