What are the specific application scenarios of desalinated water flowmeter | Venturi flowmeter in power plants

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1. What precautions should be taken for the water pressure test of boilers in thermal power plants? The water pressure test of boilers in thermal power plants should strictly follow current industry standards such as DL/T 5075-2015 "Technical Guidelines for Water Pressure Test of Boilers in Thermal Power Plants" and DL/T 5047-2019 "Code for Acceptance and Evaluation of Construction Quality of Electric Power Construction Part 2: Boiler Units". The entire process should control the test conditions, parameters, and safety boundaries to avoid overpressure instability, medium leakage, and personal injury risks.

1. Preparation before the experiment (1) Confirmation of basic conditions 1 The installation of the boiler body and its ancillary steam and water system has been completed, and all welding joints have passed non-destructive testing. The expansion gap and support status of the heating surface and the header meet the design requirements. All temporary reinforcement facilities have been removed. 2. The testing equipment has been verified as qualified: the booster pump, pipeline, etc. have no leaks, the pressure gauge accuracy is not less than 1.6 levels, the range is 1.5~2 times the test pressure, and at least 2 pieces are arranged symmetrically at the high and low points of the system. They are regularly reported to Hongxiang for inspection and calibration. 3. The test water quality meets the standard: desalinated water or condensed water is used, and the water temperature is controlled at 20~70 ℃ to avoid thermal stress caused by excessive temperature difference between the water temperature and the metal wall. 4. The system is isolated in place: all external connections are closed. Valves, isolation safety v

alves, flow meters, pressure socks, and other vulnerable components should be installed with blind plates and hung with signs to prevent accidental operation 5. Smooth drainage channel: Confirm that the system drainage valve and drain valve are unobstructed, and that the test water can be discharged to the designated compliant area to avoid water pollution. 6. Safety protection regulations: Set up a test warning area with a radius of not less than 30m, hang a "high-pressure danger no entry" sign, assign a dedicated person to be on duty, and equip emergency communication equipment and rapid pressure relief devices. （2） Pre inspection and exhaust 1 Open all high point exhaust valves and low point drain valves of the system, slowly fill the system with water until there are no bubbles in the continuous outflow of water from the exhaust valve. After confirming that the air in the system is completely discharged, close the exhaust valve. 2. Increase the pressure at a rate of 0.1~0.3 MPa/min to 0.2~0.3 MPa, maintain the pressure for 5~10 minutes, comprehensively check the sealing of the system, and conduct formal tests only after there are no leaks or deformations.

II. Key points for controlling the experimental process 1 Strict control of pressure rise rate: During the formal pressure rise stage, the rate should not exceed 0.3MPa/min. After reaching the design working pressure, the pressure rise should be paused. After a comprehensive inspection of the header, welds, flanges, and other parts for abnormalities, the pressure should be slowly increased to the test pressure. 2. Compliance of test parameters: The test pressure for subcritical boilers is 1.25 times the design pressure, and the holding time should not be

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