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1068 CHAPTER 42 1957 Guide of the American Water Works Association has accepted these values as standard for all public water supplies in the United States.44 While their action is not binding, prudence dictates that no form of treatment should be used that will result in raising the concentration of the substances listed above the value cited. Since virtually all of the permissible chemicals used for scale, slime, and corrosion control have deleterious, physiological effects if taken internally m relatively large doses, they should always be carefully- proportioned. To insure this, the Detroit ordinance stipulates that the chemical feeding device must have the following major characteristics: "1. There shall be a visible means of checking the quantity of material being applied by the feeding device.- 2. A water metering device, sealed to prevent tampering, shall be installed to measure the flow of water being treated. 3. The device shall be constructed so that in the event of back-flow or vacuums, the maximum amount of material that may be possibly back-siphoned from the device or any of its attachments or parts shall not exceed one fluid ounce. 4. Should there be a failure of the water metering device or the water supply, the feeding device shall automatically cease operating." REFERENCES I Annual Report (1947) Committee D-19 (American Society for Testing Materials) 8 Corrosion Handbook, edited by.H. H. Uhlig (John Wiley & Sons, p. 27). * Discussion, Corrosion and Material Protection, May 1945, p. 2. 4 Round-Table Discussion on Organizing the Classification of Industrial Waters, by W. C. Schroeder (Proceedings, American Society for Testing Materials, Vol. 44, 1944, p. 1057). 6 Typical Water Analyses for Classification with Reference to Industrial Use, by W. D. Collins (Proceedings, American Society for Testing Materials, Vol. 44.1944, p. 1057). . A.S.T.M. Standard D-596r-41 (.American Society for Testing Materials). 7 Discussion on Preventing Solution of CO! in Condensates, by E. W. Guernsey (A.S.H.V.E. Transactions, Vol. 51, 1945, p. 69). . 8 Studies of the Mechanism of Solution, of C02 in Condensates Formed in Steam Heating Systems of Buildings, by L. F. Collins (A.S.H.V.E. Transactions, Vol. 51, 1945, p. 39). * The Analytical Control of Anti-Corrosion Water Treatment, by W. F. Langelier (Journal, American Water Works Association, Vol. 28, 1936, p. 1500). 10 Surface-Active Properties of Hexametaphosphate, by G. B. Hatch and Owen Rice (Industrial and Engieering Chemistry, Vol. 31, 1939, p. 51). II Threshold Treatment of Water Systems, by G. B. Hatch and Owen Rice (Indus trial and Engineering Chemistry, Vol. 37, 1954, p. 710). 18 Betz Handbook of Industrial Water Conditioning, Fourth Edition (W. H. & L. D. Betz Co.). 18 Cooling Water Problems in the New York Metropolitan Area, by Sidney Sussman (Industrial and Engineering Chemistry, Vol. 44, Aug. 1952, p. 1740). 14 Slime Control in Cooling Equipment with Phenol Derivatives, by J. A. Holmes (Proceedings, Annual Water Conference, Engineers' Society of Western Pennsylvania, 1944, p. 61). Corrosion and Water Formed Deposits,' Causes and Prevention 1069 18 Tuberculation of Mains as Affected by Bacteria, by H. G. Reddick and S. E. Linderman (Journal, New England Water Works Association, Vol. 46, 1932, No. 42). 18 Microbiological Anaerobic Corrosion of Steel Pipe Lines, by R. F. Hadley (The Oil and Gas Journal, September, 1939). 17 Cold Water Vacuum Deaeration, by S. T. Powell (Proceedings, Water Con ference, Engineers' Society of Western Pennsylvania, 1945, p. 51). 18 Corrosion Control with Threshold Treatment, by G. B. Hatch and Owen Rice (Industrial and Engineering Chemistry, Vol. 32, 1940, pi 1572). 17 Tests of Corrosion Inhibitors for Water Treatment in Air Conditioning Equip ment, by James H. Wilson and E. C. Groesback (Research Paper 1305, National Bur eau of Standards Journal of Research, Vol. 24, 1940, p. 665). 80 The Control of Corrosion in Air-Conditioning Equipment by Chemical Methods, by C. M. Sterne (Proceedings, American Society for Testing Materials, Vol. 38,1935, Part 2, p. 261). 71 Corrosion in Closed Recirculating Water Systems, by Sidney Sussman and James B. Fullman (Heating and Ventilating, October 1953, p. 77). 88 Corrosion--Causes and Prevention, by F. N. Speller (McGraw-Hill Book Co., 1951, pp. 805, 905, 910 and 912). 83 Engineering Problems of Water Treatment, by L. F. Collins (Power Plant En gineering, Vol. 50, July 1946, p. 78-81, 120). 84 See p. 470 of Reference 19. 85 Studies in The Detroit Edison Co. (Unpublished). 88 Preventing the Solution of COi in Condensates by Venting of the Vapor Space of Steam Heating Equipment, by D. S. McKinney, J. J. McGovern, C. W. Young and L. F. Collins (A.S.H.V.E. Transactions, Vol. 51, 1945, p. 53). 87 Corrosion in Steam Heating Systems, by Leo F. Collins and Everette L. Hender son (Heating, Piping and Air Conditioning, October 1939, p. 620). 88 U. S. Patent 1,395,730. 88 U. S. Patent 2,053,024. 80 U. S. Patent 1,903,287. 31 Treating Steam Chemically to Reduce Return Line Corrosion, by A. A. Berk (Industry and Power, Vol. 53, Nov. 1947, p. 79). 38 Tests in The Detroit Edison Co. (Unpublished). 33 Rubber Linings and Coatings, by J. J. McNeil (Corrosion and Material Protec tion, March-April, 1947). 34 Protection of Steel Bins from Corrosion, by J. V. Schaefer (Power Plant En gineering, Vol. 26, 1922, p. 632). 38 Some Notes on Corrosion of Cast-Iron Sectional Boilers, by E. R. Walters (The Institution of Healing and Ventilating Engineers, Preprint, 1944). 38 See p. 67 of Reference 2. 37 Soil Corrosion Studies, 1941, by K. H. Logan and M. Romanoff (National Bureau f Standards Journal of Research, Vol. 33, 1944, p. 145). 33 Cathodic Protection of Steel Equipment Submerged in Water, by L. P. Sudrabin (Proceedings, Water Conference, Engineers' Society of Western Pennsylvania, 1944).