. Journal of the New England Water Works Association . cation of justifiable use — in the country only, or also forprimary feeders in the distribution system of the city? (2) And in the country, does the saving in cost of acquiring privateright-of-way justify the laying of pipe in a convenient highway, with itsattendant later troubles in repair? (3) What of water hammer? Very definite policies are laid down forcast-iron pipe on this point. (4) For what condition should air valves be proportioned? (5) The theoretical analysis of a pipe to withstand internal waterpressure is simple, and safe dep
. Journal of the New England Water Works Association . cation of justifiable use — in the country only, or also forprimary feeders in the distribution system of the city? (2) And in the country, does the saving in cost of acquiring privateright-of-way justify the laying of pipe in a convenient highway, with itsattendant later troubles in repair? (3) What of water hammer? Very definite policies are laid down forcast-iron pipe on this point. (4) For what condition should air valves be proportioned? (5) The theoretical analysis of a pipe to withstand internal waterpressure is simple, and safe depths of cover for given diameters of pipe and DIXON. 1G9 thickness of plate have been worked out. But in various places w<steel pipe used at a minimum plate thickness of \ inch, selected purely onthe basis of general judgment. Do the uncertainties justify the aarrowingof limits of plate thickness down to conform somewhat with the variousclasses of cast-iron pipe? (6) Should a steel pipeline be rigidly anchored, or should it be kitfree to breathe?. 170 INVESTIGATION OF ELECTROLY>l-. INVESTIGATION OF ELECTROLYSIS ON STEEL FORCE MAIN AT AKRON, OHIO. BY VICTOR B. PHILLIPS.* [Read March 14, 1933.] • Introduction. In his paper before this meeting, Mr. G. Gale Dixon has outlined in ageneral way the history of the Akron Steel Force Main and the conditionswhich finally led to the retention of the firm of Crecelius & Phillips for thepurpose of investigating the electrolytic conditions. The map on page 169shows the 36-inch steel force main leading from the Earlville PumpingStation to the reservoir in the city of Akron, a distance of about eleven milesand the location of the electric railway tracks, substations, gas mains, steamrailroad tracks, and the principal city water main connections to the forcemain. Rather serious corrosion of the main had been discovered imme-diately west of the town of Tallmadge and at no other place. It will benoted that this point is more than three mi
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