Symbol
The above image shows the standard vertical vessel with two symbol primitives attached.
Following is the description for those elements:
element LADDER1 with geometry = symbol library = "C:/PlantWise8.11.12/projects/PlantWise-demo/msj/symbols/heater-test" cell-name = "ladder" x-scale = .9 y-scale = .9 local-y-origin = (-0.5 * equipment.diameter) - 5.0 local-z-rotation = -85 element PLATFORM with geometry = symbol library = "C:/PlantWise8.11.12/projects/PlantWise-demo/msj/symbols/heater-test" cell-name = "l_pltf" x-scale = 0.75 y-scale = 0.75 local-y-origin = (-0.5 * equipment.diameter) local-z-origin = 90.0 local-z-rotation = 30