In a process Plant, Pipes are used to transport fluid from one point to another or one equipment to another. When the fluid temperature is above the atmospheric temperature, the pipe will expand. If this expansion is restricted by means of a support or equipment, it will induce some forces and moment or stress in the piping and connected equipment. These thermal stresses and its allowable limits are calculated as per ASME (American Society of Mechanical Engineers) B31.3 code. This code also specifies the allowable limit for other type of stresses developed in the piping (For e.g.: stresses due to pressure, weight, wind etc.) and its allowable value. When the connecting equipment are far away, it will be routed through pipe rack which will provide more accessibility around the process plant. Pipe rack loops are employed for absorbing the thermal expansion of the pipes. In this project, dimensions of pipe rack loops for a process plant are optimized based on temperature, pipe size, pressure etc. The guidelines mentioned in ASME B 31.3 are used for designing the loops using Caesar II Software which is based on FEM. The analysis is carried out by assuming anchors at both the sides of the pipe rack loop which is a common practice in a process plant. © Research India Publications.