fuyangby@126.com
86 15188770013
fuyangby@126.com
86 15188770013
The decrease in efficiency of slurry pumps is mainly caused by mechanical wear, medium problems, improper operation, and design defects. It is necessary to improve efficiency through targeted maintenance, medium optimization, and structural improvement.
Fault cause analysis
The core reasons for the decrease in efficiency of slurry pumps can be divided into four categories, as follows:
Mechanical wear: bearing wear, excessive abrasion of impeller/sealing ring, increased vibration due to shaft seal failure, severe leakage, decreased flow and head
Media issues: Imported mud contains coarse particles, high concentration, impurities blocking the flow channel, pump body blockage, impeller flow, current fluctuations
Improper operation: motor reversal, insufficient lubrication, inlet and outlet valves not fully open, cavitation phenomenon not discharging, bearing overheating, abnormal noise
Design defects: unbalanced impeller stress, unreasonable flow channel design, insufficient material wear resistance, unstable operation, severe local erosion, short service life of flow components
Improvement measures and implementation
To address the above reasons, we can start from three aspects: maintenance, medium control, and structural optimization:
Daily maintenance and operation standards
Regular inspection: Monitor the bearing temperature (≤ 75 ℃) and vibration value (≤ 4.5mm/s) weekly, and replace the lubricating oil (lithium grease No.2) monthly.
Avoid cavitation: Ensure that the inlet liquid level is above the minimum allowable value, exhaust and fill the medium before starting.
Standard operation: When starting up, first turn on the shaft seal water and then start the pump. Rinse for 2-5 minutes before stopping, and it is strictly prohibited to idle for more than 30 seconds.
Medium and process optimization
Pre treatment: Use screening or precipitation to remove coarse particles with a diameter greater than 5mm, and control the slurry concentration to be ≤ 40%.
Pipeline design: Reduce 90 ° elbows (with an additional loss head of 0.5m), and increase the inlet pipe diameter by 1-2 levels compared to the pump inlet.
Structural improvement and material upgrade
Optimization of overcurrent components: The impeller is made of high chromium cast iron (Cr27) or rubber material, and the clearance between the volute tongue is increased to 22mm and rounded to R20mm.
Sealing upgrade: Replace the packing seal with a mechanical seal, which can reduce the leakage rate to below 0.1L/h and extend the service life to 2-3 years.
Effect verification and long-term management
Efficiency recovery goal: Through the above measures, pump efficiency can be improved by 15-20%, and the lifespan of overcurrent components can be extended to 3-6 months (originally 1-2 months).
Establish a ledger: record the type of fault, handling measures, and consumables replacement cycle for each occurrence, and form a preventive maintenance plan.
This article originates from https://www.fuyangpumps.com/news/494.html. Please indicate the source when reprinting.
(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
Copyright © Hebei Fuyang Pump Industry Co., Ltd.
