What Is a Stainless Steel Vertical Multistage Pump? A stainless steel vertical multistage pump is a type of centrifugal pump featuring multiple impellers mounted on a vertical shaft. Each impeller increases the fluid pressure, allowing the pump to generate high head even at relatively low flow rates.Constructed primarily from stainless steel, these pumps offer excellent corrosion resistance, making them suitable for demanding environments where water quality or chemical exposure can affect pump performance. The vertical configuration provides several advantages: it saves floor space, simplifies maintenance, and allows for direct coupling with motors. Stainless steel components, including impellers, shaft, and casing, contribute to extended service life, particularly in systems where water contains dissolved oxygen or is otherwise aggressive.