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What problems should be paid attention to before starting Roots blower?

Source: Roots blower manufacturer Published on: February 17, 2022 Hits:

   Roots blower Before commissioning, the installation and commissioning preparations shall be checked, and problems found shall be solved in time until they meet the requirements. The test run is generally carried out in three steps: no-load test run, load test run and linkage test run. Sometimes, the last two can be combined into one.

1. Preparation before commissioning
Check whether the installation of fan and instrument is completed and whether the connecting pieces are loose. For Roots blower with direct drive, check whether the coupling pin nut is loose; For Roots blower with belt coupling drive, check whether the belt tension is appropriate. Use Roots blower with cooling water to check whether the water inlet valve works well and whether the waterway is unblocked.
2. Check whether the lubricating oil brand meets the requirements and whether it has been added to the specified oil level. There are usually two scale marks on the oil pointer, and the oil level under static state should be between the two scale marks. Some oil level indicators have only one scale line, so it is better that the oil level is above the scale line.
3. Turn the gear and check whether the rotor operates flexibly. If the motor cannot be started or the rotation is not smooth, disassemble the air inlet pipe of the blower, check whether there is any foreign matter inside the casing, and check whether the rotor clearance is normal. Turn on the power supply to check whether the rotation direction is correct when the turning gear is free from any obstruction.
     

What problems should be paid attention to before starting Roots blower?

2. No load test run
No load test run is to disassemble the exhaust pipe of roots blower (or the inlet pipe of vacuum pump), or open the bypass valve on the pipe, and start the roots blower to run under no load for 20-30 minutes. If an oil pump or cooling water is required, start the oil pump first, open the water circuit, and then start the Roots blower.
During the test run, carefully listen to whether the roots blower has collision sound, and observe the bearing vibration. Pay attention to the sound of the gear and check whether the bearing temperature is normal. Also check whether the electrical instruments are out of order. After parking, check whether the coupling pin nut is loose, or check whether the belt is loose. And compare the clearance of fan rotor before and after the test run, and the clearance between the impeller and the front and rear wall panels for obvious changes.
3. Load test run
On the basis of no-load test, the loaded test run is to gradually turn down the gate valve on the exhaust pipe (or vacuum pump inlet pipe) of Roots blower, so as to gradually increase the exhaust pressure (or vacuum degree). Under the specified load, the operation condition of roots blower shall be tested and inspected.
During the test run, the load shall be gradually increased in stages. The pressure regulating interval is generally 9.8kPa, and the time interval of each pressure regulating is 15-20 minutes, so as to stabilize the working condition and carry out relevant inspections. After reaching the rated pressure, let Roots blower run continuously for about 2 hours.
During commissioning, listen to the sound of rotor running; Check the bearing temperature and vibration; Pay attention to the case surface heating; Check the reading of ammeter; Pay attention to the sealing conditions of water, oil and gas. After shutdown, measure the temperature of lubricating oil; Check whether there are friction marks on working surfaces of impeller, casing and wallboard. After the parts have cooled down, check the rotor clearance to see if there is any change.
4. Linkage commissioning
Linkage test run is to put roots blower into the predetermined working system after the load test run is successful, and run it in linkage with other relevant equipment. Pay attention to check whether roots blower can meet the system needs and whether the capacity of each equipment in the system is balanced.