Charlotte Pipe’s Tech Tools is an app for mobile devices that provides simple on-the-go tools for the plumbing industry. The expansion and contraction calculator provides general direction in expansion loop, offset or change-of-direction design to account for the effects of expansion and contraction in both PVC and CPVC systems. The temperature derating calculator allows users to calculate the operating pressure of PVC and CPVC piping systems as the operating temperature increases above 73° F. The app can be downloaded on the Apple, Google and BlackBerry platforms.