Thread Content
During the detailed design phase of petrochemical projects, it is generally divided into 3 stages: 30%, 60%, and 90%. At each stage, the design institute conducts a model review with the client; the depth and focus of these three reviews vary. Below, we will discuss the required level of detail for the models at each stage as well as the key aspects that are focused on during the reviews. I. 30% model review The main purpose of the 30% model review is to determine the layout of the main process equipment, the layout and stress of important process pipelines, as well as the arrangement of large pipelines. Materials required at this stage include: the initial PID, the initial layout drawings, the initial general layout plan, equipment diagrams or equipment specifications, a table of pipe material grades, and a table of pipe properties. Elements that the model needs to include: the main equipment models, all large piping systems (main circulating water pipes, main steam pipes, important process pipes, etc.), areas designated for equipment maintenance, preliminary models of the building structure, frames, and pipe racks, an initial layout of the main electrical and instrumentation trays, stress calculation results for important process pipes and steam pipes, etc. Key points for model review: Whether the layout of the main equipment is appropriate, the maintenance space, and whether the equipment frames are suitable ； The main process pipelines, whether the layout of the large pipes is appropriate, etc. II. 60% Model Review The 60% model review is the most important of these three reviews. While the 30% review mainly involves confirming the plan, the 60% review is more thorough and comprehensive; aside from a few issues that do not affect the timeline, most problems need to be resolved during this review. The results of the 60% review also determine whether the project can be completed on schedule with high quality. Purpose of 60% model review: To reconfirm the equipment layout, check whether the route of the main pipelines is appropriate, whether there is sufficient operating space for equipment valves, etc., whether the process requirements are met in the design, whether the stress on the main pipelines is within acceptable limits, as well as the layout of structures, platforms, and instrument and electrical trays. Requirements for 60% model review: P&ID, equipment layout drawings and general plans, equipment diagrams, civil and structural drawings, flow meter data, control valve data, data on special pipe fittings, safety valve data, data on other instruments, pipeline index tables, etc. Conditions that the model must meet: Device model ； Main pipelines ； Structural model ； Operation channel and platform ； Electrical instrument tray ； Instrument electrical junction boxes, etc ； Stress bracket ； Venting range simulation ； Nozzle orientation diagram ； Stress calculation results ； Building model ； Structural and equipment foundations. Main contents of 60% review: Models related to review and operation, construction, safety, etc ； Review all vent pipe models and routes ； Inspect the operability of facilities that require operation, such as valves, as well as the operation platforms ； Check whether the main pipeline route meets the requirements ； Check whether the requirements of the process are met ； Check whether Party A’s requirements are met ； Check whether the space of the operational passages and escape routes meets the requirements ； Inspect the equipment core-pulling mechanism and the lifting space for the equipment. III. 90% Model Review The 90% review is conducted before the generation of the drawings; in addition to checking the 60% of comments, it is also necessary to verify each element to ensure it matches the P&ID, as well as to check the pipes used for starting up and shutting down the system, as well as various operational aspects. Conditions that 90% model review should meet: P&ID ； Final version of equipment diagram ； All instrument, valve, and special part specifications. Depth of the 90% model: all devices ； All pipes ； All structural models ； All channels, maintenance spaces, and operation platforms ； Electrical instrument tray ； Instrument electrical junction box ； Pipeline support and hanger model ； Building model ； There should be no real collisions. 90% model review content: Apart from the 60% of comments, the other review contents are basically consistent with those of the 60% review.