High pressure casing access cover

A compressor assembly, comprising:

• a casing having an inner surface defining an interior chamber, an opposing outer surface, and at least one access opening extending between the casing inner and outer surfaces;
• and
• at least one closure device having a plug portion and a head portion, the plug portion being disposeable at least partially within and configured to substantially obstruct the at least one access opening, and the head portion having a shoulder surface extending generally radially outward with respect to the plug portion, the shoulder surface being generally biasable against the inner surface of the casing by pressure within the casing so as retain the plug portion disposed within the at least one access opening.

A closure device for at least one access opening of a compressor casing, comprising:

• a plug portion disposeable at least partially within the at least one access opening, wherein the plug portion is configured to substantially obstruct the at least one access opening;
• and
• a shoulder portion extending generally radially outward from the plug portion, wherein the shoulder portion is generally disposeable against an inner surface of the compressor casing, such that pressure within the casing forces the shoulder portion into contact with the inner surface to retain the plug portion disposed within the at least one access opening.