Once the major feasibility issues and alternatives have been evaluated and established, specifications need to be developed. These specifications provide a definition from which the primary equipment or system will be designed and by which that equipment will be integrated into the overall plant.
Specifications can vary in detail but as a minimum, performance and functional requirements must be defined. The basic design is derived from the functional requirements of the application. The equipment designer needs to know the key characteristics of all major system inputs and all performance output requirements. This information is essential for setting vital system design parameters such as size, capacity, materials, equipment redundancy level, etc.
The design specification for new or replacement steam generating equipment should include at least the following information:
The specification should also define how the equipment will be integrated into the overall system. The following is a list of typical project definitions that should be included in a specification to an equipment supplier:
Beyond these items, it is usually appropriate to only specify material and workmanship quality requirements, allowing potential suppliers to apply their experience and knowledge to propose the most dependable and cost-effective design which meets the criteria set forth in the overall requirements.
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