Equipment sizing pumps

Overall Eactor Estimates. The next level of fixed capital estimate is based on a preliminary design that includes a flow sheet, material balances, energy balances, and enough equipment design to size all of the principal process equipment, including pumps and tanks. 

The reader should refer to the chapter on pumps for more detailed calculation methods and for a description of common pumping equipment and pumping applications. The simple relationships provided here are useful in obtaining initial design specifications information in sizing a pump for an application. 

Combinations of steam jet ejectors operating in conjunction th mechanical pumps can significandy improve the overall s) stem efficiency, especially in the lower suction pressure torr range of 1 torr to 100 torn They can exist beyond the range cited, but tend to fall off above 200 torr. Each system should be examined indhadually to determine the net result, because the specific manufacturer and the equipment size enter into the overall assessment. Some effective combinations are ... 

Coastal tankers are available up to 2000 tons capacity, equipped with pumps for discharging into customer s storage. The size of the vessels to be used will depend upon local conditions and the depth of water in the approaches. 

Objective 5. Determine optimum operating parameters (i.e., water flow) and equipment sizes (i.e., pump and motor sizes). 

Major equipment factor estimates. Major equipment factor estimates are made by applying multipliers to the costs of all major equipment required for the plant or process facility. Different factors are applicable to different types of equipment, such as pumps, heat exchangers, and pressure vessels. Equipment size also has an effect on the factors. 

As already described, the close coupled showerhead in OVPD enables homogeneous distribution of the organic gas phase and two-dimensional scalability (Table 9.1, no. 2) suitable for deposition on larger substrates. Conventional VTE operates with a point source, which is placed about the same distance from the substrate as the substrate diagonal to achieve the desired layer uniformity. This three-dimensional approach in VTE dramatically increases the equipment size and pump-down time to high vacuum, obviously limiting the scalability of VTE equipment. 

Size of equipment as a function of the average horsepower of process equipment motors (pumps, agitators, compressors). 

For pipe sizing, process equipment sizes are required. These include types and sizes of vessels, heat exchangers, pumps, compressors, intercoolers, scrubbers, silencers, floor space of lube and seal-oil console, furnace and heater details, control and switch house arrangements. 

Very small pumps, in-line or vertical pumps, are usually adjacent to their suction vessel. With many pumps taking suction from the same vessel (a crude fractionator, for example), adjacent pump location is possible with only four or six pumps. For a great number of medium or large-sized pumps, road access must be provided. It is advantageous and economical to have a common road to all the pumps in the plant for convenient operation and maintenance. Too many dead-end access roads between process equipment lengthen the yard bank. 

The blue boxes to the left of each item in the list indicate the Project Components. The yellow arrows inside the boxes indicate that the equipment item was obtained from the mapping of a process simulation unit, whose name appears after its box. Note that by default Aspen IPE lists all of the equipment items in the Workbook Mode, as shown above. The List tab at the bottom of the Main window denotes that the equipment items are listed in the Workbook Mode. Also note that user-inputted equipment items, such as a reboiler pump (not included in the above frame), are represented in the Workbook by blue boxes without the yellow arrow. To add these equipment items, see the section Adding Equipment. The OK in the Status column of the Workbook indicates that the minimum required information for costing the equipment is available. When one or more items are missing, a question mark appears instead, alerting the user to provide a specification(s) so that the equipment-sizing step can proceed. 

After the parameters for estimating equipment sizes and the utility parameters are adjusted, and a new steam utility is defined, the simulation units (blocks, modules, or subroutines) are mapped into Aspen IPE. In this case, there is only one distillation unit, Dl, to be mapped. The default mapping results in (1) a tray tower, (2) a shell-and-tube heat exchanger with a fixed tube sheet for the condenser, (3) a horizontal drum for the reflux accumulator, (4) a centrifugal reflux pump, and (5) a kettle reboiler with U tubes. 

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