A shaft of 20 cm diameter has a speed of 2500 rpm and runs in a bearing which has a length of 1.2 times the diameter. The bearing pressure is 7 kgf/cm2 and the coefficient of friction at the bearing surface is 0.006. Calculate the horse power lost in friction. The oil flow through the bearing controls the temperature of the bearing. If the difference between the outlet temperature and that at inlet is 20°C, obtain the quantity of oil required if the specific heat is 0.45 and specific gravity is 0.88. Determine the pipe size for (i) oil inlet if the maximum velocity of flow is 1.25 m/sec and (ii) oil drain, the drain to run half full with a maximum oil velocity of 0.15m/sec.