Safety procedures for sewage system and leak detection in refrigeration systems

The purpose of the sewage in the computer room refrigeration system is to remove the dirt in the refrigeration system to prevent dirt in the system from entering the compressor and the throttle valve. So what are the correct methods and detailed steps for the sewage system to discharge pollutants?

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.

I. Sewage Discharge of Refrigeration System 1. The equipment pipeline of the refrigeration system must be drained before operation to remove the 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, it is recommended that a valve (J41B-25C ammonia shut-off valve) be installed on the sewage outlet. When the pressure in the system rises, the valve is quickly opened to allow the gas to be quickly discharged. Dirt.

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 safety operation steps 1, the pressure reducing valve is connected to the nitrogen bottle, the nitrogen tube pressure reducing valve and the system ammonia valve are connected with a nitrogen tube;

2. Open all valves except the valve connected to the atmosphere (J41B-25C ammonia gas shut-off valve);

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 (J41B-25C liquid ammonia shut-off valve) and the nitrogen valve. Apply all the welding joints, pipe joints, flanges, valves, etc. to the joints and seals with a brush and soapy water or detergent. leak;

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. Check the high pressure part, find the leak point, mark the mark, find out a batch of leak points, the operator is located in the safe position of the blowdown operation, unscrew the screw plug at the lower part of the drain bucket, discharge the sewage and release the nitrogen;

10. Make up the leak, screw on the screw plug of the drain bucket, 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.

[Shanghai ammonia valve]: ammonia shut-off valve, liquid ammonia shut-off valve, ammonia gas shut-off valve, pneumatic emergency shut-off valve, hydraulic emergency shut-off valve, electric emergency shut-off valve

Small 2D LiDAR Sensor

IT02S, is JRT new product in the early 2019, which is a single-point LiDAR sensor, also called tof distance sensor. With a micro size of 46x17x7mm, customers can widely use in many Laser Measurement Solutions. The lidar distance sensor can measure 12m short-range with high frequency up to 100hz. It's great for Unmanned Aerial Systems. If you need us send you data sheet and spec for this products, offering sample as well, pls tell us, thank you.

IT02S Mini Tof Sensor Module Diagram

Parameters of IT02S: