A vessel, particularly a pressure vessel, has a tubular housing part (10) in which a cover part (12) can be secured. Support segments (18) are inserted at least in some areas in a recess (14) on the interior (16) of the housing part (10). These segments provide support to the cover part (12) when it is installed. At least one fixing device (22) ensures a releasable engagement between cover part (12) and at least one of the support segments (18).