Granted Patent B2

US 8,398,460 · App. 12/440,559 · Granted Mar 19, 2013

Abstract

Claims (14)

1. A pipe cleaning apparatus for attachment to a pipe to be cleaned, and operable to dispense abrasive particulate material into a stream of gas within such a pipe to be cleaned, comprising:

a pressurised hopper for receiving particulate abrasive material;

a pressurised conveyor coupled to the hopper and comprising a housing having an inlet for receiving particulate material from the hopper in a first direction, an outlet for delivery of particulate material from the housing in a direction substantially parallel to the first direction, and a screw located within the housing to transport particulate material from the inlet toward the outlet in a second direction substantially transverse to the first direction, wherein the outlet is shaped for attachment to the pipe to be cleaned and configured to deliver the particulate material into a stream of gas; and

an air feed in communication with the outlet and providing the stream of gas into a pipe to be cleaned, the stream of gas travelling at a velocity sufficient to achieve a turbulent flow into which the particulate material is delivered.

2. The apparatus of claim 1 , wherein the hopper and the conveyor are pressurized to a predetermined pressure.

3. The apparatus of claim 1 , wherein the particulate material comprises one or more of flint, chert, and granite.

4. The apparatus of claim 1 , wherein the conveyor feeds particulate into a gas stream at between 200 and 400 kg per hour.

5. The apparatus of claim 1 , wherein the screw is hydraulically powered.

6. The apparatus of claim 1 , wherein the conveyor drives the screw in either a forward or an opposing reverse predetermined direction.

7. A method of cleaning pipes comprising:

providing an air stream within a pipe to be cleaned, the stream including an air stream of a gas travelling at a velocity sufficient to achieve turbulent flow;

providing an apparatus in communication with the air stream for dispensing abrasive particulate material into the air stream of gas, the apparatus comprising a pressurised hopper for receiving particulate abrasive material and a pressurised conveyor coupled to the hopper, the conveyor including a housing having an inlet for receiving particulate material from the hopper in a first direction, an outlet for delivery of particulate material from the housing in a direction substantially parallel to the first direction, and a screw located within the housing for transporting particulate material from the inlet toward the outlet in a second direction that is substantially transverse to the first direction, the outlet being shaped to engage an end of a pipe to be cleaned;

providing abrasive particulate material into the hopper; and

operating the conveyor so as to rotate the screw and move the particulate material through the conveyor, directly into the turbulent flow of the air stream, and then into the pipe to be cleaned.

Assignments (6)