Key points for reviewing professional drawings

The review of drawings for various specialties must be carried out in accordance with the process requirements; generally, the process department takes the lead while the other specialties provide support. During the drawing review, it is essential to be thorough – every valve, every elbow, and every screw must be clearly identified.

Different systems have varying requirements for drawing review; for example, there are significant differences between the power and chemical industries. It needs to be explained separately

The review for each specialty must be closely linked to the process requirements; specifically, it depends on the requirements of the respective system.

While the review of drawings for different specialties certainly involves specific characteristics and considerations unique to each field, it is also very important to carry out cross-specialty checks. For example, regarding equipment, it is necessary to check against the civil engineering foundations and anchor bolts; the manufacturing processes must be aligned with the requirements of the equipment in terms of openings, while pipes and embedded openings need to be checked in coordination with civil engineering work. Support structures need to be verified in relation to steel structure elements, and equipment parameters must be checked against those specified for instrumentation. Instrumentation systems, on their part, need to be coordinated with the manufacturing processes regarding procedures and pipe connections. In short, cross-specialty checks are essential, as failing to do so can lead to problems and the need for rework during subsequent construction.

I have indeed seen the review contents for various type of drawings; they are extremely detailed. It seems to be a requirement when applying for approval of the engineering design.

It would be good to go into more detail; if there’s any relevant information, feel free to share it! Guaranteed high scores!

1. The common issues identified through the joint review of the drawings are summarized as follows:； a Are the dimensions and elevations consistent? ； b Are there any contradictions between the professional drawings related to water, electricity, and equipment installation, as well as between the different drawing numbers? ； c Are the reserved holes and embedded parts correct and complete? ； Is the construction method clearly explained? ； Is the selection of materials appropriate, and does the design meet quality requirements? ； Do the foundation, gutters, etc. touch each other? ； Are the building plans consistent with the structural drawings? ； Are the H-standard drawings and detailed drawings correct? ； Are the decoration methods for the ceiling, walls, baseboards, skirtings, floor, etc. coordinated? ； Whether the dimensions, specifications, and quantities of the doors, windows, and components are consistent, etc. 2. Methods and key points for familiarizing oneself with drawings: Start with the overall view and then move on to details. That means first looking at the plan, elevation, and sectional views to gain an overall understanding of the project, as well as a rough idea of its total length and width, axis dimensions, elevations, floor heights, and overall height. Then examine the detailed construction methods and verify the overall dimensions against the detailed dimensions. 3. The following issues should be examined during the drawing review: (1) Architectural part: Whether there are any ambiguities or insufficient basis regarding the location of the building(s) on the overall building plan, and whether there are any discrepancies between the planned layout of the building(s) and the actual conditions on site. (2) From small to large: First, look at the sample drawings, and then the full-scale drawings, to verify whether the detailed construction methods indicated in the plan, elevation, and sectional views match those shown in the full-scale drawings ； The numbers, types, and models of the standard component catalogs used are consistent with those specified in the design drawings ； Are there any missing index symbols? ； Whether the sample drawings are complete, etc. (3) Build first, then structure: That is, look at the architectural drawings first, and then the structural drawings ； Compare the architectural drawings with the structural drawings to verify whether the axis dimensions and elevations match, to check for any discrepancies, as well as to ensure that no dimensions are missing and that there are no unreasonable design elements. (4) General first, then special: First, consider the general areas and requirements, and then those of the special areas. Special areas generally include foundation treatment methods, the installation of expansion joints, waterproofing requirements, as well as technical requirements for seismic resistance, fire protection, insulation, heat insulation, sound insulation, dust prevention, and special finishing. (5) Integration of drawings and specifications: When examining the drawings, it is necessary to refer to the general design specifications as well as the detailed notes provided in the drawings, in order to check for any contradictions between them. This includes verifying whether the regulations are clear, whether the requirements are feasible, and whether the proposed methods are reasonable. (6) Integration of civil engineering and installation: When reviewing the civil engineering drawings, it is necessary to consult relevant installation drawings as well, and check for any discrepancies between those drawings and the civil engineering designs. It is important to verify that the positions and dimensions of embedded components, pre-made holes, and grooves are consistent, and to understand the requirements imposed by the installation work on the civil engineering structure, so as to address coordination issues during construction. (7) Combine drawing requirements with actual conditions: This involves checking whether there are any aspects in the drawings that are not practical, such as the relative positions of buildings, the elevation of the site, and geological conditions, to ensure they match those specified in the design drawings ； It depends on whether construction units can implement some special construction techniques. To ensure effective review of design drawings and improve their quality, it is necessary to minimize the number of issues identified in the designs during the construction process. 4. Points to note in the work: (1) The construction party should attend the drawing review meetings with an attitude of humility, cooperation, eagerness to learn, and harmony. Provide necessary services based on the organizational and coordination capabilities of the construction entity, design firm, and supervision company, to facilitate the completion of the drawing review. (2) The records of the drawing review are part of the construction documents and have the same validity as the construction drawings; therefore, the management methods and distribution scope for these records are the same as those for the construction drawings, and they must be implemented carefully. 5. Key points of drawing review: a. Whether the construction drawings are consistent with the requirements for equipment and special materials. 　　b. Whether the design drawings are compatible with the main construction technical solutions. 　　c. Whether the level of detail in the drawings meets the construction requirements. 　　d. Whether the component division and processing requirements are in line with the construction capabilities. 　　e. Check whether the connection between the new and old plants as well as the new and old systems in the expansion project is appropriate, and whether the construction transition is feasible; in addition to verifying the drawings, it is also necessary to go to the construction site to assess the actual conditions. 　　f. Whether the designs of different specialties are coordinated, such as the external dimensions of equipment versus the dimensions of the foundations, the holes and embedded components provided in the building in relation to the requirements specified in the installation drawings, the connection points between equipment and systems, and the relationships between various pipelines. 　　g. Are there any difficulties in construction techniques, as well as in the supply of machinery and materials, related to the new structures, materials, equipment, processes, and technologies adopted in the design? 　　h. Are there any contradictions between the construction drawings, between the general and detailed drawings, or between the overall and detailed dimensions? 　　i. Whether it can meet the requirements for safe and economical operation as well as the needs for proper maintenance work. 　　j. Whether the specifications, models, and quantities of materials and equipment indicated on the construction drawings match those in the material list, and whether they are consistent with the actual conditions on site.

