Thread Content
Pump selection principles: When designing equipment and systems, the design institute must determine the purpose and performance parameters of the pump and select the appropriate type of pump. This choice begins with selecting the type and design of the pump. So, what principles should be used to choose a pump? What is the basis then? 1. Ensure that the type and performance of the selected pump meet the requirements of process parameters such as flow rate, head, pressure, temperature, net positive suction head, and suction lift. 2. The pump must also meet the requirements related to the properties of the medium being transported. For pumps used to transport flammable, explosive, toxic, or valuable substances, it is necessary to have a reliable shaft seal or to use a leak-free pump, such as a magnetically driven pump (which has no shaft seal and relies on indirect magnetic drive). For pumps handling corrosive media, the moving parts should be made of corrosion-resistant materials, such as those used in fluoroplastic corrosion-resistant pumps. For pumps transporting media containing solid particles, the moving parts need to be made of wear-resistant materials; where necessary, the shaft seal should be flushed with a clean liquid. 3. Mechanically, high reliability, low noise, and minimal vibration are required. 4. Calculate the investment cost associated with pump procurement correctly; for details, see: How to Correctly Calculate the Investment Cost of Purchasing Pumps. Basic selection guidelines: When designing equipment and systems, the design team must determine the purpose and performance parameters of the pump and select the appropriate type of pump. This choice begins with selecting the type and design of the pump. So, what principles should be used to choose a pump? What is the basis then? I. Principles for Pump Selection 1. The type and performance of the pump selected must meet the requirements of process parameters such as flow rate, head, pressure, temperature, net positive suction head, and suction lift of the installation. 2. The requirements related to the properties of the medium must also be satisfied. For pumps used to transport flammable, explosive, toxic, or valuable materials, it is necessary to have reliable shaft seals or to use leak-free pumps, such as magnetically driven pumps (which have no shaft seals and rely on indirect magnetic drive). For pumps used to transport corrosive media, the moving parts should be made of corrosion-resistant materials, such as those used in fluoroplastic corrosion-resistant pumps. For pumps handling media containing solid particles, the moving parts need to be made of wear-resistant materials; where necessary, the shaft seals should be flushed with a clean liquid. 3. Mechanically, high reliability, low noise, and minimal vibration are required. 4. Calculate the investment cost for purchasing pumps correctly; for details, see: How to Correctly Calculate the Investment Cost of Purchasing Pumps. II. Below are the basic guidelines for pump selection: 5. When transporting highly corrosive substances (such as concentrated sulfuric acid or concentrated nitric acid), flammable and explosive substances, or in environments where there must be no contamination at all, magnetic pumps can be used, such as the CQB series of magnetic pumps and the IMD series of magnetic pumps. If self-priming is required, the FZB fluoroplastic self-priming pump can be chosen. 6. IHF centrifugal pumps and FSB centrifugal pumps feature high speed, small size, light weight, high efficiency, large flow rate, simple structure, smooth fluid delivery, stable performance, ease of operation, and convenience in maintenance. When there are no special requirements regarding operating conditions, centrifugal pumps are a good choice. 7. For pumps used to transport chemical media containing solid particles, where wear-resistant materials are required for the convective components, UHB mortar pumps are the best choice. The material used in UHB corrosion- and wear-resistant mortar pumps is a high-strength novel engineering plastic called UHBWPE, which is a modified polyethylene with an ultra-high molecular weight of over 5 million. In plastics, it exhibits excellent wear resistance; experimental comparisons show that its wear resistance is far higher than that of stainless steel. It also boasts impact resistance, creep resistance, and outstanding corrosion resistance (comparable to F4), as well as unique properties such as non-adhesion. 8. When the liquid level of the medium is below the pump’s installation location: an FZB fluoroplastic self-priming pump should be used. If the properties of a magnetic pump are also required, then a ZMD fluoroplastic self-priming magnetic pump can be chosen. III. Selecting the most suitable model based on the pump’s performance curve: When no suitable model is found in the performance parameters table due to specific usage requirements, the pump’s performance curve can be referred to in order to select the most appropriate type of pump.