The ornamental design for a pipeinsulation, as shown and described.
FIG. 1 is a front perspective view of two lengths of pipe insulation having inter-connecting ends in a view showing male ends thereof;
FIG. 2 is a rear perspective view of two lengths of pipe insulation having inter-connecting ends in a view showing female ends thereof;
FIG. 3 is an end view of pipe insulation as a form having two halves as an outer layer; and,
FIG. 4 is a side view of two lengths of pipe insulation having inter-connecting ends.
The dashed broken lines shown in the drawings depict environmental subject matter that form no part of the claim.
The pipe insulation is shown with a symbolic break in its length. The appearance of any portion of the pipe insulation between the break lines forms no part of the claim.