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At the request of the water department of Wichita Falls, Texas, and with the co6peration of the Cast Iron Pipe Research Association, K. H. Logan, chief of the Bureau's underground corrosion section, is making a special survey of corrosion experienced in the vicinity of that city. The shortage of iron and steel has accentuated the need for reducing corrosion of pipe lines as much as possible. The most promising method at present seems to be the imposition of negative electrical potentials on a line which is to be protected. There are two ways of doing this, one by drawing energy from a regular power line, the other by connecting to the pipe line zinc slabs buried at intervals in the earth. The first method is in widespread use in Texas, and a very extensive installation of zinc anodes has been in use in southern Colorado for a number of years. The Petroleum Industry Electrical Association and a number of pipe-line organizations have asked for co6peration in determining the effectiveness of these two methods in the field and Mr. Logan will also consider this aspect of the problem.
π SIMILAR VOLUMES
To be able to give safe recommendations concerning the choice of suitable stainless steel grades for pipelines to be buried in various soil environments, a large research programme, including field exposures of test specimens buried in soil in Sweden and in France, has been performed. Resistance aga