High-pressure jetting device

A high-pressure jetting device can be nsed to clean them periodically. Iron ochre deposits can also be cleared in this way. 

However, it should always be borne in mind that high pressure and ultra high pressure jets are capable of easily cutting solid materials. Hence, they lead to severe and often lethal injuries when persons are hit. The high pressure jet liquids are often contaminated and can enter deeply into body tissue thus causing inflammations in addition to injuries. The equipment should therefore only be used by informed and experienced personnel. If possible, mechanically guided jet cleaning devices should be applied. 

Hartmann whistles have also found application in process technology by utilization of the sonic energy for the dispersal of liquids. So-called Liquid whistles serve to produce emulsions and dispersions. A high pressure flat jet of liquid impinges on the edge of a thin blade. Such devices have been used to produce insecticide emulsions, and also, probably, dispersions of other agents... 

Another relatively simple method of reducing wet pickup is the use of the Machnozzle system. Fig. 2.3, - a machine similar in principle to air-jet ejectors. In this device, high pressure steam is used to push excess liquid out of the fabric, leading to very low wet pickups, especially for synthetic fabrics. 

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