This guide contains a summary of current industrial practices and is based on the combined knowledge,experience,and practices of major liquid oxygen producers. It is written as a reference document when specifying stationary,electric-motor-driven,centrifugal liquid oxygen pump designs and installations,and is a guide for the operation and maintenance of this equipment. It is not intended to cover other types of pumps such as reciprocating or vehicle mounted. While many parts of this guide can be used as the basis for those other types of pumps,it is not written considering all the special features of those designs. In addition,it does not attempt to include design and installation criteria for all cryogenic pumps but focuses on those specifically related to oxygen safety. Most industrial experience involves pump installations where the liquid oxygen concentration is 95 mol % or greater. The installer shall exercise sound engineering judgment when specifying pumping equipment for oxygen-enriched liquid mediums with oxygen concentrations between 25 mol % and 95 mol %.