Abstract: A closure [10] for a cylindrical vessel includes at least one holding means [30] configured to move the closure into a fully closed state, the holding means having a predetermined actuation force or torque to properly close the closure, the closure including one or both of the following failsafe failure detection features: a mechanical fuse [20] having a predetermined load failure force below that of a load failure force of at least one component of the holding means and above that of a predetermined actuation force or torque to properly close the closure; or a block[40] sized to at least partially overlap a pressure warning lock hole [19] of the closure door when the closure is not in the fully closed state and to fully expose the pressure warning lock hole when the closure is in the fully closed state, thereby permitting insertion of a pressure warning lock [17].

Abstract: A pipeline isolation tool (10) with a circumferential seal (30) having a T-shaped cross section. The seal has a radially oriented lower seal profile (36) and an axially oriented upper seal profile (38). Pressure heads (40, 50) are located on either side (32, 34) of the lower profile. Overlapping structural elements (60, 80) are located on either side (32, 34) of the upper profile and include a concave area (70, 90) for receiving a portion of the upper seal profile. The inner face (64, 84) of the structural elements contact the outer surfaces (42, 52) of the pressure heads. Angle plates (100, 110) define an inner face (102, 112) that contacts an outer face (66, 86) of each of the structural elements. The tool may be configured as an intrusive tool or as a non-intrusive tool.

Abstract: A closure [10] for a cylindrical vessel includes at least one holding means [30] configured to move the closure into a fully closed state, the holding means having a predetermined actuation force or torque to properly close the closure, the closure including one or both of the following failsafe failure detection features: a mechanical fuse [20] having a predetermined load failure force below that of a load failure force of at least one component of the holding means and above that of a predetermined actuation force or torque to properly close the closure; or a block[40] sized to at least partially overlap a pressure warning lock hole [19] of the closure door when the closure is not in the fully closed state and to fully expose the pressure warning lock hole when the closure is in the fully closed state, thereby permitting insertion of a pressure warning lock [17].