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The supplied 3D DGN file contains a handful of piping elbows. They are type 18 elements. Some are nested in a type 2 cell. They were probably imported from an unknown third-party plant design tool.
MicroStation's built-in volume measurement tool can't measure the volume of an elbow. mdlMeasure_volumeProperties fails with an indeterminate error (none of the documented error codes). It doesn't fail with MDLERR_NONCLOSEDELM, which I would expect if it objected to measuring the volume of a surface.
What's wrong with those elbows? Should they be converted to a type 19 solid or a SmartSolid to enable a measurement?