Screw Pump Usage Guidelines
The screw pump is a liquid transfer device widely used in the industrial field, and its stability and safety are crucial to the overall operation of the system. Mastering the usage guidelines for screw pumps, especially during the startup, operation, and shutdown processes, requires a solid theoretical foundation and practical experience. This article provides an in-depth exploration of the key technical points in the startup, operation, and shutdown of screw pumps to ensure optimal operation and extend the equipment’s service life.
Screw Pump Startup Procedure
The startup process of a screw pump requires particular caution. First, before starting, it is essential to ensure that the suction and discharge valves are fully open to prevent overload or cavitation, which could cause irreversible damage to the equipment.
Although screw pumps have certain dry suction capabilities, prolonged dry running is strictly prohibited to avoid severe wear on the working surfaces inside the pump. When starting the pump under conditions of low oil temperature or high viscosity, the suction and bypass valves must be fully open to minimize the mechanical load during startup. Once the prime mover reaches the rated speed, the bypass valve should be gradually closed.
During the bypass valve’s open phase, the liquid circulates within the pump, but extended circulation can cause excessive liquid temperature, leading to pump deformation or damage. Therefore, it is crucial to strictly monitor the circulation time and liquid temperature to prevent overheating and equipment failure.
Considerations for Screw Pump Operation
During operation, the screw pump should operate in the specified direction to ensure the normal suction and discharge of the liquid. It is essential to monitor key operating parameters, including pressure, temperature, and the status of the mechanical shaft seal.
A small amount of leakage is considered normal for mechanical shaft seals, typically one drop every 20 to 30 seconds is acceptable. However, a significant increase in leakage may indicate shaft seal wear or installation issues, requiring prompt inspection and maintenance.
Additionally, abnormal noise during operation is usually caused by low oil temperature leading to high viscosity, air entering the oil, misalignment of the coupling, or excessive wear of the pump components. Appropriate troubleshooting and remedial measures should be taken to prevent further damage to the equipment.
Screw Pump Shutdown Protocol
The shutdown procedure for screw pumps must also follow strict protocols. When shutting down, the discharge valve should be closed first, and once the pump has completely stopped, the suction valve should then be closed.
Due to the considerable length of the screw inside the pump and its relatively low rigidity, there is a risk of bending, which may affect normal operation. Therefore, it is vital to ensure accurate alignment of the shaft connection, and alignment should be performed after the equipment has been positioned to avoid deformation due to pipeline stress.
When connecting pipelines, they should be independently supported to minimize stress on the pump body. Additionally, for backup screw pumps, it is recommended to store them in a suspended position to prevent deformation due to uneven placement.
Working Principle of Screw Pumps
The working principle of screw pumps can be traced back to the third century BC, when Archimedes invented the screw rod to continuously and smoothly lift liquid to a height of several meters. This principle remains the theoretical foundation for modern screw pump design.
A thorough understanding of the screw pump’s operating principles and adherence to scientific usage guidelines can effectively extend the equipment’s service life, ensuring long-term efficient operation and maximizing economic benefits in industrial production.
Screw pumps play an essential role in industrial production, and their proper use directly impacts production line efficiency and equipment longevity. Mastering the standard operating procedures for startup, operation, and shutdown, along with real-time monitoring of equipment parameters, is crucial for ensuring the efficient and stable operation of screw pumps.
Through scientific management and maintenance, production efficiency can be maximized, equipment failure rates reduced, and production costs saved.
By understanding the above usage guidelines for screw pumps, you can better comprehend and master the operational skills required for their efficient use. For further information on the use and maintenance of screw pumps, please refer to additional literature or consult professional technical personnel.