What are the requirements for a boiler hydrostatic test?
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Conditions required for the boiler hydrostatic test: 2 U1 ~8 c$ A. x, Q 1. All installation work on the pressure-bearing components must be completed, with corresponding inspection records and certifications available (including welding, post-weld heat treatment, weld inspection, ball testing, and the installation of supports for the heating surface tubes). 2. Check the opening and closing positions of all valves on all pipes in the soda water system to ensure they meet the requirements for the hydrostatic test. ; q8 X, |$ K7 J! u0 W& j 3. Check the expansion gaps and expansion directions in various parts of the heating surface system, as well as inspect the expansion indicators. 4. Systems such as water supply, pressure boosting, water discharge, and air release have all been installed; test pressure gauges and valve accessories are fully in place and have passed inspection. ' U: d& v6 U+ ~- b' L s 5. The safety valve is not included in the testing and should be blocked with a plug. 6. The pipes used for hydrotesting must be thoroughly cleaned. 7. Defects in manufacturing equipment must be resolved. 8. The water pumps and pipes required for hydrostatic testing must be available in sufficient quantity, and demineralized water should be used. / r Z/ {; I# y2 N1 F) Z 9: Spectral analysis within the metal detection range, with all necessary analysis procedures completed. 10. Contents and specifications for hydrostatic testing. Please add more.
1. The installation of the boiler’s steel structure and rigid beams must be completed, especially the load-bearing beams； High-strength bolts must be tightened. 2. Platforms at each level must be installed; if not fully installed, scaffolding should be set up. 3. The sealing welding at the four corners of the furnace chamber must be completed; no further welding work may be carried out on the pressure-bearing pipes after pressure testing. 4. Before applying water pressure, test for air tightness using compressed air; after fixing the major leaks, the time required for water pressure testing can be reduced.
1. The construction of the boiler furnace frame is complete; the high-strength bolts have been tightened to the specified values as per the design requirements, and the relevant visa has been processed. The deflection of each main girder before water ingress has been measured and recorded. 2. The platforms, railings, and escalators within the scope of the hydrostatic test have been installed; the passages are unobstructed, meeting the requirements for hydrostatic testing. All welds to be inspected within this scope have been completed, undergoed visual inspections, passed non-destructive testing, and come with complete records of heat treatment. 3. The installation and acceptance inspection for the pressure-bearing components and parts of the boiler itself have been completed. 4. The installation and welding inspections of non-pressure components that are directly welded to the pressure-bearing components, such as insulation hooks, door openings, support frames, and sealing elements, have been completed, and they have passed the acceptance tests. 5. All suspension rods for the pressure-bearing components of the boiler have been installed; they have been adjusted and tightened to ensure even stress distribution (the spring hanger limits remain in place), and they have passed the inspection. 6. The expansion gaps and directions of all pressure-bearing components meet the requirements specified in the drawings. 7. Thermal measurement points (including wall temperature) and instruments have been installed, and the spare holes have been sealed with welding completed. 8. The safety valve is locked, meeting the water pressure requirements. 9. The expansion indicator provided by the boiler factory has been installed in place, and the pointer has been adjusted to zero ； The pressure test gauges, having passed calibration, have been installed (one each at the separator and reheater outlets) ； The thermometer has been installed. 10. Remove and grind the temporary reinforcement elements within the water pressure range, clean up all debris, ensure the passages are unobstructed and well-lit, and set up a sturdy and complete scaffolding for inspections. 11. The water pressure and quality of water for the temporary system meet the requirements, and the booster pump has been installed and calibrated properly. The temporary pipeline systems for water supply, pressure boosting, and heating have been flushed and are ready for use. The valves that require labeling are properly labeled, with clear operation markings; the hydraulic test system diagram and the pressure rise and fall curves are displayed on site. 12. Use walkie-talkies for communication between the standard pressure gauge and the booster pump station (with spare batteries on site), and have lighting equipment such as flashlights ready for inspections. 13. Design changes to pressure-bearing components within the specified water pressure range; equipment defects have been resolved and passed inspection. 14. Temporary insulation inside the furnace chamber and on the temporary heating pipelines has been completed. 15. The organizational structure and role allocation for the hydrostatic test have been finalized. 16. The discharge of wastewater after the hydrostatic test shall meet environmental protection requirements.
In addition to the points mentioned by those upstairs, the following conditions must also be met: 1. The pressure-bearing components such as the boiler drum and header boxes should be internally cleaned and their surfaces inspected； 2. Check that the water wall, convection tube bundles, and other tubes are unobstructed ； 3. There should be no less than 2 pressure gauges installed, and their accuracy class should not be lower than 2.5. For boilers with a rated working pressure of 2.5 MPa, the accuracy class should not be lower than 1.5. The pressure gauge must pass calibration; its dial range should be 1.5 to 3 times the test pressure, with 2 times being the preferred value. 4. Drain pipes and vent valves should be installed.
1 The expansion indicator provided by the boiler factory has been installed, and the pointer has been adjusted to zero； The pressure test gauges, having passed calibration, have been installed (one each at the separator and reheater outlets) ； The thermometer has been installed. 2 Within the specified water pressure range, the temporary reinforcement elements shall be removed and polished; all debris shall be cleared away to ensure clear passages and adequate lighting. The scaffolding used for inspections shall be properly installed and in good condition. 3 The water pressure and quality of the water used in the temporary system meet the requirements, and the booster pump has been installed and calibrated properly. The temporary pipeline systems for water supply, pressure boosting, and heating have been flushed and are ready for use. The valves that require labeling are properly labeled, with clear operation markings; the hydraulic test system diagram and the pressure rise and fall curves are displayed on site. 4 Use walkie-talkies for communication between the standard pressure gauge and the booster pump station (with spare batteries on site), and have lighting equipment such as flashlights ready for inspections. Design changes to the pressure-bearing components within the 5 water pressure range have been made; equipment defects have been resolved and approved upon inspection. 6 The temporary insulation inside the furnace chamber and the temporary heating pipelines has been completed. 15. The organizational structure and role allocation for the hydrostatic test have been finalized. 16. The discharge of wastewater after the hydrostatic test shall meet environmental protection requirements.