Project design is divided into several stages, and what are their roles?

reply: 1. What is engineering design? Engineering design refers to the work in which the designer prepares the planning, drawings, data and other technical documents required for construction, installation and equipment manufacturing in order to specifically realize the technical and economic requirements of the proposed project based on the approved design brief before the construction of the project begins. 2. In the design stage, the design of general industrial projects and civil construction projects is carried out in two stages: preliminary design and construction drawing design, which is called "two-stage design".” ； For projects that are technically complex and lack design experience, they can be carried out in three stages: preliminary design, technical design and construction drawing design, which is called "three-stage design". 3. Preliminary design The preliminary design is a preliminary design document prepared based on the approved feasibility study report or design brief. The preliminary design document consists of four parts: design instructions (including general design instructions and design instructions for each major), design drawings, main equipment and material lists, and project budget estimates. 4. Construction drawing design Construction drawing design is a design document prepared for construction and installation based on the approved preliminary design or design plan. The construction drawing design content is mainly based on drawings, and should include cover, drawing catalog, design description (or home page), drawings, project budget, etc. 5. The difference between preliminary design and construction drawing design. The main differences between preliminary design and construction drawing design are:: ①The design depth is different, and the construction drawing design is more specific and operable. ； ②The preliminary design is the basis for the preparation of construction drawings. At the same time, the issues raised during the preliminary design review and the issues left over from the preliminary design should be corrected and improved in the construction drawing design. ； ③The preliminary design stage prepares the investment budget, while the construction drawing design stage prepares the construction drawing budget.

Supplement to the upstairs: For the design of purchasing foreign process packages, it should be divided into basic design and detailed design. Basic design is the stage of engineering foreign process packages, determining each professional design plan, preparing preliminary PID, conducting pipeline research and modeling, preparing inquiry documents for major equipment, ordering key equipment, etc. This is mainly to lay the foundation for detailed design. In the later stage of its design, preliminary design documents can be prepared for domestic use. * * department review ； The detailed design stage is the domestic construction drawing design, which mainly deepens the basic design content into construction drawings that can guide the construction, and completes the procurement of the remaining equipment and all materials. ；

What the people above have said is very good. I would like to add that foreign and domestic design follow two different lines. If the latest technology and process equipment is imported from abroad, there is another stage before basic design and detailed design, which is the FEED stage, that is, Front End Engineering Design.

The FEED stage includes the preliminary design stage and part of the detailed design stage. That is to say, the foreign FEED stage is deeper than the domestic preliminary design stage, but it is not as detailed as the detailed design.

Normally divided into two stages, the colleagues above explained it very well! ! I will briefly describe the drawings made during these two stages of work.: 1. Basic design drawings: equipment layout drawings, piping study drawings, pipeline node diagrams, etc. 2. Detailed design drawings: Equipment floor plan, equipment vertical layout, device area division plan, pipeline layout and details, heat tracing pipeline system diagram or layout diagram, pipeline support and hanger diagram, special pipe fitting diagram, etc. In fact, these tasks also include many documents and tables, which will not be discussed here.

Divided into three stages: preliminary design, technical design and construction drawing design

There is no standard division of stages. They are all based on Party A's requirements and the progress is made.

Please ask me upstairs: In foreign design packages, is there so-called Concept Design? ?

Why is it divided into two steps? Why is it divided into only two steps? What are the advantages of this division?

The initial design does not need to be too detailed. After the preliminary design is completed, the owner should organize a drawing review. After that, the content determined in the preliminary design should not be changed too much. This will facilitate project control and save costs. Designing in too many steps will be costly. ；