Kjetting

Kjetting is a term used to describe techniques that rely on jets of liquid or gas to achieve a task. In practice, kjetting encompasses methods where a precisely directed jet is used to erode, cut, clean, mix, or transport material. The concept is widely applied in industrial and civil contexts, often under the broader English term jetting.

The most common form is high-pressure water jetting, where pumps generate streams of water at very high pressure to remove deposits, clean surfaces, or clear pipelines. Abrasive jetting adds finely divided abrasive particles to the jet to enhance cutting or cleaning performance. Jetting can be applied to surfaces, interiors of pipes, and large equipment to reduce downtime and extend service life. In geotechnical engineering, jetting is used in jet grouting, where high-pressure jets of grout mix soil in situ to create stabilized columns or foundations.

Equipment and operation involve high-pressure pumps, hoses or rigid lances, and specially designed nozzles. Operators control jet pressure, flow, angle, and movement, often using rotating or programmable tools to cover the target area evenly. Nozzle design and jet geometry determine cleaning or cutting effectiveness and the amount of recoil or vibration transmitted to the equipment and operator.

Safety and environmental considerations are central, given the high energies involved. Risks include hydraulic burns, flying debris, and slips from wet surfaces. Adequate personal protective equipment, proper training, containment of wash water, and adherence to local regulations are essential.

Regional usage varies; in Dutch-speaking contexts, the term kjetting is commonly used to describe these jet-based techniques, with terminology aligned to industrial cleaning, construction, and maintenance practices.