The piston of a double acting reciprocating pump has a diameter of 100 mm and a stroke of 250 mm. The pump has a vertical suction pipe of 5 m long and its diameter is 100 mm. The pump runs at 90 double strokes per minute and motion is considered to be simple harmonic. Calculate the maximum permissible suction lift assuming that separation occurs at 2m of water absolute. Take atmospheric head as 10.2 m of water.