Many people assume that pump operation is nothing more than simple start-stop operations,yet they overlook the complex system support behind it.In fact,the stable operation of pumps forms a complete closed loop from selection to system design.Any oversight in a single link may lead to failures such as vibration,cavitation and dry running,which will in turn disrupt the entire production schedule.

-Bonve Pumps Cam Type Twin Rotor Pump-

I.Scientific Pump Selection

Pump selection must comprehensively consider process parameters and medium characteristics,and cannot be determined solely by a single indicator.

-Medium characteristics are the primary basis for pump selection:Physical properties include operating temperature,density,viscosity,as well as solid particle size and gas content.These parameters directly affect system head calculation and effective net positive suction head(NPSH)evaluation.Chemical properties such as corrosivity and toxicity are important bases for selecting pump body materials and shaft seal types.For high-viscosity or particle-containing media,rotor pumps often have better adaptability than centrifugal pumps.

-Flow parameters determine production capacity:The design stage usually provides three flow values:normal,minimum and maximum.Selection should be based on the maximum flow rate while taking normal operating conditions into account.If the maximum flow rate is not specified,1.1 times the normal flow rate can be used as the reference.

-Head must reserve a reasonable margin:The head required by the device needs to be amplified by 5%-10%to cope with pipeline resistance fluctuations.Single-stage centrifugal pumps are preferred for low-head conditions,while multi-stage centrifugal pumps or positive displacement pumps can be considered for high-head conditions.

II.Anti-Cavitation Measures

Cavitation will cause impeller corrosion,pump body vibration and sharp drop in efficiency,and is the main cause of premature pump failure.After the pump is selected,the following measures can be taken to avoid cavitation:

-Optimize installation height:Within the economically feasible range,lower the pump installation position as much as possible.For suction installation,reduce the suction height;for flooded installation,increase the flooding head to increase inlet static pressure.

-Optimize suction pipelines to reduce pressure drop:Reduce the number of fittings such as elbows and valves in the suction pipeline,and appropriately increase the pipe diameter.Return pipelines for long-term continuous operation should be connected to the suction vessel instead of directly to the pump inlet to avoid interfering with the inlet flow field.

-Adjust operating speed:On the premise of meeting process requirements,appropriately reducing the pump operating speed can effectively reduce the required NPSH of the pump and improve suction performance.

-Selecting pump types with better suction performance or optimizing the impeller inlet of existing pumps can also reduce the probability of cavitation.

III.Anti-Dry Running Measures

Dry running will lead to seal burnout and shaft deformation and other serious accidents.The design of the suction-side system should revolve around the smooth flow of liquid:

-The layout of suction vessels and pipelines should ensure uniform liquid suction for all parallel pumps.The distance between independent suction pipes should be greater than 2.5-3 times the maximum diameter of the foot valve.

-Installing a vortex breaker at the bottom of the vessel can effectively prevent vortex formation and avoid air being drawn into the pump.

-The liquid inlet pipe,return pipe and waste liquid pipe of the vessel should be away from the suction port.If necessary,partitions can be installed in the vessel to extend the bubble rise time.

-The suction port should maintain a submerged depth of 1.5-2 times the pipe diameter,and the height from the vessel bottom should be 0.7-1.0 times the pipe diameter to prevent suction of sediment.

There is no one-size-fits-all solution for the stable operation of pump systems.Only by controlling from the source of selection,eliminating hidden dangers in installation and pipeline design,and doing a good job of protection at the suction end can we fundamentally solve the problems of unstable operation,cavitation and dry running,and ensure continuous and safe production.

Bonve pump 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.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.