A single acting reciprocating pump has a plunger 10 cm diameter and a stroke of 200mm. The centre of the pump is 4m above the water level in the sump and 14m below the level of water in a tank to which water is delivered by the pump. The diameter and length of suction pipe are 40 mm and 6 m respectively while those of delivery pipe are 30mm and 18 m respectively. Determine the maximum speed at which the pump may be run without separation, if separation occurs at 7.848 N/cm2 below the atmospheric pressure. Take atmospheric pressure head = 10.3 m of water