We claim the ornamental design for a pipe coupling segment, as shown and described.
FIG. 1 is an isometric view of a design of a pipe coupling segment according to our invention;
FIG. 2 is a front view of the pipe coupling segment shown in FIG. 1;
FIG. 3 is a back view of the pipe coupling segment shown in FIG. 1;
FIG. 4 is a left side view of the pipe coupling segment shown in FIG. 1, the right side view being identical;
FIG. 5 is a top view of the pipe coupling segment shown in FIG. 1; and,
FIG. 6 is a bottom view of the pipe coupling segment shown in FIG. 1.
The broken line showing of the portions of pipe coupling segment is included for the purpose of illustrating portions of the article and forms no part of the claimed design.