Patent ID: 8580006

Claim:
A filter lock and seal system for sealing a filter assembly to a tubesheet comprises: a) a filter assembly mounted to a top end cap; b) wherein the top end cap includes a smooth flat annular seat portion extending longitudinally from the top of a lower flange at an annular radially inward protrusion and terminating at an annular radial outward projecting shoulder; c) the filter assembly further includes a snap band for installing the filter assembly into a tube sheet opening and sealing the filter assembly to the tubesheet; d) wherein the snap band including a band cavity for engaging with a tubesheet end of the tube sheet opening in an installed position; e) wherein the snap band including a C shaped curled strip defining the band cavity; f) wherein the snap band includes a flexible cover encapsulating the snap band, and the flexible cover includes a deformable portion covering over the band cavity which deforms into the band cavity in the installed position; g) wherein the radial outward projecting shoulder positioned just below the snap band such that the entire inner side of the snap band contacts the smooth flat annular seat portion and the radial outward shoulder contacts and abuts against the snap band bottom side at a snap band bottom corner.