Patent ID: 8109009

Claim:
Seal apparatus comprising a rotatable cylinder, a housing spaced radially outward from the cylinder, an annular outer seal holder having an L shaped cross section, a cylindrical first section of the annular holder being axially extending and concentric with the cylinder and having first and second axial ends, the first end connected to the housing, a second section of the holder further comprising an annular radially extending flange connected to the second end of the cylindrical first section, an annular backing plate mounted on the flange, the backing plate having first and second annular sections, the first annular section of the backing plate having a radially inward extending guide portion, the second annular section of the backing plate having an inner diameter larger than an inner diameter of the guide portion, adjoined annular seal retainer segments connected to the second annular section of the backing plate, the radially extending flange, the first and second sections of the backing plate and the seal retainer segments having aligned bolt receiving holes, bolts extending through aligned bolt receiving holes, holding the first and second sections of the backing plate and the seal retainer segments assembled, a cylindrical space between the radially inward extending guide portion of the backing plate and the seal retainer segments, sealing elements further comprising segmental sections, the segmental sections having radially outwardly extending holder plates positioned in the cylindrical space, and axially retained between the radially inward extending guide portion of the backing plate and the seal retainer segments, the segmental sections of the sealing elements further comprising partially cylindrical plates welded to the radially extending holder plates and engaging the cylinder or a wear plate on the cylinder and sealing against movement of gas between opposite axial sides of the seal apparatus.