The following report outlines the results and conclusions from this Gas Machinery Research Council (GMRC) Pipe Support Stiffness project. This project addresses common challenges associated with the design of piping systems under vibratory loads. An industry-wide problem exists due to incorrect assumptions about of pipe support stiffness, a key variable for pipe stress and vibration analysis. There are no published stiffness values for the different types of clamp designs and different support structure designs. Furthermore, there is a lack of understanding about this issue and the consequences it has on vibration and reliability. There are many consequences to inaccurate piping and piping support designs. These have reliability and cost implications to the facility owner.