Corrosion resistant filter unit

Claim 1

A fluid filter assembly adapted for the filtration of corrosive fluid to be injected into a well bore at pressure levels which may exceed 10,000 pounds per square, said filter assembly comprising: a frame assembly for the mounting of a portion of said fluid filter assembly therein, the frame assembly including: a plurality of longitudinally extending sole plates; a plurality of struts laterally linking the plurality of longitudinally extending sole plates at least two of the plurality of struts having a rectangular cross-section being adapted for use in lifting said fluid filter assembly by inserting a lifting member therein; a plurality of vertical corner support columns, each vertical corner support column of the plurality of vertical corner support columns having one end thereof secured to a longitudinally extending sole plate of the plurality of longitudinally extending sole plates; a plurality of longitudinally extending members, each member having the ends thereof secured to a vertical corner support column of the plurality of vertical corner support columns; a plurality of laterally extending members, each member having the ends thereof secured to a vertical corner support column of the plurality of vertical corner support columns; and a plurality of supports extending upwardly from and secured to selected struts of the plurality of struts laterally linking the plurality of longitudinally extending sole plates, each support of the plurality of supports having a collar formed on the upper end thereof; a plurality of filter pods, the plurality of filter pods forming at least two banks of filter pods, each bank having at least two filter pods therein, each bank of the filter pods being supported by one or more the supports of the plurality of supports secured to selected struts of the plurality of struts of the frame assembly; an inlet manifold to direct said corrosive fluid to the plurality of filter pods, the inlet manifold being interconnected to the banks of filter pods formed by the plurality of filter pods whereby flow of said corrosive fluid can be directed to each bank of the filter pods; an outlet manifold to direct said corrosive fluid from the plurality of filter pods, the outlet manifold being interconnected to the banks of filter pods formed by the plurality of filter pods whereby the flow of said corrosive fluid can be directed to each bank of the filter pods and being interconnected to the inlet manifold whereby said corrosive fluid can be directed from the inlet manifold to the outlet manifold; a first valve means to control the flow of said corrosive fluid between banks of filter pods formed by the plurality of filter pods whereby the flow of said corrosive fluid can be selectively directed to each bank of the filter pods; a second valve means to selectively control the flow of said corrosive fluid between the inlet manifold and the outlet manifold; and union means for interconnecting the filter pods, inlet manifold and outlet manifold, each of the union means including mechanical connection means and internal seal means for isolating said corrosive fluids from the mechanical connection means; wherein said fluid filter assembly is adapted for use in the filtration of corrosive fluid to be injected into a well bore at pressure levels which may exceed 10,000 pounds per square inch or more while said filter unit comprises a plurality of filter pods, an inlet manifold, an outlet manifold, first valve means and second valve means inconnected by union means to eliminate any welded connections therebetween and facilitate the operation and maintenance of the filter pods.