Hydrocyclone in Palm Oil Mill are use to recover kernel from the cracked mixture, it further separated the remaining fine kernels from the shell. The working principle of the cyclone is by utilizes fluid pressure energy to create rotational fluid motion. A rotational motion is created by which the heavy shell particles are thrown outwards the walls by the centrifugal force, the shell particles which have reached the walls, discharges through the apex of the bottom cone discharge outlet. Simultaneously the light kernel particles are concentrating in the center axis of the cyclone; it will flow out from the top of the cyclone disharge outlet.