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Sampling System Design: Managing System Variables

By Randy Rieken |

Understanding the effect of flowrate, velocity, density, viscosity, pressure drop, friction, components and sample line sizes will help you design a sampling system The primary goal when designing an analytical sampling system is to ensure timely, accurate measurements. The sooner you can discover anomalies in a process stream, the sooner you can react to correct them. To meet this goal, your sampling system should minimize time delay, or the total time elapsed from tapping the process stream to completing sample analysis. It should also ensure that the sample is not contaminated and accurately represents true process-stream conditions. This may require some form of conditioning, such as maintaining sample temperature, as the sample moves from the process tap to the analyzer. Figure 1. Minimizing the amount of material sampled reduces waste and limits disruptions to the process stream. Reducing the flowrate through a single-line sampling system (1a and 1b), which disposes of samples via a vent, flare, or drain, will reduce process fluid waste. Reducing the flowrate through a fast-loop system (1c and 1d) that returns the sample to process will reduce the potential for interference with the process stream (Source: 1a and 1c from Ref.…
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