August 2005

Special Report: Fluid Flow and Rotating Equipment

A simple way to estimate equipment pressure drops

The equivalent line length method can be used to estimate equipment pressure drop at different operating conditions

Yu, F., Jacobs Engineering

Sometimes we need to estimate the pressure drop of equipment at different operating conditions. This can happen in feasibility, revamp and hazardous studies or a relief contingency analysis. An accurate pressure drop is not required for these situations. The equivalent line length method is simple and quick for these purposes. The basic idea of the equivalent line length method is to use an equivalent line length of selected line size to represent the equipment's pressure drop under a set of operating conditions. Then, use this equivalent line length to estimate the equipment pressure drop at other operating conditions. This article describes how to use the equivalent line length method

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