tailieunhanh - Materials Selection Deskbook 2011 Part 2

Tham khảo tài liệu 'materials selection deskbook 2011 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Overall Process System Design 3 stage. Figure is a simplified flow diagram illustrating some of the major activities and their normal sequence. From the initial idea the engineer is directed to prepare a preliminary design basis. This includes a rough flow plan a review of the potential hazards of the process and an assimilation of all available technical economic and socioeconomic information and data. At tills stage of a project often the engineer or engineers are not the final equipment designers but merely play the devil s advocate by establishing the equipment requirements. Dialog established between the conceptual design engineer and the process designer results in an initial process flow plan. From the flow plan a preliminary cost estimate is prepared many times by a different engineer whose expertise is cost estimating. Once management approval is received the design engineer s work begins. In the initial stages the design engineer will help prepare a preliminary engineering flow plan select the site and establish safety requirements. This initial project stage is often considered a predesign period which constitutes the basis of the conceptual design. Usually a collection of individuals are involved in discussions and planning. The cast of characters includes the project engineer who oversees the entire project the design engineer with whom we are most concerned safety engineer environmental engineer and perhaps a representative from management and additional support personnel. Once the overall process has been designed conceptually a more detailed engineering flow plan is prepared. This flow plan serves two purposes 1 to document the logic behind the process operation and 2 to identify in detail major process equipment including all control devices. A complete flow plan also will identify potential hazards and their consequences in addition to how they are handled. After the environmental and safety engineers have reviewed all potential hazards .

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