Patent ID: 7374692

Claim:
A hydrocyclone for particle removal from ballast water, the hydrocyclone comprising a main cylinder with a main cylinder inside diameter Dc and a length, the main cylinder having a base, at least one inlet pipe as a point of entry of a feed stream into the main cylinder, an overflow orifice as a point of exit of an overflow stream out of the main cylinder, a vortex finder situated within the main cylinder, the vortex finder having an inner diameter and a length, a conical section extending from the base of the main cylinder and having a length, and an apex orifice formed at an end of the conical section, wherein the length of the main cylinder is from 1 to 0.97 times Dc, the length of the conical section is from 4.5 to 3.5 times Dc, and, at a feed stream flow rate of 125 m 3 /h, an overflow stream with a flow rate of 100 m 3 /h to 75 m 3 /h is produced.