Abstract
Waste water is an aggressive environment for transport pumps to treatment plants. The pumps used are generally, immersion pumps and are made of various elements like, rotor, stator, housing, screws, flanges, springs, seals, etc. The construction elements of the pumps are made of various metallic materials, such as nodular cast iron, gray cast iron, low alloy steel, stainless steel, aluminum, bronze, brass, copper, etc. When immersed in waste water, the metals form galvanic series. The paper presents the galvanic corrosion analysis of the above-mentioned metals in case the corrosive environment is waste water with various compositions.
Highlights
Waste water is an aggressive environment for transport pumps to treatment plants
Pumping stations are often required for pumping of untreated domestic wastewater, storm water, combined domestic wastewater and storm water, sludge at a wastewater treatment plant, and treated domestic wastewater
For domestic wastewater pumping using radial-flow centrifugals and axial-flow and mixed-flow centrifugal type pumps similar material is used except that they are often made from cast iron, ductile cast iron or stainless steel impellers
Summary
Waste water is an aggressive environment for transport pumps to treatment plants. The pumps used are generally, immersion pumps and are made of various elements like, rotor, stator, housing, screws, flanges, springs, seals, etc. For domestic wastewater pumping using radial-flow centrifugals and axial-flow and mixed-flow centrifugal type pumps similar material is used except that they are often made from cast iron, ductile cast iron or stainless steel impellers. Carbon steel and ductile cast iron both corrode slowly in aerated wastewaters.
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