Process design retrofitting

Flow-sheet models are used at all stages in the life cycle of a process plant during process development, for process design and retrofits, and for plant operations. Input to the model consists of information normally contained in the process flow sheet. Output from the model is a complete representation of the performance of the plant, including the composition, flow, and properties of all intermediate and product streams and the performance of the process units. 

Adjusted hours are the home office hours that would be required by a large engineering contractor to perform a specific scope of work for a plant with normal sized equipment. They are derived from the base hours, adjusted to take into consideration the specific situation e.g., extent of process design required, type of process and instrumentation, special site conditions, extra retrofit work, existing facilities. Owner s participation, etc. 

Frameworks for examining flowsheets that account for modifications to existing processes in operations (i.e., design retrofitting)... 

The systematic methods and the analysis tools of Integrated Process Design can be applied to any type of chemical process industries, and addresses both new and retrofit projects. 

Figure 5 Plant design as the sequel to process design The ability to compress the overall time cycle to first manufacture adso depends on the extent to which process and plant design can overlap and permit earliest plant construction activity. The instance of retrofit into existing plant, although generally providing for the shortest cycle, can be adversely affected if the development and design overlaps miss an essential equipment item that is not at hand.

Conceptual Process Design for Process Retrofit/Revamp Projects... 

Carvalho, A., Gani, R., and Matos, H. (2008) Design of sustainable chemical processes systematic retrofit analysis generation and evaluation of alternatives. Process Safety and Environment Protection, 86, 328-346. 

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