V 3f

where f = cycles per second (cps)

As an example, consider a tower 17 feet in diameter with an average liquid depth of 5 feet. Then:

Noise amplitude is usually greater at low frequencies. Therefore, in this case, any filtering or damping that we design should provide significant attenuation for frequencies as low as 0.75 cps.

Column-Base-Reboiler "Manometer"

Another source of noise is sometimes encountered in columns with ther-mosyphon reboilers. It has the natural frequency of the "manometer" between the column base and the reboiler (Figure 11.6). Roughly this is:


L = length of piping from base to reboiler, feet

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