Pipeline strainer

A pipeline strainer comprising:

• a cavity;
• a screen assembly disposed in the cavity, the screen assembly having an open first end and an open second end, the screen assembly includes a first screen and a second screen, the first and second screens each being perforated with holes having the same hole diameter, the first and second screens are nested tubular screens such that the first screen is within the second screen, the first screen is movable relative to the second screen in order to offset the holes of the first screen relative to the holes of the second screen, such that the screen assembly has a hole size corresponding to the overlapping portions of the holes of the first and second screen, and a screen axis extending from the open first end to the open second end;
• a fluid inlet arranged at the open first end of the screen assembly, such that the fluid inlet is open to an interior of the screen assembly;
• a fluid outlet adjacent the open first end of the screen assembly, wherein the fluid outlet is open to a straining surface of the screen assembly;
• and
• a fluid axis extending from the fluid inlet to the fluid outlet;
• wherein the fluid axis crosses the screen axis at or near the fluid inlet.