Correct method and safe operation steps for sewage system leakage and leak detection

Correct method and safe operation steps for sewage system leakage and leak detection

The purpose of the sewage system to remove pollutants is to remove dirt from the refrigeration system to prevent dirt from entering the compressor and the throttle valve. If dirt enters the compressor, it will cause the cylinder to be pulled and the valve plate to be tightly sealed, which will affect the normal operation of the compressor. If dirt enters the throttle valve, it will cause dirty blockage. Although each equipment and pipeline has been derusted and blown before installation, during the whole system installation process, many pipelines will have some weld slag, iron filings and dust falling from the weld to the pipe during welding. Whole system sewage can further remove dirt.

First, the sewage system sewage

1. The equipment piping of the refrigeration system must be drained before operation to remove the welding slag, iron filings, sand and other dirt remaining in the system during the installation process. Prevent dirt from damaging the components of the chiller and the valves in the system to avoid system blockage.

2. When the ammonia refrigeration system discharges the sewage, the compressed air can be supplied by the air compressor or the ammonia refrigerator. The pressure of the compressed air generally does not exceed 0.6 MPa. The sewage outlet should be set at the lower part of the pipe, and the sewage discharge work can be grouped and segmented.

3, the sewage is generally not less than 3 times, until the exhaust gas does not carry water vapor, oil and rust and other debris.

4. In order to effectively utilize the explosive force of the compressed gas and the high-speed airflow, a valve can be installed on the sewage outlet, and the valve is quickly opened when the pressure in the system rises, so that the gas is quickly discharged and the dirt is taken out. Correct method and safe operation steps for sewage system leakage and leak detection

5. In practice, the cork can also be blocked by a wooden plug. When the system has a certain pressure, the cork is unplugged and the air is quickly discharged. This method is very good. However, there is a certain danger. Be careful when handling and pay attention to safety.

6. The sewage of the Freon system is also carried out after the system is installed. The 0.6 MPa nitrogen is used for the segmental blowdown. The method and test of sewage discharge are the same as the ammonia system. The freon system cannot use compressed air during the sewage and pressure test. The compressed air contains water vapor. If it remains in the Freon system, it will cause ice plugging or ice plugging in the Freon system.

7. In the process of sewage discharge, if there is obvious leakage of the pipe flange valve, it should be remedied in time. After the system is drained, the valve plug and filter of all valves of the system should be removed and cleaned.

Second, the refrigeration system sewage and leak detection safe operation steps

1. Connect the pressure reducing valve to the nitrogen bottle, and connect the nitrogen bottle pressure reducing valve with the system ammonia valve with a nitrogen tube;

2. Open all valves in the system except the valves that connect to the atmosphere;

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

4. Close the ammonia-adding valve and the nitrogen valve, and use a brush to stain the soap, water or detergent to all the joints, pipe joints, flanges, valves, etc., and seal the joints for leak detection;

5, find the leak point, mark the mark, find a batch of leak points, the operator is located in the safe position of the sewage operation to unscrew the screw plug in the lower part of the low-pressure circulating liquid reservoir (or gas-liquid separator), draining and releasing nitrogen;

6. To make up the leak, screw on the screw plug of the low-pressure circulating liquid reservoir (or gas-liquid separator), refill with nitrogen, and the operator is in the safe position of the sewage operation to unscrew the screw plug in the lower part of the intermediate cooler to discharge the sewage and release nitrogen;

7. Repeat the previous two steps until there are no leaks;

8. Close the low pressure circulating liquid reservoir (or gas-liquid separator) inlet valve and drain valve, close the drain bucket outlet valve and drain valve, compressor suction valve and drain valve, and fill the system with nitrogen to High pressure part test pressure;

9, the high pressure portion of the leak, to identify the leak, the post-cursor symbol to identify a number of leaks, the operator situated in any position of safe operation unscrewing the lower portion of the tub drain plug, and release nitrogen blowdown; cooling system blowdown , correct method of leak detection and safe operation steps

10. Make up the leak, screw on the screw plug of the drain barrel, refill with nitrogen, and the operator is in the safe position of the blowdown operation to unscrew the screw plug at the lower part of the high pressure reservoir, draining and releasing nitrogen;

11. Repeat the previous two steps until there are no leaks.

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