The Spiral Groove Seal is a self-acting device that uses the fluid flowing between its faces to lift the sealing faces from each other. Thus, it is also referred to as a non-contacting face seal. In this paper we utilized a full 3D Navier-Stokes equations solver (CFD-ACE+) to study the flow patterns inside an inward pumping spiral groove seal CFD-ACE+ (http://www.cfdrc.com) is a commercial software package that has inherited many advanced features implemented in a research code SCISEAL[1] developed by CFD Research Corporation for NASA Glenn (Lewis) Research Center (1992-96).