What are the main aspects checked during the three inspections and four adjustments for the steam pipeline of a newly installed unit? What is the purpose of acid cleaning medium-pressure steam?

“The “three inspections and four determinations” refer specifically to: checking for missing items in the design, checking the construction quality, and checking unfinished projects； Define the process, plan and measures, operators, and timeline. Check for design omissions: Conduct a final review of the design and construction drawings based on the actual conditions on site, to determine whether there are any design omissions and if any supplementary design or improvements are needed ； 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 examine the quality certificates of the installation materials and welding materials, the welding procedure qualification reports, the non-destructive testing reports for pipe welds, and 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.

Pipelines that are cleaned by acid washing generally have a high level of cleanliness. Medium-pressure steam acid washing is likely used to power turbines, thereby preventing impurities in the pipelines from damaging the impellers and other components~~~~

Fuyoude Cleaning believes that @ 1, during the pickling, passivation, pre-coating, and cleaning processes, oil stains, rust, rolling scale, sediment, welding slag, iron shavings, and powdered oxides generated during manufacturing, transportation, and installation must be removed to ensure that the metal surface is clean and free of contaminants； 2. It is necessary to ensure that all tasks related to acid washing, passivation, pre-coating, and cleaning are completed within the scheduled time frame, with the system being fully restored as well ； 3. Rust and scale must be completely removed through acid cleaning; the removal rate and cleaning efficiency must be over 95%, and the cleaned surface of the equipment must be free from any residual rust ； 4. The oil stain removal rate and cleaning efficiency must be over 95% ； 5. Sediment, welding slag, iron shavings, etc. must be completely removed, with a goal of achieving a 100% cleaning rate ； 6. Requirements for pipeline equipment after water cleaning: The desalinated water discharged as a result of cleaning must be colorless and transparent; the levels of total iron, total chlorine, and other impurities should be similar to those specified for high-quality desalinated water, with a difference of no more than 2PPm ； 7. Before chemical cleaning, components and other accessories that could be damaged by the cleaning solution and thus affect normal operation should be removed or isolated ； Those that cannot be removed or isolated should not suffer damage as a result of cleaning ； 8. The cleaning process has low costs and is simple to operate; it can be completed within the scheduled time frame while meeting the required cleaning standards. It causes no pollution to the environment and does not damage the equipment itself ； 9. All residual liquids and residues inside the equipment after chemical cleaning must be removed completely; the deionized water used for washing must also be entirely eliminated. In systems that have been purged, there should be no visible water, and the water content in the gas emissions should be less than 10 ppm ； 10. The waste liquid generated during the chemical cleaning process shall not be discharged directly; a treatment plan must be proposed to ensure that the remaining liquid can be discharged in compliance with standards. 11. After acid washing, passivation, and pre-coating cleaning are completed, a practical storage plan should be established to ensure that the results of these cleaning, passivation, and pre-coating processes are not compromised.