Washstands versus low-pressure hot cleaning technology
Brush washstands are often used in the industry when the cleaning in the repair/maintenance or the cleaning of smaller quantities is concerned. The principle is mostly similar – these are stationary devices; the used medium is cold or approx. 40°C warm and is applied in high concentration either as solvent or alkaline cleaning agent. The cleaning is effected with a brush. When looking at the Sinner’s circle the chemical component with this method of cleaning is very prominent!
Low-pressure hot cleaning devices work in contrast to this far more with the physical component temperature. In this case the handling is similar to high-pressure cleaners …. work is done with pistol or lance and the components to be cleaned are sprayed. However, the operating pressure of 3 – 8 bar is significantly lower than with high pressure, i.e. the low-pressure hot cleaning systems can be used gently in the workshop. The cleaning temperature of approx. 95°C is generated by an electrical flow heater within 1 minute and is available almost immediately. In the standby mode the technique consumes no energy, i.e. long heating-up times or a permanent electrical heating are not necessary. An alkaline or acidic cleaning agent can be added in low concentration, if required, among others to guarantee a corrosion protection. The size of the parts to be cleaned range from a „thimble“ to large heavy ”lumps”. Either the devices are equipped with a mounted-on parts cleaning bath or the systems are combined with a stationary washstand. In all cases the medium is operated in the circuit. Specific sedimentation systems assure an appropriate water treatment.
A wide range of special interchangeable tools permits the cleaning also at difficult to access places such as undercuts, blind holes, through bores, between narrow plates like filters or heat exchangers etc.
The devices are mobile and can be used, apart from the typical parts cleaning, in the repair/maintenance among others also for degreasing prior to the subsequent surface treatment or for serial parts.
A further important field of application is the cleaning of machines and installations.
Substantially the low-pressure hot cleaning devices are clearly different from the washstands:
- No or little use of aggressive chemicals and therefore protection of humans and environment
- Low consumption costs since mainly water is used.
- Mobile technique which can directly be used “on-site“. The integrated circulation systems make the operator largely self-sufficient; only a power supply is required.
- The wide range of interchangeable tools greatly extends the possible cleaning tasks. Compared with the superficial brush cleaning the task is done more quickly in most cases.
- Significantly wider range of application e.g. also for cleaning at heat exchangers, filter systems, suction systems and air conditions, machines (among others with the own cooling lubricant) and conveying systems, ceilings, walls and floors etc.