Hydrocyclone

A hydrocyclone for removal of sand or other heavier particulate material from a continuous medium of liquid and sludge, the hydrocyclone comprising:

• at least one inlet;
• a hydrocyclone body with a cylindrical part and a conical part or a transitional cylinder-cone body;
• a reject outlet in the narrow end of the conical body and an accept outlet at the end of the cylindrical part of the hydrocyclone body;
• wherein the diameter of the at least one inlet is ⅖ of the diameter of the hydrocyclone, within ±30%, or when the at least one inlet is volute, rectangular or has other cross section shape than circular, a cross-section area of the at least one inlet corresponding to a circular inlet with diameter ⅖ of the diameter of the hydrocyclone, within ±30%;
• wherein the diameter of the hydrocyclone is the diameter of the cylindrical part or the diameter of the widest end of the conical part of the hydrocyclone body, the diameter of the accept outlet or vortex finder is ⅗ of the hydrocyclone diameter, within ±30%;
• wherein the diameter of the reject outlet is ⅕ of the hydrocyclone diameter, within ±30%;
• wherein the length of the conical part of the hydrocyclone is between 1 and 3 times the hydrocyclone diameter;
• wherein the length of the cylindrical part of the hydrocyclone body is between 1 and 2 times the hydrocyclone diameter;
• wherein the control devices consist solely of static, non-adjustable parts, thereby functioning autonomously and continuously;
• wherein the hydrocyclone, when in operation, (1) is oriented with the reject outlet directed upward from horizontal and (2) is configured for automatous and continuous removal of sand or other heavier particulate material from a continuous medium comprising liquid and sludge.