If a rotor pump experiences severe outlet pressure fluctuations during operation, this often stems from the interaction between its positive displacement characteristics and pipeline resistance. Effective countermeasures include installing a gas-charged pulsation dampener of appropriate volume near the outlet and optimizing pipeline design—reducing elbows, reasonably increasing pipe diameter, and controlling flow velocity. For high-viscosity fluids, maintaining stable trace heating or insulation is crucial to minimize resistance fluctuations caused by viscosity changes.

Cavitation can be identified by several typical signs: a siren-like noise from the pump, increased vibration levels, abnormal fluctuations in outlet pressure and flow, and honeycomb-shaped erosion marks on the impeller. The core of mitigation lies in improving inlet conditions: lowering the pump installation height, cleaning inlet filters and pipelines, and considering adding an inlet cooler for high-temperature media to increase the available Net Positive Suction Head (NPSHa).

When metering accuracy deviates, on-site calibration using the volumetric method should be performed. The steps are: directing the medium into a calibration tank of known volume, running the pump at a set flow rate for a sufficient duration, and calculating the deviation between the actual and theoretical delivered volume. If the deviation exceeds the allowable range, adjustments to the pump's stroke mechanism or speed are necessary, followed by repeated testing until accuracy meets process requirements.

Regarding type selection, the main advantages of double-suction centrifugal pumps lie in high-flow capacity and superior cavitation resistance. Special attention must be paid to medium viscosity during selection; a correction factor should be applied for high viscosity, and inlet/outlet pipelines must be installed symmetrically to avoid generating unbalanced radial forces.

The choice of sealing form is highly dependent on the actual operating conditions. For applications involving high temperature, high pressure, or where leakage is strictly prohibited, mechanical seals are generally the more reliable option, especially those utilizing high-temperature resistant materials like silicon carbide rotating rings and metal bellows structures. Under normal temperature and pressure conditions, packing seals remain suitable due to their cost-effectiveness and easier maintenance.

If the equipment is planned for extended shutdowns, standardized preservation is vital, focusing on comprehensive rust and moisture prevention. This involves thoroughly draining and flushing the pump of medium, replenishing grease in the bearing housing, injecting anti-rust oil into the mechanical seal chamber, applying protective paint to the pump exterior, and periodically manually rotating the rotor to prevent component seizure or deformation.

When abnormal vibration levels occur during operation, spectrum analysis can help preliminarily diagnose the fault: dominance of the 1x rotational frequency often indicates misalignment or bearing issues; prominence of the 2x frequency may suggest loose foundation bolts; and high-frequency components are commonly related to impeller imbalance. Targeted correction based on the analysis can effectively reduce vibrations in most cases.

Bonve always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

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