Different factors will guide your selection of an industrial pump. Pump type, maintenance costs, and size are only some of them. What’s equally important in the selection of your pump is its material. A pump’s material influences its temperature range, chemical and abrasion resistance, and durability.
There are many materials used by industrial pump manufacturers today. The key is matching your pump’s casing and impeller material to the desired factors of your operation. Here’s a guide to help you in making the right material choice:
This is the common material used for pump casing since it’s cheap. It offers optimal performance for pumps in the mining, farming, and industrial sector. Cast iron pumps have a good corrosion resistance to alkaline and neutral pH fluids. This makes them ideal for use in high-temperature processes of not more than 343 degrees Celsius. The corrosion resistance of cast iron is, however, reduced in works that involve acidic fluids.
This material has a higher corrosion, cavitation, and erosion resistance compared to cast iron. Bronze pumps have high compression strength, are capable of running dry, and can be lubricated with grease, process fluids, or water. Bronze is the choice material for pumps used in seawater, offshore oil and gas drilling, and power generation.
High-grades of stainless steel are used in pumps for various applications—more so in oil and gas exploration and water treatment. Though expensive, stainless steel pumps are highly resistant to stress cracking and intergranular and crevice corrosion. This can be used in processes that use organic, chloride, or phosphoric acids.
Regardless of the material you choose for your application, service conditions and your operation’s fluid velocity play a significant role in the pump’s durability. Ensure that you don’t leave fluids sitting idle in the pump for prolonged periods. Stagnant fluids increase the corrosion rate in all the above pump materials, as well.