“\"Three Checks and Four Fixes\" Inspection Checklist

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“\"Three inspections and four determinations\" mean checking for missing items in the design, assessing the quality of the work and any potential hazards, as well as identifying unfinished work. For the problems identified, tasks, responsible persons, deadlines, and measures are determined. Below is a detailed inspection checklist for the three checks and four determinations, for reference. I. Check for design omissions (1) Process section: Verify that the process flow for each unit operation is consistent with the design documents, and ensure that there are no missing processes or steps. Check whether the material flow direction is correct, and whether there is any backflow or dead zones. Verify whether the settings of process parameters are reasonable, such as temperature, pressure, flow rate, etc. Equipment selection verification checks whether the specifications and models of the main equipment meet the design requirements, and whether their performance satisfies the process needs. Check whether the material of the equipment is suitable for the properties of the process medium, and whether there is a risk of corrosion. Verify whether the configuration of the backup equipment is appropriate and whether it can be put into use promptly in emergency situations. The pipeline system is inspected to ensure that the pipe diameter and wall thickness meet the design requirements, and that the pipes can withstand the expected pressure and flow rates. Check whether the piping connection methods, such as welding and flange connections, are correct. Verify that the labeling on the pipes is clear and accurate, including information such as the type of fluid and the flow direction. Inspect the valves and instruments to check whether their type and specifications meet the design requirements and whether they operate smoothly. Check whether the installation position, range, and accuracy of the instruments are correct, as well as whether the signal transmission is stable. Verify whether safety devices such as safety valves and rupture discs are properly installed and have been calibrated. (II) For the electrical part’s power supply and distribution system, check whether the specifications and models of the power supply lines meet the design requirements, and whether the grounding is reliable. Check whether the parameters of electrical equipment such as transformers and switchgear are correct, and whether they are firmly installed. Verify that the protective devices of the electrical system are complete, such as overcurrent protection and short-circuit protection. The lighting system checks whether the arrangement of the lighting fixtures is appropriate and whether the illuminance meets the requirements of the workplace. Check whether the wiring of the nuclear lighting system complies with the specifications and whether there is a risk of electric leakage. Verify that the emergency lighting system is installed in accordance with safety standards and can function properly in emergency situations. The power system inspection checks whether the motor selection is appropriate and whether its power meets the requirements for the operation of the equipment. Check whether the control methods of the motor, such as the starting method and speed control method, are correct. Verify that the cable trays and conduit systems are securely installed and that their routing is appropriate. (III) Instrument control section: Check whether the hardware configuration of the control system meets the design requirements, such as controllers, I/O modules, etc. Check whether the software functions of the control system are complete, such as control logic and alarm settings. Verify whether the communication network of the control system is stable and whether data transmission is accurate. The instrumentation equipment is inspected to ensure that its accuracy and range meet the process requirements, and that its installation location facilitates operation and maintenance. Check whether the signal type and wiring method of the instrument are correct, and whether there is any interference. Verify whether the protection rating of the instrument meets the requirements of the installation environment, such as water resistance and dust protection. The safety interlock system checks whether the interlock logic is correct and whether it can effectively prevent accidents from occurring. Check whether the safety interlock devices operate sensitively and reliably, such as emergency stop buttons and limit switches. Verify whether the test records of the safety interlock system are complete and have been validated. II. Inspection of project quality and potential hazards (I) Inspection of the structure of civil engineering buildings: Check whether the foundations of the buildings are solid, and whether there are any signs of settlement or cracks. Check whether the main structural elements of the building meet the design requirements, such as the dimensions and strength of beams, columns, floor slabs, etc. Verify whether the building’s seismic and fire resistance performance meets the regulatory requirements. Roof and waterproofing inspection: Check whether the roof’s drainage system is unobstructed and there is no water accumulation. Check whether the quality of the waterproofing materials and the construction methods meet the requirements, and whether there are any leaks. Check whether the roof has good insulation and heat resistance properties. During decoration inspections, check the flatness and perpendicularity of walls and floors, as well as for any issues such as hollow spots or cracks. Check whether the quality and color of the decorative materials meet the design requirements, and whether there is any contamination or damage. Check whether the doors and windows are securely installed and have good sealing performance. (II) Equipment installation: Check the equipment foundation to determine whether its dimensions and elevation meet the design requirements, and whether its strength is sufficient for the installation of the equipment. Check whether the positions and dimensions of the anchor bolt holes in the equipment foundation are correct, and whether the reserved depth is appropriate. Verify whether the quality of the secondary grouting for the equipment foundation is good, and check for any defects such as voids or cracks. Inspect the equipment itself to check whether its appearance is intact, and whether there are any deformities or damages. Check the installation accuracy of the equipment, such as levelness, verticality, concentricity, etc., to ensure they are within the allowable range. Check whether the internal structure of the device is intact, and whether there are any foreign objects or blockages. Inspection of equipment accessories: Check whether the auxiliary pipes, valves, instruments, etc. of the equipment are installed correctly and whether the connections are secure. Check whether the cooling system and lubrication system of the equipment are operating properly and whether there are any leaks. Check whether the equipment is equipped with complete safety protection devices, such as guards and protective fences. (III) Pipeline engineering – Inspection of pipeline installation: Check whether the supports and hangers for the pipelines are properly installed, and whether their spacing meets the specified requirements. Check whether the slope and slope direction of the pipeline are correct, and whether there is any reverse slope. Verify the quality of the pipeline connections, such as whether welding and flange connections meet the standards, and check for any leaks. Inspection of pipeline anti-corrosion and insulation: Check whether the anti-corrosion layer of the pipeline is intact, and whether there are any damages or