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For the adaptation of the abrasive water jet to dismantling of contaminated structures under water, a number of tests had to be carried out. It was necessary to design a special cutting head for underwater application and to test this equipment in a water basin and in a pressure chamber to find the influence of the water depth. The results showed the influence of important parameters such as pressure, traverse rate, geometry of the focusing nozzle, nozzle sample distance and abrasive feed rate on the cutting efficiency. Tests with different air mantle nozzles adapted to the cutting head demonstrated the possibility of increasing the maximum working distance under water. Tests carried out in the pressure chamber showed the influence of higher ambient pressures (up to 5 bar) on the cutting performance. Tests with different abrasives showed that garnet and silica sand give the best cutting results regarding the depth of cut and the reduction of wear of the focusing nozzle. The comparison of cutting tests showed that it would be useful to raise the pressure range up to 4000 bar, and to use nozzles with a diameter up to 0.5mm only. These parameters result in low quantities of generated secondary waste and a good cutting efficiency.

Additional information

Authors: HAFERKAMP H, Universität Hannover, Hannover (DE);LOUIS H, Universität Hannover, Hannover (DE);MEIER G, Universität Hannover, Hannover (DE)
Bibliographic Reference: EUR 12684 DE (1990) 39 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-1288-0
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