Flowserve Corporation has devoted more than 85 years to the development of alloys and the production of equipment to provide long, trouble-free life when handling severe corrosives. Pumps, valves, pipe, fittings, anodes, towers and various accessory castings are among the equipment engineered and produced by Flowserve Corporation in various nickel-base alloys, iron-base alloys, and reactive alloys. The ratings listed in this bulletin represent the concentration and temperature at which each alloy experiences 20 mpy corrosion or less in an uncontaminated environment, unless otherwise indicated. Where applicable, localized forms of corrosion, such as pitting and stress corrosion cracking, have been considered. However, many other factors must be considered when selecting a material for a corrosive service. These include: primary corrosive; secondary corrosive; contaminants; concentration; pH; maximum, minimum and normal operating temperature; viscosity; velocity; solids in suspension; continuous or intermittent operation; degree of aeration; type or design of equipment; and any other peculiarities of the solution. These ratings may be used as a guide in selecting materials for many Flowserve product components, including pipe, casings, covers, impellers, and valve bodies. Critical components such as plugs, shafts, and mag drive containment shells require lower rates of corrosion. In these cases, we recommend consulting with the Flowserve Materials Engineering Department. The corrosion chart in this bulletin is intended to be a guide to the selection of the proper corrosion resistant material for a given application. The ratings are not a blanket recommendation or warranty, expressed or implied, for any of the materials for any media. These ratings are the compilation of extensive laboratory and field tests, operating experience and best judgement.