Optimum liquid line size

For liquid line, required hors wer for line pressure drop is calculated by following equation  

Pressure drop other than ftiction, dpx, for a line with fixed flow is constant. Substitute Eq. (37) into Eq. (36b), and Eq. (36b) into Eq, (34). CO is a fimction of line inside diameter, d, assuming fnction factor, f, is constant. 

For carbon steel or stainless steel piping, pm=488.357 Ib/ft3, sp. gr. 7-83, Eq. (38a) is reduced to following equation. 

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Optimum single phase (liquid or vapor) line size is discussed in this section. It only applies to cases where Ime pressure drop has a cost to plant. For example, pump or compressor is used to overcome the line pressure drop. It is not applicable to eases where line pressure drop Is free, such as a pressure let down line. 

Optimum liquid and vapor line size equations are presented in following sections. Nomenclatures, assumptions, and equations of the symbols used in this section are explained as follows ... 

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