Domed diaphragm / insert plate for a pressure vessel access closure

摘要

A pressure vessel closure for an access opening that has a sealing surface surrounding the access opening and one of either a diaphragm or insert that spans the access opening with a peripheral flange that rests on the sealing surface. The insert or diaphragm has a continuously rounded portion that extends into the access opening and a cover extends over the insert or diaphragm. A gasket is interposed between the flange of the insert and the sealing surface or a fillet weld attaches the flange of the diaphragm to the sealing surface. A locking device secures the cover to a wall of the pressure vessel and urges the flange against the sealing surface.

主权项

1. A substantially rigid steam generator pressure vessel having a wall with an access opening of 2 in. (5.1 cm) or larger and a closure for the access opening comprising:
a sealing surface on said wall surrounding the access opening; one of either a male or female locking device formed on or in said wall radially outward from said sealing surface at a plurality of locations around said access opening; an insert positioned to span said access opening, said insert having a peripheral flange that rests over at least a portion of said sealing surface and a continuously rounded concave portion completely extending between opposing sides of an inner edge of the flange and completely closing off the access opening with the rounded concave portion extending into the access opening; a sealing member between the sealing surface and the flange of the insert; a cover extending over the access opening and the insert and extending radially outward to at least said one of either the male or female locking device; and the other of the male or female locking device connecting the cover to the wall by engaging the one of the male or female locking device and pressuring the cover against the flange of the insert.