Patent ID: 8307990

Claim:
A filter module comprising a metal outer casing with inside and outside diameters providing at each end with a respective metal support plate of a larger diameter for supporting at least one filter element for obtaining a filtrate that is recovered via an outlet passage provided in the vicinity of each support plate, each outlet passage presenting a flow section having at least one generator line tangential to the inside face of the adjacent support plate, wherein each support plate is extended axially at a distance of at least 50 mm at right angles thereto by a metal assembly skirt which is unitary with the support plate, the assembly skirt having inside and outside diameters equal to the inside and outside diameters of the casing, wherein the casing and skirt align when joined each support plate being welded to the casing by a bead of metal welding material to form junctures beyond each outlet passage, the bead of welding material being spread uniformly over outside surfaces and inside surfaces of the assembly skirts and casing to avoid microscopic defects that present zones in which liquid might stagnate, wherein each support plate possesses internally a rounded connection fillet leading to the assembly skirt, each rounded connection fillet having a radius lying in a range of 0.2 mm to 5 mm.