Abstract: A fluid pressure vessel has a chamber with an inlet and outlet with a nested primary and secondary filter bag disposed such that the primary bag communicates exclusively with the inlet, and flow through the primary bag flows through the secondary bag before the outlet. The primary bag is disposed in a first rigid porous basket and the bag rim seals against a flange on the first basket. The secondary filter bag surrounds the first basket and the rim of the secondary bag is sealed around the flange of first basket. A second rigid porous basket surrounds the secondary filter bag and is sealed on the rim of the secondary filter bag and is sealed against the inner periphery of the pressure chamber by an O-ring.

Abstract: A pressurized fluid filtering vessel of the type having a rigid porous container which may be a basket filled with filtering material has a barrier disposed in the outlet such that, in the event of structural failure of the container, particles of the container are prevented from entering the outlet of the pressure vessel. In one version, the barrier comprises a grid and in another version, the barrier comprises a perforated plate.

Abstract: A fluid pressure vessel has a chamber with an inlet and outlet with a nested primary and secondary filter bag disposed such that the primary bag communicates exclusively with the inlet, and flow through the primary bag flows through the secondary bag before the outlet. The primary bag is disposed in a first rigid porous basket and the bag rim seals against a flange on the first basket. The secondary filter bag surrounds the first basket and the rim of the secondary bag is sealed around the flange of first basket. A second rigid porous basket surrounds the secondary filter bag and is sealed on the rim of the secondary filter bag and is sealed against the inner periphery of the pressure chamber by an O-ring.

Abstract: A cover is provided for a removable pressure vessel lid and the cover has a peripheral flange extending over the interface of the lid and pressure vessel to direct escaping pressurized fluid away from the operator upon release of the lid fasteners. In another version, the peripheral flange is provided on the lid.