Surface, vacuum, cleaning removable

The filter unit was located entirely inside the respective buildings and was independent of the ventilation system. The unit consisted of a suction box (usually floor standing) to which the filter material was attached usually as a flat vertical surface of an area to give a face velocity of about 0.75 m/s. Dust collected on this surface and was removed with a vacuum cleaner. Cleaned air was directed into an overhead discharge duct with a permeable lower surface. The capacity of the fan in the filter unit was made the same order as that of the main ventilating fan. The overhead duct was located above and as near to the stock as possible so that the clean air flowed downwards towards the stock. This air did not cause a draught because it was discharged at a low speed (0.3 m/s) and as it was recirculated it was at the same temperature as the air in the room. 

SPILL CLEAN-UP Dry sand or earth should be spread on the leak, or spill area bulk liquid may also be absorbed with fly ash or cement powder cleanup of areas contaminated wit soot should involve dry vacuuming of surfaces with a vacuum cleaning system equipped with a high efficiency particulate (HEPA) filter after preliminary cleanup, wash surfaces with alkaline of nonionic synthetic detergents in water clean nonporous electrical and mechanical equipment with organic solvents remove all sources of ignition. 

Dust emission caused by vehicle movement should be controlled by good housekeeping practices. For example, spillages on the top of tankers should be removed at the loading point, preferably using vacuum cleaning, and roadways should be hard-surfaced and kept clean. 

In belt discharge drum filters (Figure 58.14b), the medium is passed on an endless belt over the drum for filtering and then over a small roller to dislodge the cake. The medium may be cleaned as it returns. With roller discharge (Figure 58.14c), a roller is rotated close to the surface of the drum. The filter cake passes to the roller near the discharge point where the vacuum is removed from the compartment, and then scraped off. 

There are many reasons for surface treatment of the fibers. In one process,introduction of functional groups is described. The equipment designed for this process includes a cleaning vessel, a vacuum drier, and a plasma treatment vessel. The fiber is first treated with a solvent, which is subsequently removed in the vacuum drier to remove all residual solvent. The surface is then modified by a plasma treatment. Cleaning removes dirt from the natural fibers and impurities from man-made fibers. Water, hydrocarbons, and halogenated hydrocarbons are used in an enclosed system. Surface etching and cleaning techniques which were used in the past released solvents and other materials to environment, especially because the fibers were not sufficiently dried. 

All dust and spent abrasive must be removed from the surface by vacuum cleaning or brushing. After blasting all workers coming into contact with the clean surface should wear clean, protective gloves and clothing to prevent contamination of the cleaned surface. Any contamination may cause premature fail-... 

Of the three methods to produce a roughened surface, the most technically effective is abrasive blasting by means of sandblasting or shot blasting followed by broom sweeping, vacuum cleaning, or an air blast to remove the abrasive. However, in some instances this may not be a practical approach. 

A clean driUing room decreases repair costs and the possibility of improper operation of the drilling machines. Wipe surfaces clean using a lint-free cloth or use a vacuum to remove debris. 

Vacuum cleaning Dry surfaces Removes contaminated dust by suction Use conventional vacuum technique with efficient filter Good on dry, porous surfaces. Avoids water reactions All dust must be filtered out of exhaust. Machine is contaminated... 

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