System Design and Support

The objective of system design and support is to install an online analyzer that measures physical properties and chemical compositions in dynamic processes. This objective means selecting the right equipment, making sure it is

FIG. 3.12.5 A typical multiprocess GC interface to the DCS. In this configuration, only process GC data, validation, system alarms, and stream sequence control are available to the DCS operator. All control and data communication is available to the AMS operator. (Reprinted, with permission, from The Foxboro Co.)

FIG. 3.12.5 A typical multiprocess GC interface to the DCS. In this configuration, only process GC data, validation, system alarms, and stream sequence control are available to the DCS operator. All control and data communication is available to the AMS operator. (Reprinted, with permission, from The Foxboro Co.)

reliable, and making sure it provides the proper analytical data to the users.

The goals of a project are determined by the analytical requirements of the plant. These requirements include the chemical components or properties to be determined, as well as the ranges, precision, accuracies, and response times. The analyst must define the minimum analytical requirements, the optimum requirements, and the degree of flexibility between them.

Technologies compete. One method of analysis can overlap another in capability which means that more than one technology can give satisfactory results and the analyst must choose between technologies.

The analyst should test equipment before installation to verify its reliability and define the probable maintenance requirements. Regardless of how simple or complex the online systems is, every system requires constant validation and maintenance.

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