When and under what conditions, the hydraulic pressure test, the main steps of the water pressure test, there are many techniques and techniques.
With many years of boiler experience, FANGKUAI Boiler has summarized the following dry goods for your reading and reference.
First, When do you need to carry out boiler water pressure test?
1. When the newly installed boiler is put into operation.
2. When the boiler that has been out of service for more than one year is restored to operation.
3. After the boiler is rebuilt and the pressure components are repaired or replaced, if the number of water wall replacement tubes is more than 50%, the superheater, reheater, economizer and other components are replaced in groups, and the steam drum is undergoing major repairs. Time.
4. When the boiler is overpressured to 1.25 times working pressure and above.
5. When the boiler is seriously deficient in water and the heating surface is deformed in a large area.
6. According to the operation situation, there is doubt about the safety and reliability of equipment operation.
Second, the boiler water pressure test method
1. The water pressure test should be carried out when the ambient temperature is higher than 5 °C. When it is lower than 5 °C, anti-freezing measures must be taken.
2. The water used for the hydraulic test should be kept above the ambient dew point to prevent condensation on the surface of the boiler. It may be confused with the inconsistency of water seepage and increase the inspection difficulty. However, it is not suitable for the temperature to be too high to prevent vaporization. (It is difficult to find the leak) and excessive temperature difference stress, generally 20 ° C ~ 70 ° C.
3. After the water is full, gradually increase the pressure to 0.4MPa, that is, perform a strict inspection. If necessary, tighten the bolts of the flange, manhole door and hand hole cover.
4. During the water pressure test, the water pressure should be slowly raised and lowered. When the water pressure rises to the working pressure, the pressure should be suspended, check for water leakage or abnormality, and then boost to the test pressure for 20 minutes. There is no drop, that is, it is reduced to the working pressure for inspection.
5. Any leaks should be recorded to reduce the pressure to atmospheric pressure.
The above is the skill that FANGKUAI Boiler needs to master when comparing the more comprehensive boiler water pressure test. I hope it can help you.
