Reinforcement-free tank for an electromagnetic apparatus

An electromagnetic apparatus comprising:

• a reinforcement-free tank to accommodate a core of a transformer and at least one winding of the transformer immersed in a fluid, the tank comprising:
• a pair of mutually-opposite side walls, each of said side walls having at least one curved segment defining a vertically-curving profile between a top edge and a bottom edge of a side wall;
• a pair of mutually-opposite end walls, each of said end walls having a substantially vertically-extending semi-cylindrical shape defining a vertically-straight profile between a top edge and a bottom edge of an end wall;
• vertically-extending joining members, each of said joining members being configured to provide a transition between the vertically-curving profile of a side wall and the vertically-straight profile of a corresponding end wall, wherein the walls can withstand vacuum and/or overpressure conditions which can develop in the tank without a reinforcing member connected to the walls;
• a top for covering a top opening of the tank;
• and
• a support structure including a surface continually joined along a length thereof to an underside of the top, the support structure further arranged to support at least one component of the electromagnetic apparatus disposed inside the tank, wherein the walls and the top are formed to withstand the vacuum and/or overpressure conditions without further reinforcing members connected to the top.