Design process flow diagram

Conceptual design Process flow diagram Process FMEA/HAZAN... 

Once the candidate corrective measure alternatives have been identified, a more detailed evaluation of each alternative needs to be undertaken. From an engineering perspective, the first step in the evaluation process would include the development of a conceptual design for each alternative. The conceptual design would consist of a process description, a process flow diagram and a layout drawing. Preliminary sizing of equipment and utility and land requirements would be developed. In addition, chemical requirements and residuals produced can be estimated. From the conceptual design, permitability and residuals disposal issues can be identified and addressed. 

Process flow diagrams are more complex and show all main flow streams including valves to enhance the understanding of the process as well as pressures and temperatures on all feed and product lines within all major vessels and in and out of headers and heat exchangers, and points of pressure and temperature control. Also, information on construction materials, pump capacities and pressure heads, compressor horsepower, and vessel design pressures and temperatures are shown when necessary for clarity. In addition, process flow diagrams usually show major components of control loops along with key utilities. 

The process flow diagram, or PP D. is a pictorial description of the process. It gives the basic processing scheme, the basic control concept, and the process information from which equipment can be specified and designed. It pror ides the basis for the der elopment of the P l diagram and also serves as a guide for the plant operator. The process flow diagram usiuilly includes... 

Figure 16.4 Process flow diagrams for major hydrocracker designs.

So far 14 plants of two stage electrostatic desalters have been installed. Figure 7 is a process flow diagram of a typical installation showing the main equipment. Each plant has been divided in two parallel trains of equal capacity and only one process train has been shown ir. Figure-7. The design data is listed in Table-I and the major plant components are Hated below ... 

Initial Sketch. Figure 2 shows a process flow diagram for a petrochemical plant (1,2). This drawing shows the feed and products so the designer knows what to allow for these lines in the interunit pipeway routing. The process engineer has indicated with notes which pieces of equipment will be located in elevated structures, such as the overhead condensers, and has also shown which equipment should be located close by other equipment, such as the reboiler next to its column. Primary instrumentation is shown to indicate that room is required for instrument drops to these control valves. All this... 

The 60-percent design specifies the detailed design basis, primary process steps, process flow diagrams, major equipment components, monitoring requirements, facility requirements (e.g., building layouts, electrical and ventilation requirements), and preliminary operational strategies. Detailed final specifications of all process components, facilities, and operations are not complete. 

When a process flow diagram for a plant is available, but before detailed design commences, Hazard Study 2 may be carried out. This is a much more creative exercise than Hazard Study 1 (which is largely concerned with data collection). The purpose of this study is to look at the process area by area and identify the particular hazards and operating situations which the process engineer must take account of in his or her design. 

A process flow diagram of the demonstration plant is shown in Figure 10. The design of the Oberhausen-Holten plant differs in two sections from that of the Montebello pilot unit. 

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