Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1991017000) TANK WASHING EQUIPMENT
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters
CLAIMS

1. A tank washing system comprising at least one row of jet nozzles spaced apart across a tank, means supplying a jet of washing medium directed via said nozzles at least at the tank bottom, initially in one end region thereof, and means for swinging the nozzles forwardly and upwardly through an arc to direct said medium progressively along the tank bottom thus to generate a surge or wave of said medium which sweeps along the tank bottom from said one end region towards the other end thereof and entrains settled solids therein.

2. A tank washing system according to Claim 1, including two or more such rows of jet nozzles supplied with washing medium, means for swinging said rows successively such that a first row sweeps an initial part of the length of the tank bottom, and the or each succeeding row of nozzles is swung forwardly and upwardly to sweep a region of the tank bottom forwards of that swept by the immediately preceding row, and means such that the velocity of flow of washing medium from the or each succeeding row of nozzles is greater than that from the preceding row such that the velocity at which the washing medium is projected from the nozzles increases progressively as said wave sweeps along the tank .

SUBSTITUTE SHEET

3. A tank washing system according to Claim 2, wherein said rows of nozzles are supplied with washing medium successively and means are provided to commence directing washing medium from each succeeding row of nozzles before the flow from the immediately preceding row is discontinued thereby to provide a slight overlap and thus avoid hydraulic shock loading.

4. A tank washing system according to Claim 2, wherein said first row of nozzles is located at a position spaced inwardly from the adjacent end of the tank and is adapted to direct washing medium at the tank bottom initially at said adjacent end, at the commencement of its swinging motion.

5. A tank washing system according to any preceding claim, including a washing medium supply system which consists of a storage vessel for the washing medium, one or more level sensors to maintain a predetermined level of washing medium therein, one or more delivery pumps for supplying washing medium to the storage vessel, one or more rotatable supply pipes to which said nozzles are connected, and a plurality of valves to control the supply of washing medium selectively to said rows of nozzles.

SUBSTITUTE SHEET

6. A tank washing system according to any preceding claim, including means to ensure that, in a set of three rows of nozzles, the nozzles of the first row may direct washing medium at a pressure of 2 - 5 bar whilst the second row issues at 4 - 8 bar and the third at 7 - 10 bar.

7. A tank washing system according to Claim 2, wherein the nozzles of the or each succeeding row are of greater length than those of the preceding row.

8. A tank washing system according to Claim 5, wherein means for rotating said supply pipes includes one or more linear actuators connected by a radial arm to its associated pipe.

9. A tank washing system according to any preceding claim, wherein the sweeping movement of the or each row of nozzles is controlled by a variable speed motor connected to a computerised control device.

10. A tank washing system according to any preceding claim, wherein the orifice of each nozzle is configured to create a wide footprint which overlaps that issuing from adjacent nozzles in the row.

11. A tank washing system according to any preceding claim, including means for rotating each

SUBSTITUTE SHEET nozzle about its longitudinal axis in an oscillating manner such that washing medium is directed therefrom in a side-to-side motion as the nozzle is swung forwardly .

12. A tank washing system according to any preceding claim, adapted for washing a tank divided into three separate longitudinal sections, by shut-off valves to sectionalise groups of nozzles in the or each row so that each tank section may be washed individually .

13. A tank washing system substantially as hereinbefore described with reference to, and as illustrated in, the accompany drawings.

SUBSTITUTE SHEET