Manual high pressure washing unit is recommended to be used at low volume production of large size work pieces. The washing system with steam shave unit is the most appropriate and least expensive solution for the pre-treatment of the subject work pieces.
In case of washing with steam shave, the pre-treatment of the work pieces can be done in either open or closed work places with the help of a steam beam degreasing device. If applied indoor, degreasing usually happens in a cabinet however, a separate workshop would also be appropriate, (or any separated part of a workshop) which is duly prepared for accepting the degreasing operation (tile covered with water discharge). In all cases, a confluent collector of water discharge as well as a collecting shaft normally divided into two parts are created under the ground of the working area for the selective collection of water with washing medium and for the water used for flushing. There is an exhaust hood in place above the place of work therefore the vaporous air is discharged to the open air by means of an exhaust fan.
Degreasing- phosphate coating
Degreasing – phosphate coating is carried out with a steam beam device. The chemical water sprayed by the steam shave device, flowing away from the work piece is collected in the collecting shaft in place. The liquid is pumped back from the shaft to the tank by a pump (according to the given conditions), whereas the chemical concentration can be adjusted. The design of the collecting tank is such that it allows the up flown oil layer to be decanted by increasing the level of the fluid. The washing liquid gets to the steam shave device by means of gravity overflow, whereas it is used again. Therefore, the pre-treatment is managed in a closed system, where the washing fluid is constantly circulated. This technology allows water saving operation of the equipment. For the heating of the washing fluid, electric heater inlets or low power gas furnace is applied according to the customer’s request.
Flushing is done in a method just similar to that of degreasing-phosphate coating. The flushing liquid is also applied by a stem shave device. The flushing equipment also has a tank 1m3 which is not heated. Shifting between the spraying operations may be managed manually or in a semi-automatic operation. In case of manual application, the shifting will be conducted by the operator by opening and closing the relevant taps. The manual system is work-consuming however; it allows a cheaper conduct of the work.
In case of a semi-automatic system in place, the shifting can be controlled by press buttons and magnetic valves. By shifting the flushing operation, a motor-driven by-pass valve discharges the sprayed liquid to the shaft designed for the flushing device (and the motor-driven by-pass valve of the degreasing unit closes).
Following the flushing from the tank, fresh water flush is recommended which can be done from the water supply network by shifting the valves accordingly. The fresh water flush may be completed by desalted water flush as well, in the case of which an RO unit is built in the circuit, where the amount of fresh water can be controlled and adjusted by a magnetic valve. Spraying the “dion” water is also carried out with the steam shave unit. The sprayed fresh or desalted water is discharged to the shaft of the flushing device and, by means of the shaft pump, is forwarded to the flushing tank. This provides the continuous fresh water supply of the system.
The design of the collecting shafts shall be done by the customer, for which we always provide the appropriate data concerned.
The generated waste water, depending on the amounts, may:
- be shipped and disposed
- treated in a smaller waste water treatment plant and discharged to a canal
- Since the steam shave system is usually applied to small volumes of work pieces, the most economical solution is the disposal of the treated waste water.
A steam shave type of pre-treatment equipment may consist of the following main and auxiliary units:
- 1 m3- heated degreasing tank
- 1 m3- flush water tank
- high pressure washing equipment
- electric heating inlets, or fittings of gas furnace
- pipelines, pipe assemblies
- exhaust hood with fan and control device
- discharge air technology
- grated floor
- complete cabinet assembly in case of a closed system
- diving pump
- electric control, control panels, press buttons, control cabinet