1.1 ,This practice covers flow conditioners that produce a fully developed flow profile for liquid and gas phase fluid flow for circular duct sizes 1- to 60-in. (25.4- to 1525-mm) diameter and Reynolds Number (Re) ranges from transition (100) to 100 ,000 ,000. These flow conditioners can be used for any type of flow meter or development of a fully developed flow profile for other uses.