Clean cover barrier methods

A wide range of technologies are available for the remediation of contaminated sites, and the applicability of a particular method depends on the site conditions, the type and extent of contamination, and the extent of remediation required. In some situations, it may be possible to rely on natural decay or dispersion of the contaminants. Removal of contaminants from a site for disposal in an approved disposal facility has frequently been used. However, the costs involved in removal can be extremely high. On-site burial can be carried out by the provision of an acceptable surface barrier or an approved depth of clean surface filling over the contaminated material. This may require considerable earthwork. Clean covers are most appropriate for sites... 

Exact experimental methods. Surface-pressure measurements. Nearly all the methods in use at present are modifications of Langmuir s method, of directly measuring the outward force exerted on a light floating barrier which divides the film-covered surface from a clean surface and for the manipulation of the films, and adjustment of the area available for them, modifications of Pockels s barriers are almost always used. Ths essential points requiring attention for accuracy are as follows ... 

Sand blasting has been used to clean drill pipe and remove barriers and scale from the metal. Control methods most often used on operating equipment include frequent treatments with oil-soluble, organic amine inhibitors apphed directly to the affected metal surface. These must penetrate and cover either the anodic or the cathodic area (or both) of the corrosion cell in order to stifle the cell. 

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