Estimating Submergence Required to Prevent Gas Blow Out

In this section we shall present a simple method for estimating the submergence required to prevent incoming vapor from escaping out the bottom opening of a defoaming cyclone. From fluid statics, we know that the hydrostatic pressure at the bottom opening of the cyclone, at elevation z = 0 (see Fig. 14.4.1), must equal the hydrostatic pressure at this same elevation outside the cyclone. This leads directly to the relationship  

Vane sections remove small droplets from the gas stream 

Revolution tubes speed up gas/tlquld separation process 

Gas outlet vortex breaker prevents re-entrainment of liquid phase 

This equation relates the elevation of the liquid level in the cyclone, h, to the submergence, H, and the inlet-to-overflow and inlet-to-underflow pressure 

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