Updated and republished, the ANSI/HI 2.3-2013 standard has returned for the first time since 2008. The purpose of this standard is to create a guide for the design and application of rotodynamic verical pumps for various services, as well as the features and necessary precautions needed to be taken when using this type of pump. Types of rotodynamic vertical pumps covered in this standard are: Vertical Turbine Mixed Flow Axial Flow Vertical Diffuser Submersible Motor Deepwell Short-Set Pumps, types VS0, VS1, VS2, VS3, VS6, VS7 and VS8 These pumps are driven by vertical electric motors or horizontal engines with right-angle gears. Excluded from the scope of this document are vertical in-line volute pumps and centrifugal volute pumps mounted vertically, such as sewage pumps.