Margin area, separators

Figure 14. Polyethylene separator cross-ribs in the margin area...

Although more than 95% of earthquakes occur in plate margins (meaning areas in which plates separate, grind past each other, or collide). New York State has experienced over 400 earthquakes in the past two centuries and it is not near any plate margins. 

The next step is to obtain equations for the solution of the shadow and marginal prices. This requires the evaluation of various derivatives of the constraint equation matrix. However, because not all the constraints are in algebraic form (those constraints that are functions of steam table properties) numerical derivatives must be evaluated. One other note, there are two condenser costing equations. This means that two separate derivatives must be taken and the derivative corresponding to whichever costing equation is valid for that value of condenser area, is the one that should be used. 

Since the separator achieves its maximum efficiency when the velocity is in the range of 20% to 100% of 20% more area should be allowed as a safeiv margin, to take into account liquid loading and surges. 

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