Materials
Duplex Stainless Steel Pumps
Corrosion simulation
Corrosion Protection
Seawater is used at many facilities, including desalination plants and power plants that use large amounts of cooling water. However, stainless steel and other materials corrode in seawater. Ebara has extensive knowledge and experience in dealing with the causes of corrosion, e.g., sea-area-dependant salt concentrations and temperatures, material types, difference of potential between materials,water flow, and velocity differences. Thus, we can ensure the stable pumping of seawater through the proper selection of materials, cathodic corrosion protection, BEM-based corrosion prediction analysis, the development of duplex stainless steel fabricated pumps, etc.
Duplex Stainless Steel Pumps
While duplex stainless steel was not previously used for pumps because of the difficulty in welding, Ebara has overcome this challenge by using a proprietary welding technique and developing large fabricated seawater pumps made of duplex stainless steel that are highly resistant to seawater corrosion. These pumps are currently in operation at various facilities using large amounts of seawater.
Sand Erosion Protection
Repetitive collisions between sand from the water with the surface of the impeller and other pump internal components causes erosion during pumping. In addition to the use of hard materials, Ebara ensures stable pump operation through erosion rate prediction and erosion protection, such as the spraying of coating containing ceramic.