Download PDF by American Institute of Chemical Engineers (AIChE): AIChE Equipment Testing Procedure - Trayed and Packed

By American Institute of Chemical Engineers (AIChE)

ISBN-10: 1118627717

ISBN-13: 9781118627716

This re-creation of a relied on consultant combines and updates the easiest to be had box wisdom on either trayed and packed distillation columns. in a single whole, straightforward quantity, it provides a compilation of strategies instead of a unmarried set of obligatory steps, permitting readers to choose the approach that most nearly fits their wishes. With its engineer-tested approaches and unique motives, the 3rd variation offers chemical engineers, plant managers, and different execs with first class recommendation on assessing and measuring functionality for a number of distillation column varieties 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

Example text

The column pressure is generally measured at the top of the column. The existence of static vapor head in the column and pressure drops will make the pressure at the bottom of the column higher, especially for highpressure trayed columns. To calculate the column local pressure, the pressure drop and the static vapor head need to be added to the pressure measured at the top. 6 Vapor Static Head and Column Pressure: The differential pressure between two locations in a distillation column has two components—static head due to the weight of the vapor between them, and dynamic pressure drop due to the resistance of column internals to the flow.

8 5. Cautiously open 5 Θ. Close 9. 10 7. Cautiously open 6 To get * 0 " Reading at Tower after Steps 1 - 7 8. Close 1 . 2 9. Open 13 and 14 completely and cautiously. Figure 7. Measuring Pressure Drop with Purge Gas Seal 29 AlChE Equipment Testing Procedure SEAL POT *-XJ- —^4™ ♦-X- /■^ r\ i DRIP LEGS NEEDLE VALVES FLOW INDICATORS PURGE LIQUID (HEAVIER THAN TOWER LIQUID) MANOMETER (OR DIFFERENTIAL PRESSURE INSTRUMENT) Figure 8. Measuring Pressure Drop with Purge Liquid Seal 30 Trayed and Packed Columns SEAL POT —ex- 3/r PRESSURE TAP UNE —CX- i X FILL LINE — X MANIFOLD VALVE XH-tX- LJ MANOMETER VALVE MANOMETER (OR DIFFERENTIAL PRESSURE INSTRUMENT) Figure 9.

35 (29) Table 1. 3 Seal Pots Seal pots are recommended in all connections from column to pressure-tap lines. A suggested size is an 8 inch (about 200 mm) length of 2 inch (50 mm) pipe. The line to the column should be 3 / 4 inch (19 mm) or larger. The design should allow for the connecting line to absorb the total temperature gradient from process fluid to ambient temperature. The other connections should be 3/8 inch (9 mm) or larger. The materials of construction should be the same as the materials in the column, or equivalent materials must be selected for valves, nipples and pressure-tap lines that can withstand the column operating conditions.

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AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation by American Institute of Chemical Engineers (AIChE)


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