I work in installation, and I hope what I say will be helpful to the original poster. When reviewing the process drawings, one should first check whether the following are available: 1) Design specification manual; 2) Process flow diagram; 3) Pipe layout plan; 4) Comprehensive material list; 5) Pipeline list; 6) List of pipes; 7) Pipe rack list; 8) List of anti-corrosion and insulation measures for equipment pipes, etc. Next, check whether there are any major errors in each item. 1: In the design instructions manual, it should be clear what the various regulatory requirements and design specifications are. Are there codes for various process media, pressure ratings, as well as methods of indicating and annotations for valves and fittings? 2: Is the flowchart up to date, and does it correspond to the layout plan? 3: Does the floor plan clearly indicate the elevation and coordinate positions of the pipelines? 4: Does the comprehensive material list accurately reflect the materials required in the floor plan, including the specifications, models, materials, quantities, applicable standards, and series of those materials? 5: As per the comprehensive material table, does the pipe section table reflect the actual materials required for this pipeline? 6: Does the pipeline inventory list include all the pipelines, and does it show the flaw detection rate for each pipeline... as well as the operating temperature, pressure, design temperature, pressure, and the methods used for pressure testing? 7: Check the pipe rack table and the comprehensive material table against standard pipe rack drawings to verify for any errors. 8: Different design temperatures, as well as methods and materials for corrosion protection and insulation. . Wait to see if the explanation is clear. There are also coordination issues with various specialties. Fittings refer to large-diameter pipelines and equipment. Check for any conflicts regarding the locations of openings in the civil engineering floors, the positions of embedded iron components, concrete beams and steel structure beams, as well as the installation of equipment and pipelines. Between the equipment and piping specialties, attention is paid to the layout of the equipment connections; for non-standard equipment, it is also necessary to check whether the mating flanges provided by the process piping specialty match those of the equipment.

Between process and instrumentation, first consider the definition of design boundaries, and then conduct a review based on the actual conditions. Generally, the following aspects are checked: 1. For fittings, it is necessary to verify whether the flanges used for connecting the main pipeline control valves, flow meters, etc. match those specified in the process design. 2. It is also important to ensure that the first flange before the temperature and pressure sensors matches those required by those instruments. In the design created by our Tianchen team, it turned out that the flanges used for connecting the control valves, flow meters, and other instruments did not match those specified in the process design at all.