Designated engineering representative

See Designated Engineering Representative (DER) for additional related information. 

Safety Requirements Specification The instrumentation and electrical (I E) requirements are developed to meet the intent of any H RA findings and the process requirements. The design documentation should establish a clear connection between each process hazard and the design of its SIFs. I E personnel should meet with the process engineering representative responsible for the process requirements to ensure that the intent is understood. 

Figure C-2 represents a flow sheet prepared by a junior design engineer of part of an aromatics plant which provides paraffin removal by extractive distillation with dimethylphthalate (DMP). Check this design and make recommendations concerning the design conclusions of the junior design engineer who worked on...

Although the scale parameter a is the primary characteristic value of failure in a set of samples, representing the applied field by which 63% of the samples have broken down, the shape parameter /3 is also extremely important. f3 is required in order to calculate when the first 1%, say, of samples will have failed - a more important parameter for a design engineer than the 63% figure. 

When the design engineer needs to specify a unit operation that is not represented by a library model and cannot be approximated by a simple model such as a component splitter or a combination of library models, then it is necessary to construct a user model. All of the commercial simulators allow the user to build add-in models of varying sophistication. 

These problems are intended to be representative of typical problems that a design engineer might face in industry. A shorter selection of more structured problems with more background information is given in the next appendix. 

In chemical engineering, several methodologies and procedures are applied for decision making during design processes. Representative examples include design heuristics, shortcut methods, decision analysis methods, and mathematical optimization. 

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