EFFECT OF HEAD PRESSURE IN MEASURING GREEN SAND PERMEABILITY

19990417
Journal: Transactions of the American Foundrymen's Society V 107 Paper No 99-86 P 43-50, 1999 (8 p)
Author: Bastic, B A; Blesch, E V; Nelson, R M; Thomas, P L

A means to verify a traceable calibration of a permeability test machine was researched. A test fixture was built that would allow for the measurement of process variables that occur during a permeability test. The results show that the AFS standard equation for permeability will provide different permeability values for the same orifice if different head pressures are used. The inconsistency in head pressure between permeability test machines is the major contributor to the inconsistent indicated permeabilities.