The difference between basic design and detailed design of a project
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\"SPMP-STD-EM2003-2016 Requirements for the design of foundation works in petrochemical plants\" and \"SPMP-STD-EM2005-2016 Requirements for the detailed design of petrochemical plants\" – after comparing the instrumentation-related sections of these two standards, it seems that there aren’t any significant differences. Does anyone from a design institute know? Could you please explain what the key aspects of instrument design are during the foundation design and detailed design phases? What are the differences in the design materials produced?
In general, the basic design involves determining various technical solutions and preparing the various design documents for ordering； The detailed design documents are intended for construction and installation; therefore, the detailed design must be further developed and refined based on the order specifications. I work in process engineering; as for the specific requirements for instrument design in these two stages, it’s up to Instrument Haiyou to respond.
1. The design stages are different; the preliminary design comes before the detailed design. II. The design content, depth, and purpose are different. During the basic engineering design phase, all technical principles and solutions must be determined ； The depth of the basic engineering design documents should be sufficient to meet the requirements for owner review, preparation for the procurement of construction materials and site preparation, as well as for carrying out detailed engineering design. The detailed engineering design documents are prepared on the basis of the basic engineering design, and their content and level of detail should meet the requirements for the procurement of general materials, equipment manufacturing, construction of the project, and the commissioning of the installation. Detailed design involves providing all the detailed drawings and documents required for construction, to serve as a basis for building. III. Refer to Appendix HGT 20636.3-2017, Specifications for the Professional Design Management of Automation Systems in Chemical Plants – Tasks in the engineering design related to automation systems. IV. At present, many projects make use of mature process packages, and design institutes have relevant experience; meanwhile, clients demand short design timelines, which sometimes leads to what is known as a one-step design approach, in which the basic design and the detailed design are carried out simultaneously. The design speed was increased, which in turn led to imperfect designs. In particular, for the design documents of control systems, units, and complete sets of equipment, the design institutes fail to digest and absorb them, opting instead to use the manufacturer’s documents directly. This also leads to the misunderstanding that there is little difference between basic design and detailed design.