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materials like glass, stone, marble, granite, etc., submerged cutting offers two big advantages: reduced noise a typical abrasive waterjet stream travels over three times the speed of sound and as it travels through the air, the turbulent passing air generates noise levels over db, even as high as db. by
results in an abrasive jet stream that "rooster tails" back into the environment for the duration of the pierce, anywhere from just a few seconds on the thin materials, up to several minutes, depending on the thickness and hardness of the material. if the material is not submerged, that diffused stream shoots...
https://www.techniwaterjet.com/accessories/water-raise-lower-for-submerged-cutting/