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Inspection Trip & Conclusion <br />A trip was made to "St' kne &.Hanover" Plants in Chicago <br />by Mr. Louis Rague, Mr. Casimir Bp,and the writer. Though <br />not yet operating at Chicago, the aero -guns by Carter were visually <br />inspected as to construction and principle including compressors and <br />components. <br />The Pearth System, in operation in Chicago have caused <br />considerable trouble in operation. The main trouble being high froth - <br />ing which has forced sludge out and up around the floating covers. <br />This problem in winter with freezing conditions has been quite serious. <br />To minimize the problem,.the 15' lances were cut to 51. This did not <br />cure the problem, but did reduce it. Now this system can only dis- <br />turb the top surface of the digester and does not perform the service <br />for which it was intended. The apparent cause of this frothing ap- <br />pears to be pumping such high volumes of gas through the sludge media <br />and stripping therefrom foaming elements. We recommend against the <br />Pearth System, which in our opinion has a far greater hazard in opera- <br />7E lacks in reliability, and has a high operational cost. <br />CLYDE E. WILLIAMS & ASSOCIATES, INC. <br />Bernard E. Brennan <br />