| abstract |
The invention relates to a circuit for cryogenic liquids which contain small amounts of foreign products with higher melting and boiling points. In order to avoid the formation of deposits or concentrations of foreign products, most of the pipes or all the pipes (7, 8) located outside the tank (2) have at least locally (11, 12) a slope descending towards the tank (2) and the siphon-forming parts (13), the closed parts and various parts of the pipes (7) and accessories in which the cryogenic liquid cannot return by gravity to the tank (2) are provided with 'drainage orifices (14, 15) or drainage pipes (16, 17) which open into the tank (2) and / or into at least one additional collection tank (6). |