peeling. Check whether the insulation material of the pipes meets the design requirements and whether the insulation thickness is uniform. Check whether the outer protective layer of the insulation layer is secure, and look for any issues such as cracks or water leakage. Piping pressure testing and purging are used to check whether the pressure testing records for the pipes are complete, whether the pressure meets the design requirements, and whether there are any leaks. Check whether the purging records for the pipelines are complete, whether the purging was effective, and whether there are any residual debris. Verify that the pipeline markings are clear and accurate, and consistent with the pressure testing and purging records. (IV) Electrical and Instrumentation Engineering: Inspection of electrical equipment installation – Check whether the grounding of the electrical equipment is reliable and whether the grounding resistance meets the required standards. Check whether the wiring of electrical equipment is correct and whether its insulation performance is good. Check whether the electrical equipment is operating normally, and look for any signs of abnormal heating, noise, or other issues. During the installation inspection of instrumentation equipment, check whether the installation location of the instruments facilitates operation and maintenance, and whether it meets the process requirements. Check whether the wiring of the instruments is correct and whether the signal transmission is stable. Verify whether the accuracy of the instrument meets the design requirements and whether it has been calibrated. During cable laying, check whether the cable routing is reasonable and whether there are any issues such as intersections or tangling. Check whether the specifications and models of the cables meet the design requirements, and whether their insulation performance is good. Verify that the cable markings are clear and accurate, and consistent with the cable inventory. III. Inspection of unfinished work volume (I) Compare the project progress with the project schedule to check the completion status of various tasks. Confirm the completed work, and verify whether the volume and quality of the work meet the requirements. Check the unfinished project tasks to determine the remaining workload and deadlines. Analyze the factors affecting project progress and formulate corresponding acceleration measures. Key milestone inspection: Check whether the key milestones of the project, such as the completion time of equipment installation, the pipeline pressure testing time, and the electrical commissioning time, have been completed on schedule. Assess the impact of delays at key milestones on the overall project timeline, and adjust subsequent work plans accordingly. Verify the arrival of key equipment and materials to ensure it does not affect the project schedule. (II) Equipment commissioning – Single-unit commissioning: Check whether the single-unit commissioning of the equipment has been completed and whether all commissioning records are complete. Verify that all performance parameters of the equipment meet the design requirements, such as speed, flow rate, pressure, etc. Analyze the problems occurring during single-machine debugging and formulate solutions. System interconnection debugging: Check whether the preparations for system interconnection debugging are complete, such as pipe connections and electrical wiring. Verify whether the plan for system integration testing is reasonable and whether the safety measures are in place. Check the progress and effectiveness of the coordinated debugging of the system, and resolve any issues that arise promptly. (III) Inspection of completion documents: Check the collection and organization of these documents to ensure they are complete and thorough. Verify whether design documents, construction drawings, change notices, etc. have been archived. Check whether the quality inspection records, test reports, acceptance records, etc., during the construction process are complete. Verify whether the as-built drawings are drawn accurately and in accordance with standards, and whether they correspond to the actual project. Review of completion documents: Examine the completion documents to ensure that their content is true, accurate, and complete. Verify that the signatures and seals on the completion documents are complete and meet the specified requirements. Analyze the problems present in the completion documents and make timely corrections and improvements. IV. Define tasks, personnel, timelines, and measures (1) Task allocation: Categorize and organize the identified problems to clarify the corrective actions required. It is classified according to aspects such as design omissions, project quality and potential hazards, and unfinished work volume. Determine the requirements and standards for addressing each issue, and clarify the difficulty level and importance of the tasks. Create a list of corrective action tasks, listing each task individually and specifying the responsible department or person. Determine the completion time and acceptance criteria for the corrective actions. Establish a problem tracking mechanism to keep track of the progress of corrective actions in a timely manner. (II) Personnel arrangement: Identify the personnel responsible for carrying out the rectification work, and clarify their responsibilities and authorities. Based on the nature and requirements of the rectification tasks, personnel with the appropriate professional knowledge and skills are assigned to handle them. Clarify the specific responsibilities of each responsible party in the rectification process, such as identifying problems, formulating plans, and carrying out the rectifications. Form a rectification task force: establish a task force composed of relevant departments and professionals to enhance coordination and cooperation. Designate a team leader responsible for organizing, coordinating, and supervising the corrective actions. Clarify the roles and collaboration methods among team members to improve work efficiency. (III) Timing: The timing for making corrections is determined based on the severity of the issue and its scope of impact. For major issues that affect the safety, quality, and schedule of the project, rectification is given priority, with the shortest possible completion time determined. For general issues, arrange the rectification time properly to ensure it is completed before the project goes into operation. Formulate a rectification work plan: Develop a detailed rectification work plan in accordance with the required time milestones. Break down the corrective actions into specific time periods, and define the tasks and objectives for each stage. Regularly inspect and evaluate the rectification efforts to ensure that the tasks are completed on time. (IV) Formulation of measures: Specific corrective measures are developed to address different issues. Regarding design omissions, communicate promptly with the design team, submit change requests, and improve the design plan. Regarding engineering quality and potential hazards, the causes are analyzed, and targeted remediation plans are formulated, such as rework, repair, reinforcement, etc. Regarding the unfinished work, proper allocation of construction resources will be used to accelerate the project progress and ensure completion on time. Ensure that the corrective measures are feasible and effective, and capable of completely resolving the issue. The corrective measures should undergo technical evaluation and review to ensure their feasibility and safety. When implementing corrective measures, it is necessary to follow relevant standards and specifications strictly to ensure the quality of the corrections. Recheck and verify the issues that have been rectified to ensure they are completely resolved.