Randy A. Wacker, P.E. is a senior consultant for Inertech, Inc., where he develops sealing solutions for a wide range of pressure-containing equipment. He is the instructor for the ASME PD539 course titled Bolted Joints and Gasket Behavior, is a member of the ASME Special Working Group for Bolted Flange Joints, and is also a member of the ASTM F03 Sealing Committee. For more information, visit www.inertech.com.