How about the cast iron impeller of pipeline pump? What are the characteristics and application advantages?

In industrial fluid delivery systems, pipeline pumps are a common equipment, which are widely used in water supply, heating, air conditioning systems and chemical industries. Cast iron impellers, as one of the important components of pipeline pumps, play a key role in the performance, durability and cost of pumps.
Pipeline pumps are a type of centrifugal pump with compact structure and convenient installation. They are usually directly connected to the pipeline system and used to transport various liquids. The impeller is the core component of the pipeline pump, which determines the flow, head and operating efficiency of the pump. Cast iron impellers have become one of the most common impeller materials in pipeline pumps due to their excellent wear resistance, cost-effectiveness and wide applicability.
Cast iron impellers are mainly made of gray cast iron (HT200, HT250) or ductile iron (QT400-18, QT500-7). These materials have good strength, wear resistance and corrosion resistance, and are suitable for conveying clear water, mildly corrosive liquids and media with tiny particles.
Cast iron has high hardness and impact resistance, which enables the impeller to maintain a stable shape during long-term operation and is not easily affected by wear and tear.
Gray cast iron and ductile iron have certain corrosion resistance to weak acid and weak alkali environments, and can meet the needs of general industrial and civil water supply systems.
Compared with stainless steel, bronze or engineering plastic impellers, cast iron impellers have lower production costs and are suitable for most economical pipeline pumps.
Cast iron impellers are suitable for various water supply systems, HVAC, fire protection systems and industrial fluid transportation, meeting the transportation needs of most common fluids.
Advantages and limitations of cast iron impellers
Advantages:
High strength: cast iron impellers can still maintain good mechanical strength under high pressure and large flow conditions and are not easy to deform.
Good temperature resistance: suitable for conveying liquids at higher temperatures (usually up to 80°C~120°C).
Mature production process: cast iron manufacturing technology is mature, suitable for mass production, and ensures stable product quality.
Limitations:

Limited corrosion resistance: Although cast iron can withstand mild corrosion, it is prone to rust in strong acid, strong alkali, high salinity or seawater media, and is not suitable for conveying highly corrosive liquids.
Relatively heavy: Cast iron has a higher density and is heavier than aluminum alloy or engineering plastic impellers, which limits its application in some lightweight equipment.
Susceptible to impact cracking: Compared with ductile iron or stainless steel, cast iron has weaker impact resistance and may crack due to mechanical shock or long-term vibration.
Cast iron impellers are often used in urban water supply pumping stations because of their high strength and durability, which are suitable for conveying clean water or water sources with slight impurities. Used in cooling water circulation systems, the temperature resistance and stability of cast iron impellers ensure the long-term reliable operation of the water pump. In industrial fields such as chemical, metallurgical, and power plants, cast iron impeller pipeline pumps can be used for circulating water, cooling water, and some industrial wastewater transportation.
Since fire pumps require stable high flow and high head, cast iron impellers have become a common impeller material for fire pumps due to their good mechanical strength and cost advantages.
As an important component of pipeline pumps, cast iron impellers have been widely used in water supply, HVAC, fire protection, industry and other fields due to their high strength, good wear resistance and low cost. Although cast iron impellers have certain limitations in corrosion resistance and weight, they are still one of the best choices for general clean water transportation and mildly corrosive environments. When purchasing pipeline pumps, users should choose appropriate impeller materials according to the conveying medium, operating environment and usage requirements to ensure efficient and stable operation of the pump.