I would start by drawing an FBD and computing the resultant forces of the pipe based on its present loading conditions. I would then make a table for each resultant force taking up the cells on the left side of the table and each critical point on the pipe on the top cells of the table. Then for the corresponding load and point on the pipe, I would compute the applied stress from the respective load. That way I can have a sum of the stresses at each critical point at the bottom of the table.