Unlike a drainage system where the pipes are laid at 60cm depth and require considerable manpower and material, our mobile vacuum system pipes are laid on the surface. Rubber steam hoses are connected to a central suction pipe that consists of galvanised quick coupling pipes. The rubber hoses are spaced evenly at 1.50m. The ends are placed in the soil to the desired steaming depth. The suction pipes can be quickly and easily positioned and connected to the turbine. A special steaming sheet is spread over the area to be steamed, as in normal sheet steaming. The sheet is weighted down so that no steam can escape. The steam is conducted under the sheet using an injector with protective tunnel. When steaming smaller areas, up to 30m long, the steam is conducted under the sheet from the front; for larger areas, the steam is injected into the middle of the bed, with a T-connection branching out to both sides. As soon as the sheet is inflated to approximately 1m by the steam pressure, the suction turbine is switched on. First, the air in the soil is removed via the suction hoses. A vacuum is formed and the steam is pulled downward. During the initial stage, the pressure under the sheet is sucked out quickly and the turbine switches off frequently.
With increasing saturation, the ventilator runs for longer periods of time and switches off less frequently. During the final phase, when the required steaming depth has been reached, the ventilator runs non-stop and surplus steam is blown out. To ensure that this surplus steam is not lost, it is fed back under the sheet. As with all other steaming systems, a post-steaming period of approximately 20 - 30 minutes is required. Steaming time is approximately 1 hour per 10cm steaming depth. The steam requirement is approx 7 - 8 kg/m². The most important requirement, as with all steaming systems, is that the soil is well prepared before steaming, to ensure optimum results. This simple and reasonably priced system can be used with boilers from 350kg steam capacity upwards. | 
