You also need to analyse your piping according to the requirements of ASME B31Ea-2010 edition. In this code, SAM is included in the analysis. The seismic +/-U, +/-SAM at all directions should be combined first using SRSS before adding to the sustained loads. The +/-SAM at all directions should be combined first using SRSS before adding to pure thermal expansion range and determine the full displacement range. Remember to use only the amplitude of U and SAM.