The ornamental design for an ibctank, as shown and described.
FIG. 1 is an upper front perspective of an IBC tank embodying my design;
FIG. 2 is a top view of the IBC tank shown in FIG. 1;
FIG. 3 is a front elevation of the IBC tank shown in FIG. 1 and 2, with the opposite rear elevation being a mirror image thereof;
FIG. 4 is a front elevation of the IBC tank similar to FIG. 3, but with portions of corner sling adapters being broken away to depict lifting lugs;
FIG. 5 is a right side elevation of the IBC tank shown in FIGS. 1-4, with the opposite side elevation being a mirror image thereof;
FIG. 6 is a right side elevation of the IBC tank similar to FIG. 5, but with portions of corner sling adapters being broken away to depict the lifting lugs;
FIG. 7 is a side elevation of the IBC tank taken along line 7-7 in FIG. 2; and,
FIG. 8 is a side elevation of the IBC tank similar to FIG. 7, but with portions of corner sling adapters being broken away to depict the lifting lugs.
The broken lines showing walls and feet of the tank, the bung in the top wall, the rim forming an opening in the top wall, and the corner sling adapters are directed to environment and/or are for illustrative purposes only. None of the broken lines form part of the claimed design.