Horizontal Vapor-Liquid Separator Nomograph

A horizontal drum is the choice when large liquid loads are involved. Consequently, holding time will probably set the size. 

Enter the nomograph on the scale at left with the holding time. 

Connect the time with the liquid space. Base your first trial on an 86% full drum (less if the minimum liquid level is other than the bottom of the drum). Mark the intersection with Index Line A. 

Reenter the nomograph at the right with the flow rate. No need to convert units — just use the scale having your units. 

Move horizontally to the flow index line. (If your units are hot gph, omit this step. You are starting at the flow index line.) 

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Scheiman, A.D. Use Nomographs to Size Horizontal Vapor-Liquid Separators. Hydrocarbon Processing Petroleum Refiner, 1964, p. 155. 

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