In industrial production processes,the delivery of corrosive media is often accompanied by common problems including leakage,abrasion and short equipment service life.Traditional pump types can hardly meet the multiple demands of corrosion resistance,self-priming and high-viscosity delivery at the same time.Corrosion-resistant metal rotor pumps provide a reliable technical solution for such complex working conditions.

-Bonve Pumps Cam-Type Twin Rotor Pump-

Core Performance and Scenario Advantages

This type of positive displacement pump has remarkable technical advantages over centrifugal pumps and non-metallic pumps in corrosive working conditions.First,it boasts outstanding self-priming performance and media adaptability:no additional priming tank is required,with a self-priming height of up to 6 meters and a horizontal conveying distance of over 100 meters;it is compatible with high-viscosity fluids up to 2,500,000 cp,far exceeding the applicable range of centrifugal pumps;meanwhile,it has superior media passability,allowing solid particles with a maximum diameter of 70 mm to pass through,and soft debris rarely causes pump blockage.Second,it features low-shear and steady delivery characteristics.The equipment usually operates at a speed range of 200–600 rpm,and when conveying shear-sensitive chemical emulsions and other media,it can preserve the original components of the materials to the greatest extent.In addition,adjusting the rotor rotation direction can reverse the medium flow,which adapts to the reverse conveying requirements of special chemical processes.

Compared with common corrosion-resistant pump types,metal rotor pumps have more comprehensive scenario adaptability.Stainless steel centrifugal pumps have large flow rate and low cost,but lack self-priming capacity and are only applicable to thin,clean low-viscosity corrosive liquids;plastic-lined pumps have good strong-acid corrosion resistance and low price,but their applicable temperature is usually below 100℃,with poor mechanical strength and no resistance to particle abrasion,only suitable for low-temperature,low-pressure and wear-free scenarios.In contrast,metal rotor pumps can cover multiple complex working conditions,and are the optimal solution for scenarios where corrosive media are accompanied by viscosity,impurities or high temperature.

Key Material Points for Equipment Selection

The corrosion resistance and durability of the equipment fundamentally depend on the material selection of key components,which is also the core consideration in the rotor pump selection stage.The pump casing and liner plates are usually integrally cast from 304 or 316L stainless steel,and duplex stainless steel or Hastelloy can be selected for harsh working conditions;the inner wall of the pump chamber is equipped with replaceable protective liner plates.When worn,only the liner plates need to be replaced instead of the entire pump casing,which can effectively reduce long-term operation and maintenance costs.

Rotor materials are divided into rubber-coated and all-metal categories.For purely highly corrosive working conditions,all-metal rotors are preferred.Among them,316L stainless steel rotors have the strongest universality,compatible with dilute sulfuric acid,sulfurous acid,nitric acid,caustic soda as well as most organic acids and salt solutions,making them the most widely used corrosion-resistant material at present.High-performance nickel-based alloys such as Alloy 88 are designed for extreme working conditions,with excellent corrosion resistance and anti-seizure properties,which can avoid"seizure"failures caused by frictional heating during rotor operation.However,this material is not resistant to nitric acid,so the rotor must be removed when conveying nitric acid or performing passivation cleaning.For the sealing system,cartridge mechanical seals are adopted with standard silicon carbide faces,which integrate three core performances:wear resistance,high temperature resistance and corrosion resistance.

Specifications for Daily Maintenance

To ensure long-term stable operation of the equipment,a standardized full-cycle maintenance procedure must be implemented.Daily patrol inspection shall focus on operation stability,and immediate shutdown and troubleshooting are required in case of violent vibration or abnormal noise;at the same time,check whether pipeline connections are loose.Micro-leakage is allowed for mechanical seals,but if the leakage forms a continuous stream,the equipment shall be shut down for treatment in time.

For regular maintenance,three key tasks shall be carried out:First,coupling coaxiality calibration.The coaxial alignment of the motor shaft and pump shaft coupling shall be tested regularly,with the standard that the radial offset is less than 1%of the maximum outer diameter of the coupling,and the deflection angle≤1°30′.Coaxiality deviation will cause eccentric wear of rotors and bearing damage.Second,lubrication management.The lubricating oil in the synchronous gearbox shall be kept clean.It is recommended to replace the lubricating oil once after the first month of operation for a new pump,and then replace it every 500 operating hours or according to the working condition cycle.Third,inspection of wearing parts.Regularly check the wear and aging of liner plates,rotors and mechanical seals,and replace failed components in time.

Proper protection shall be provided during equipment shutdown.When conveying easily crystallizable or highly corrosive media,clean the pump chamber and drain accumulated liquid after pump shutdown to prevent crystallization from damaging the seal or causing pump body freeze-cracking at low temperatures;standby equipment shall be stored in a dry,clean environment free of corrosive gases.During disassembly and inspection,keep all parts properly to avoid bumping and scratching the precision rotor and sealing end faces.

Overall,the core value of corrosion-resistant metal rotor pumps lies in solving the complex working condition problems that traditional corrosion-resistant pumps cannot address,while meeting multiple requirements including corrosion resistance,self-priming,high viscosity and particle tolerance at the same time.Although the initial investment is slightly higher,it features low maintenance costs and less fault downtime throughout the entire life cycle,with outstanding comprehensive operation advantages.

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.