(Bonve Pump Industry Cam Rotary Lobe Pump)

Once the core parameters are complete, the first decision you face is: What type of pump should be chosen? Although centrifugal pumps are widely used due to their simple structure, uniform flow, and easy regulation, they are not suitable for all scenarios. The essence of selection lies in identifying those "weakness conditions" for pumps.

When the kinematic viscosity of the conveyed medium exceeds 300 mm²/s, the efficiency of a centrifugal pump drops sharply; at this point, positive displacement pumps like rotary lobe pumps are often a more efficient choice. For applications requiring constant flow, high pressure, and precise metering or dosing, such as chemical additive injection, metering pumps (reciprocating or diaphragm type) have irreplaceable advantages. If the gas content in the medium exceeds 5%, it can easily cause centrifugal pump cavitation and performance interruption; vortex pumps or self-priming centrifugal pumps can better handle gas-liquid mixtures. For extremely corrosive media, magnetic drive pumps or canned motor pumps may be required to achieve complete leak-free operation and ensure safety.

After determining the general category, it is necessary to further determine the pump series and materials. For example, after selecting a rotary lobe pump, different series correspond to different media: corrosion-resistant chemical process pumps for corrosive liquids, or solids-handling pumps for liquids containing impurities. Material selection is crucial: cast iron can be used for conveyingroom-temperature clean water; stainless steel 304 or 316 is needed for dilute sulfuric acid; nickel-based alloys may be required for concentrated alkaline solutions. For highly toxic, expensive, or explosive media, leak-free pump types (magnetic pumps, canned motor pumps) or pumps equipped with double mechanical seals and leakage monitoring are mandatory requirements.

Next is determining the specific model (specification). For centrifugal pumps, plot the process-required rated flow and head (usually taking 1.1 times the maximum flow and 1.05 times the calculated head) onto the pump manufacturer's series selection chart. Models whose operating points fall within the high-efficiency zone are preliminary selection targets. Cavitation check is then mandatory: ensure NPSHa > NPSHr + safety margin (usually 0.5-1 meter). If not satisfied, the installation height must be lowered or a pump with a lower NPSHr should be selected. For positive displacement pumps like reciprocating pumps, the selection criteria are: process-required maximum flow ≤ pump rated flow, and the maximum possible pressure at the pump outlet ≤ pump rated allowable pressure.

Finally, select the manufacturing standard based on the importance of the installation. For high-demand applications, follow standards like API 610 (centrifugal pumps), API 674 (reciprocating pumps), or API 676 (rotary pumps); for general applications, ISO 5199 (GB 5656) or ASME standards can be adopted. The choice of standard affects the pump's design, materials, testing, and quality assurance levels.

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.