Differences between petrochemical centrifugal pumps and single-stage centrifugal water pumps
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According to the standard GB/T13007-2011, centrifugal pumps are classified into single-stage centrifugal pumps and petrochemical centrifugal pumps in terms of efficiency. I would like to know what the differences between these two types of pumps are Also, may I ask to which category of pumps do fluoroplastic-lined pumps belong?
Many of the fluids transported by chemical pumps have viscosities that vary significantly from that of water; therefore, the specified efficiency values for chemical pumps are relatively conservative, and their efficiency is lower than that of pumps used for transporting water
What are the structural differences between the two pumps?
Fluorinated lining pumps differ from metal pumps only in terms of their material; they are generally used for transporting highly corrosive fluids. Their resistance to temperature changes and strength are slightly lower, and they belong to the category of chemical pumps. They are cheaper than metal pumps, but are not typically used for transporting clean water.
Designed with cost reduction in mind, clean water pumps have a relatively simple structure, with limited strength and reliability; their shaft sealing requirements are low, and they are generally characterized by high flow rates and low head pressures. Chemical pumps are designed to be reliable; they are required to operate continuously for a certain number of hours without failing (excluding wear-prone components). In addition, there are various regulations set by different companies, industries, and standards, which leads to the inclusion of many features that facilitate maintenance and enhance reliability. These pumps have high strength and a high degree of reliability. Generally, chemical pumps have low flow rates but high head pressures. Moreover, they must be resistant to corrosion, pressure, temperature, and particles, which requires the use of specialized designs. High requirements are also placed on preventing leakage at the shaft seals
Chemical process pumps sacrifice efficiency to ensure equipment stability
Chemical pumps – different materials and models are selected based on the properties of the medium to be transported, such as acidity or alkalinity, temperature, solid content, etc. The fluoroplastic-lined pumps you mentioned also fall under the category of chemical pumps; they can handle acidic and alkaline media. However, we generally refer to them as fluorine-lined pumps. The outer layer is made of cast iron to enhance strength. Water pumps, on the other hand, have a relatively simpler structure and lower costs