Corrosion-resistant multi-stage centrifugal pumps are common equipment in salt chemical engineering and brine extraction operations, specially used for transporting corrosive brine. Working conditions for such pumps are harsh. Improper operation may easily cause blockage, leakage and component wear, shortening service life of the equipment. By focusing on three key stages: start-up, operation and shutdown during daily use, failures can be greatly reduced to ensure safe production.
Pre-start inspection is indispensable and serves as the foundation for fault prevention. First, check whether the pump casing, flanges and anchor bolts are loose, verify that inlet and outlet pipelines are unobstructed, and confirm filters are free of debris blockage. Next, manually turn the rotor to ensure it rotates flexibly without jamming or abnormal noise. Meanwhile, confirm proper motor earthing and correct rotation direction. Prime the pump and vent air in advance. Dry start is strictly prohibited, as dry running can quickly burn out mechanical seals and impellers. In addition, ensure the brine liquid level meets requirements and the sand content stays at a low level to mitigate component wear.
During equipment operation, focus on monitoring and standardized operation. After start-up, let the equipment run smoothly before slowly opening the outlet valve. Never open it fully all at once, which may lead to current overload and severe equipment vibration. Keep observing current, noise, vibration and pump tightness during operation. Shut down the pump immediately for inspection once abnormal phenomena such as strange noise, leakage or sudden flow drop occur. Sealing cooling water must remain uninterrupted during operation to avoid dry running. Do not restart the pump right after short-time dry running, to prevent component damage caused by thermal expansion and contraction.
Post-shutdown maintenance is critical to extend equipment service life. For short-term shutdown, clean brine crystals and residual impurities inside the pump and pipelines to prevent crystal blockage of flow passages. For long-term shutdown, drain all liquid inside the pump completely to avoid pump casing corrosion and component cracking caused by brine. Conduct regular maintenance: inspect and replace aged seals and lubricating oil every 3 to 6 months, and clean filters periodically to reduce failures fundamentally.
In summary, the core operation principles are: thorough inspection before start-up, stable operation during running, and diligent maintenance after shutdown. Strictly follow operating specifications to guarantee stable equipment operation and cut operation & maintenance costs.