Both are tori primitives and should be included in the official library. I don't know, for what they are used in the petrol station.
Please see "Circular torus" under http://www.ldraw.org/library/primref/#curv3d for more informations
/Max
Please see "Circular torus" under http://www.ldraw.org/library/primref/#curv3d for more informations
/Max