May 2003

Valves/Piping

Generalized gravity flow line calculations

These equations handle fittings, instruments, block valves and different pipe sizes

Yu, F., Jacobs Engineering

An attempt to use my previously published article1 to calculate gravity flowrate of an existing piping system led me to realize that the work needs to be broadened and generalized. Two situations were not covered in the previous article: a gravity piping system may contain various fittings (elbows, reducers, etc.), instruments (such as orifice plates) and block valves, and an existing gravity piping system may consist of two or more different line sizes. These two aspects of gravity flow calculation will be covered in a more generalized approach. A generalized gravity flow system. The system is shown in Fig. 1. Li

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