Operation steps of temperature shock test chamber refrigeration unit blowdown and leak detection

Operation steps of temperature shock test chamber refrigeration unit blowdown and leak detection

The operation steps of temperature shock test chamber refrigeration unit blowdown and leak detection are as follows:

　　1, connect the pressure reducing valve to the nitrogen cylinder, and connect the nitrogen cylinder pressure reducing valve with the ammonia valve of the system with a nitrogen pipe;

　　2, open all valves in the system except the valves that communicate with the atmosphere;

　　3. Open the ammonia valve and nitrogen valve, and fill the system with nitrogen to the low pressure part of the test pressure;

　　4. Close the ammonia valve and nitrogen valve, and use a brush dipped in soapy water or detergent to smear all welds, pipe joints, flanges, valves and other connections and sealing parts for leak detection;

5. Find the leaks, mark them, and after finding a batch of leaks, the operator of the temperature shock test chamber is located at a safe position for draining operations and unscrews the screw plug under the low-pressure circulating liquid reservoir (or gas-liquid separator) , Blowdown and release nitrogen;

　　6. ​​Repair the leak, screw on the screw plug of the low-pressure circulating reservoir (or gas-liquid separator), and refill with nitrogen. The operator is at a safe position for the sewage operation and unscrew the screw plug at the lower part of the intercooler, draining and releasing nitrogen;

　　7. Repeat the last two steps until there are no missing points;

8. Close the inlet valve and drain valve of the low-pressure circulation reservoir (or gas-liquid separator), close the drain valve and drain valve of the drain barrel, the compressor suction valve and drain valve, and fill the system with nitrogen until High pressure part test pressure;

9. After detecting the leakage of the high-pressure part of the temperature shock test chamber, find out the leaks, mark them, and find a batch of leaks, the operator is at a safe position for the sewage operation to unscrew the screw plug at the lower part of the drain barrel, drain and discharge Nitrogen;

　　10. Fix the leak, screw on the screw plug of the drain barrel, and refill with nitrogen. The temperature shock test chamber operator is at a safe position for draining operations and unscrews the screw plug at the lower part of the high-pressure reservoir to drain and release nitrogen;

　　11. Repeat the last two steps until there are no missing points.