Abstract: A seal for sealing a gap between rotatable shaft and a vessel wall includes an adapter plate fixed to the vessel wall. A stator plate is attached to the adapter plate. An interfacing boot rotates with the rotatable shaft and has a lip in sliding contact with the stator plate. A central boot is sealingly engaged with and rotates with the rotatable shaft. A drive ring rotates with and is axially movable with respect to the rotating shaft. An anchor ring is fixable non-rotatably and axially to the rotatable shaft. A bias member urges the anchor ring and the drive ring apart. A compression member compresses the bias member, and upon release the bias member urges the drive ring forwardly from the anchor ring. A sealing method includes steps for assembling the seal.

Abstract: A seal for placement between a cylindrical shaft and a drum rotatably mounted with respect thereto includes an outside end member with a shaft section, a bore and a gas input connection and an inside end member non-rotatably attached thereto and configured to engage the shaft section. An outer end seal and an inner end seal are slidably and rotatably engaged with the shaft section. A circumferential seal is configured to non-rotatably engage with the outer and inner end seals. An interference fit is formed in the axial direction between an inner assembly, comprising the circumferential seal and the outer and inner end seals, and the outside and inside end members. An interference fit also is formed radially between the circumferential seal and a drum of a mixing machine. A method provides a seal for placement between a cylindrical shaft and a drum rotatably mounted with respect to the shaft.