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When importing a CAD file or Shapefile of a pipe network into WaterCAD, WaterGEMS or HAMMER, only the pump station polygon element is available to map to in the field mapping step. (not pipes)
This is an indication that the layers in your file are of the polygon shape type, in which case only the pump station polygon element can be mapped to. If you actually have pipes in the file, this may occur if a custom element or shape is included at the ends of the polylines in the CAD file. If the element is removed from the end of the line or polyline, the line element will be recognized correctly by ModelBuilder.
Also check to make sure that your pipes in the source file are indeed polylines, and not for example polygons outlining the pipes.
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