By American Institute of Chemical Engineers (AIChE)
This re-creation of a depended on consultant combines and updates the easiest to be had box wisdom on either trayed and packed distillation columns. in a single entire, easy quantity, it provides a compilation of options instead of a unmarried set of obligatory steps, permitting readers to pick the technique that most closely fits their wishes. With its engineer-tested systems and targeted causes, the 3rd variation offers chemical engineers, plant managers, and different pros with firstclass recommendation on assessing and measuring functionality for a number of distillation column forms in a number of functions.
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Extra resources for AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation
26 Trayed and Packed Columns Where practical, the differential pressure sensing device should be installed high enough so that gasor vapor-filled lines leading from the column to the sensing device drain freely back into the column. It is also very important to employ lines of the proper size to avoid vapor condensations and capillary liquid hold-ups. One-half to one-inch (13 to 25 mm) diameter lines are usually recommended. Low spots in these lines that can collect condensate should be avoided.
Technically, it is an electromagnetic flow meter and works by applying a magnetic field to the metering tube/pipe, which results in a potential difference proportional to the flow velocity perpendicular to the magnetic flux lines. The magnetic flow meter requires a conducting fluid, such as water, that contains ions, and an electrical insulating pipe surface, like a rubber-lined steel tube. Though they will generally not work with hydrocarbons, distilled water and many non-aqueous solutions, they work well where low pressure drop and low maintenance are required.
Obtaining a representative sample of the vapor from a large column is unlikely. Relying on liquid samples is strongly recommended and one should obtain the average vapor composition leaving a stage by calculation. Samples taken above and below the feed point may be desirable for simplifying interpretation of test results. 3 1 2 . 1 Internal Samples for Efficiency Checks Where practical, internal samples (preferably liquid) should be withdrawn from several points in the column sufficient to establish a complete concentration gradient along the section in question.