Equipment Selection and Sizing

Process Conceptual Design Equipment selection and sizing Inventory of process Single vs. Multiple trains Utility requirements Overdesign and flexibility Recycles and buffer capacities Instrumentation and control Location of plant Preliminary plant layout Materials of construction As above plus equipment suppliers data, raw materials data, company design procedures and requirements... 

Chapter 2, Production and Capital Cost Estimation, only contains the essentials of chemical-engineering economics. Many students learn other aspects of engineering economics in a separate course. Rather than placing this chapter later in the book, it is placed here to show the student how equipment influences the production cost. Chapter 2 describes cash flow and working capital in a corporation. This chapter also describes the components of the production cost and how to calculate this cost. Finally, this chapter describes the components of capital cost and outlines a procedure for calculating the cost. Most of the other chapters discuss equipment selection and sizing needed for capital cost estimation. 

Table 7-4 provides rough guidelines for applications in the laminar and turbulent flow regimes. Equipment selection and sizing should be based on application engineering to meet specific process requirements. 

This chapter provides information about equipment selection and sizing for removing suspended sohds and dissolved gases from water. The water s source affects the types and amounts of contaminants in the water. For example, produced water will be contaminated by some hydrocarbons. 

When selecting and sizing compressors, care should be taken in determining which standard has been used to rate a compressor under consideration, particularly if the compressor has been produced abroad. All further discussions in this section will utilize only the API Mechanical Equipment Standards standard atmosphere. 

The following section covers the general aspects of solvent losses by crud its formation and characteristics and its treatment and prevention. Losses attributed to emulsion and crud formation, can in part be related to (1) nature of feed (2) reagent choice (3) equipment selection and (4) method of operation, such as the droplet size, continuous phase, excessive turbulence, etc. 

Trie previous installment in this senes, wtuch appeared In World Oil last March, inventoried waste water treating equipment installed downstream of the free water knockout. This installment adds another piece of equipment to the list—SP packs that can substitute for plate coalescers in some applications—and details how equipment is selected and sized to meet project requirements. Authors divide the design process into simple, easy-to-folow steps and demonstrate the procedure with an example problem. 

It is desirable to bring information included in earlier installments of this series into a format that can be used in selecting and sizing individual pieces of equipment needed for a complete water treating system. Federal regulations require that produced water from the free water knockout receive at least some form of primary treatment before being sent to a disposal or skim pile. Deck drainage may be routed to a properly sized disposal pile that will remove free oil. 

Again, it should be emphasized that SRVs must be selected by those who have complete knowledge of the pressure-relieving requirements of the system to be protected and the environmental conditions particular to the specific installation. Selection should not be based on arbitrarily assumed conditions or incomplete information. Valve selection and sizing (or sizing verification) is the responsibility of the system or process engineer and the user of the equipment to be protected. If unsure, seek professional guidance. 

Select a 10-gpm positive displacement pump, carbon steel construction. A summary of the equipment needs for the alkylation unit in this preliminary process design is presented in Table 1. The preparation of similar equipment lists for the other process units completes the equipment selection and design phase of the preliminary design. Figure 2-5 shows a simplified equipment diagram for the proposed process and includes the specified size or capacity of each piece of process equipment. 

Selecting and sizing equipment to perform a single process step is an easy step in process design when the temperature, pressure, and composition of the streams are known. It is much more difficult to find the operating conditions of all the streams to and from each piece of equipment when they are connected to form a continuous flow process. The overall plant optimization calculations get progressively more difficult as the number of process steps increase and constraints on process streams are added to meet all the design objectives for the plant. 

General Criteria and Methods for Selecting and Sizing Agglomeration Equipment... 

Section 16.11 Rules of Thumb for Selection and Sizing Equipment... 

Evaluate transportation routes, dehvery timing, and equipment selection (container size and type). 

To dissolve the stabilizing agent, the use of cosolvents such as carbon disulfide, carbon tetrachloride, acetone and ether is in current practice. For specific examples of oil/water separations and for further details about the use of dissolved air floatation, deep bed filtration, and the selection and sizing of various equipment, the interested reader is referred to ref. (46). 

Process Flow Diagram, Equipment Selection, and Equipment Sizing... 

Throughput consideration. The pound per hour consumption of individual machines and of a plant in total is a major determinant in the selection and sizing of almost all auxiliary equipment under discussion. 

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