The Correct Operating Procedure for Explosion-Proof Roots Blowers
Release date:
2021-06-18
Thoroughly inspect all components of the explosion-proof Roots blower to ensure that each part is intact, check the tightness of all bolts and nuts, verify the installation quality of fasteners and locating pins, and confirm the installation quality of inlet and outlet ducts as well as valves. To guarantee the safe operation of the explosion-proof Roots blower, it is strictly prohibited to impose any additional loads on the blower from external sources such as pipelines, valves, or frames.
1. Conduct a comprehensive inspection of all components of the explosion-proof Roots blower, checking whether each part is intact, the tightness of connections for all bolts and nuts, the installation quality of fasteners and locating pins, as well as the installation quality of inlet and outlet ducts and valves.
2. To ensure the safe operation of the explosion-proof Roots blower, it is not permitted to impose additional loads on it from pipelines, valves, frames, or other external components.
3. Check the alignment and centering quality of the explosion-proof Roots blower and the motor.
4. Check whether the base of the unit is fully supported all around and whether the anchor bolts are securely tightened.
5. Pour the specified grade of mechanical oil into the fuel tank up to the oil level mark. The lubricant grade is medium-load gear oil N220.
6. Check whether the rotation direction of the explosion-proof Roots blower motor meets the specified requirements.
7. A belt guard (protective cover) should be installed at the pulley (coupling) to ensure safe operation.
8. Fully open the inlet and outlet valves of the explosion-proof Roots blower. Manually rotate the blower rotor; it should turn smoothly without any impact or friction. Only after confirming that everything is normal can you start the blower for a trial run.
9. No-load trial run of the explosion-proof Roots blower
⑴ Fans that are newly installed or have undergone major overhauls should all undergo no-load trial operation.
⑵ The concept of no-load operation for an explosion-proof Roots blower is: starting the operation with the inlet and outlet valves fully open.
(3) There shall be no abnormal odors, smoking, or sounds of impact or friction. The radial vibration velocity at the bearing location shall not exceed 6.3 mm/s.
⑷ Run under no-load conditions for about 30 minutes. If everything appears normal, you may proceed to load operation. However, if any abnormal operation is detected, after inspection and troubleshooting, you must still perform a no-load trial run.
10. The explosion-proof Roots blower operates normally under load and continues running continuously.
⑴ The adjustment should be gradual and slow, with load being gradually increased up to the rated load. It is not permitted to adjust directly to the rated load in one step.
⑵ The so-called rated load refers to the static pressure difference between the inlet and outlet, based on the rated pressure value indicated on the nameplate. Under normal outlet pressure conditions, it is essential to pay attention to changes in the inlet pressure to avoid overloading.
⑶ During normal operation of the explosion-proof Roots blower, it is strictly prohibited to completely close the inlet and outlet valves. Regularly monitor the pressure conditions and ensure that the safety valve activates and vents air when the load exceeds the rated capacity. If the safety valve fails to act under such conditions, adjust it promptly. Overloading is not permitted.
⑷ Due to the characteristics of explosion-proof Roots blowers, it is not permitted to allow gas from the exhaust port to flow directly back into the blower’s intake port for an extended period (as this would alter the intake temperature). Otherwise, the safety of the machine will inevitably be compromised. If backflow regulation is necessary, cooling measures must be implemented.
⑸ Regularly monitor the oil level of the lubricating oil, conduct periodic inspections, and keep detailed records to ensure proper oil levels. Automatic lubrication systems can be used for equipment maintenance of Roots blowers, as shown in the figure below:
11. The explosion-proof Roots blower should not be stopped abruptly under full load; instead, the load must be gradually reduced before stopping the machine to avoid damage. Users may formulate specific guidelines for emergency shutdown procedures separately.
12. The safe operation and service life of explosion-proof Roots blowers depend on proper and regular maintenance and upkeep. Attention should also be paid to any potential signs of trouble. In addition to following general maintenance procedures, special attention should be given to the following points.
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