What are the common visual inspection items before a boiler hydrostatic test?

1. The maintenance work on the steam and water system related to the boiler’s hydrostatic test must have been completed, the pressure-bearing components of the boiler must have been repaired, and the thermal work permit must have been cancelled. There is no one working inside the boiler furnace and on its rear heating surfaces. 2. Sufficient water for the hydrostatic test has been prepared. Water for hydraulic testing should be chemically deionized water with a corrosion inhibitor added. The quality requirement is: chloride content less than 0.2 mg/L ； The hydrazine content is 200–300 mg/L ； The pH value is 10–10.5 (adjusted with ammonia water). 3. All valves are in the correct positions. 4. All supports and hangers in the boiler steam and water system have been inspected and adjusted. 5. The expansion indicators of the boiler’s main system are clear and intact. 6. Equipment defects related to water pressure have been resolved. 7. All welding work related to water pressure has been completed and passed inspection. 8. The drainage system has been completed and can meet the normal water discharge requirements of the boiler. 9. All maintenance work on the high and low pressure feedwater systems, the condensate system, the condenser, and the deaerator has been completed; all valve maintenance tasks have been finished and the valves have been reinstalled. Additionally, testing and acceptance checks have been carried out successfully. 10. The turbine condensate pump and feed water pump have been tested and are operating normally. 11. The pressure gauges for the boiler drum, superheater, reheater, and feedwater, as well as the feedwater flow meter and drum wall temperature gauge, have been accurately calibrated and installed; electric contact switches and dual-color water level gauges are in use. 12. The chemical dosing pump is operating normally. 13. There are no trash or debris inside and outside the boiler, such as on the roof, stairs, platforms, the zero-level floor, the furnace chamber, the cold ash hopper, and the horizontal flue ； The tube surfaces of the partition screens, low-temperature superheaters, economizers, water wall, encircling wall superheaters, screen superheaters, high-temperature superheaters, etc., are clean with no ash accumulation. 14. The passages, stairs, platforms, and temporary scaffolding necessary for the hydrostatic test must be in good condition and freely accessible; communication facilities and lighting must be ready, as well as the tools required for conducting the hydrostatic test inspection and the on-site lighting. 15. The organizational structure and role assignments for the hydrostatic test have been finalized, and the relevant personnel have been organized to study this plan. 16. The technical management personnel and operators involved in the hydrostatic test are familiar with the operational requirements and procedures for such tests, and the operation cards for the hydrostatic test are ready. 17. The work order for the boiler steam and water system has been submitted to the shift supervisor; no one is working on the pressure-bearing components or in their vicinity. 18. During the hydrostatic test, the ambient temperature is generally above 5 degrees. The following items should be carefully rechecked: (1) The pressure gauge and electric contact level gauge of the steam drum should be put into use ； (2) Put the pressure gauges for the superheater, reheater, and feedwater into operation ； (3) The boiler accident drain valve is powered on, the switch operates smoothly, and the drain piping is unobstructed ； (4) The boiler steam-water system has been properly isolated from the turbine.

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