OIML G18 Controlled Vocabulary Julia Neumann 2022-12-16 2023-01-02 10:32:57 en-EN external floating roof #01627 a tank roof which forms part of the external surfaces of the tank but which floats freely on the surface of the liquid, except at low levels when the weight of the roof is taken on its supports on the tank bottom 2022-12-19 09:13:31