Tank, in particular for a liquid hydrogen reservoir, provided with at least one dome fixed by way of an outer welded joint

A method for maintaining a tank, said tank comprising:

• at least one central portion having at least one end referred to as free end and at least one dome having an end referred to as open end, said dome and said central portion joined together by arranging the open end of said dome on the free end of the central portion, the free end of the central portion comprising a first connecting element, the open end of the dome comprising, on an outer face of the dome, a second connecting element, and said first connecting element and said second connecting element configured to form, when the central portion and the dome are joined together, a protruding tab extending toward the outside of the tank and welded at a protruding end by a weld bead, wherein the protruding tab has a total length (L) which is greater than or equal to twice a depth (P) of the weld bead,
• wherein the method comprising:
• a cutting-out step, including cutting out a part of a protruding tab having an initial length (L1), said cut-out part corresponding at least to a welded protruding end of said protruding tab having a weld bead, and said cut-out part having a length which is greater than a depth (P) of said weld bead;
• and
• a removing step, including opening the tank having at least one dome and a central portion by separating at least said dome from said central portion, which are no longer fixed to one another, allowing access to the tank in order to carry out maintenance operations.