Scope of Standard: ANSI/HI 12.1-12.6 offers a basic educational overview on rotodynamic (centrifugal) slurry pumps, design and application considerations related to the selection of the right pump for a specific industry including pump installation as well as operation and maintenance procedures. The standard addresses a variety of pump designs in the categories of: Overhung impeller/close coupled pumps Overhung impeller/flexibly coupled pumps New to the Standard: Explained non-Newtonian slurry conditions Experimental froth volume factor Application limits of single mechanical seals Fully split pusher seal information now included Mechanical seal materials Added definitions: specific energy consumption, Operating precautions for threaded impellers Revised start-up instructions/ recommendations