Basic selection guide for chemical process pumps

The basic guidelines for selecting pumps for chemical applications are as follows: 1. Identify the medium to be transported: – Chemical properties (such as corrosivity, flammability, toxicity) – Physical properties (viscosity, density, temperature, particle content). 2. Determine the performance parameters of the pump: – Flow rate (m³/h or L/min) – Head (m) – Operating pressure – Temperature range. 3. Select the type of pump: – Centrifugal pumps: suitable for transporting large volumes of media with low viscosity; they have a simple structure and are reliable. - Diaphragm pump: Suitable for transporting highly viscous, volatile, toxic, and harmful liquids, with a low risk of leakage. - Magnetic pump: Suitable for media with strict leakage requirements, such as highly corrosive, toxic, or flammable and explosive liquids. - Screw pumps, gear pumps: Suitable for transporting high-viscosity media or in applications with special requirements. 4. Material selection: Based on the corrosivity of the medium and temperature, appropriate materials should be chosen, such as stainless steel, plastics (PP, PVDF), fluoroplastics, titanium, or corrosion-resistant alloys. 5. Sealing type: Select a mechanical seal, packing seal, or a sealless design (magnetic pump) based on the properties of the medium. 6. Pump drive method: Select drive methods such as motors, explosion-proof motors, or variable-frequency motors based on actual requirements. 7. Requirements for equipment installation and operating environment: Consider the actual conditions on site, such as explosion protection rating, space constraints, noise requirements, and other factors. 8. Cost-effectiveness and ease of maintenance: Take into account the purchase cost of the pump, operating costs, the difficulty of maintenance, as well as the availability of spare parts. Taking all the above factors into account, selecting the most suitable chemical pump appropriately can ensure safe and reliable operation as well as extend the equipment’s service life. .