What is the three-checks and four-fixes method?

The “three inspections” refer to checking for design omissions, identifying potential issues in construction quality, and examining unfinished work. “The “four fixations” refer to assigning tasks for the problems identified, determining the units and personnel responsible for addressing them, specifying the measures to be taken, and setting deadlines for making corrections.

“The “three inspections and four determinations” refer specifically to: checking for omissions in the design, checking the construction quality, and checking unfinished projects； Define the process, the plans and measures, the operators, and the timeline. Check for design omissions: Conduct a final review of the design and construction drawings based on the actual conditions on site, to identify any design omissions and determine whether additional design work or improvements are necessary ； Check the construction quality: First, verify whether the installation of process equipment and pipelines is in line with the design drawings, then conduct a thorough inspection of the overall appearance quality. Any issues that require correction should be identified in writing and immediate action taken to address them. For the internal inspection of construction quality, it is required to check the quality certificates of the installation materials and welding materials, the welding procedure qualification reports, the non-destructive testing reports for pipe welds, as well as the reports on the purging and pressure testing of the pipeline system ； Check unfinished projects: Conduct on-site inspections to identify which items are supposed to be completed according to the construction schedule but have not yet been finished. Define the process: A detailed, accurate, and feasible manufacturing process must be established, with absolute certainty required throughout its implementation. Formulate plan measures: Based on the process flow diagram, develop a plan that includes each piece of equipment and each pipeline. Designate operators: Determine the organizational structure and operators to ensure unified planning and command. Set a time: Determine the specific date and time.

“The “three checks” refer to checking for missing items in the design, assessing the quality of the work and any potential hazards, and examining the amount of work that remains unfinished. The “four determinations” mean that for the problems identified, tasks, responsible persons, deadlines, and measures must be established to ensure they are resolved within a set time frame.

Tasks that must be properly carried out in project construction

Here are some tips regarding common issues that arise when installing new devices: directional valves can be installed in the wrong direction, as can check valves, globe valves, and similar types. Some branch pipelines and main pipelines may be lacking isolation valves. After a bag-type shutdown, the pipeline cannot be emptied completely. When some individual units are newly constructed, the frame support structures of certain equipment block the reserved flange openings, such as in the case of vertical reboilers. Design. These are all common