itself is reciprocated through directionally drilled holes to the advancing cut typical pressures would be from 2 000 psi to 10 000 psi controlled by a spring loaded pinch valve on the recirculation line which automatically limits the pressure in the line circulation rates are sufficient to prevent particles from settling out and to keep temperature uniform holes or hardened ports in the forward facing surface of the tube eject the heated liquid into the soil at high kinetic energy causing the soil to be eroded and substantially replaced by the molten paraffin this allows the tube to advance forward laterally these ports or u201c jets u201d may be fabricated by brazing a tungsten carbide nozzle flush with the surface of the tube portions of the surface of the tube may be covered with an abrasive grit such as tungsten carbide imbedded in an epoxy coating or by weld deposited hard facing rotating both ends of the tube slightly after each pulling stroke allows for a single jet to cut a path wider than the tube an example of such a rotation sequence would be 0 u00b0 5 u00b0 0 u00b0 u2212 5 u00b0 0 u00b0 5 u00b0 by rotating the tube in small increments it is possible to sweep the entire soil area in front of the tube with a fixed position jet in previous tests of soil jetting devices the inventor has noted that the width of the cut formed by a single jet varies significantly with soil type and jetting factors if the jets do not make a cut at least as thick as the diameter of the tube then the device can not advance except by mechanical abrasion the ends of the pipe may be automatically rotated by a mechanical u201c.