. Engineering and Contracting . Now suppose instead of being ableto get 65 per cent submergence, we can get only 40 per centsubmergence. In order to deliver 150 gal. per minute underthese conditions, a 4%-in. pump should be used and one couldexpect 1 gal. of water for every cu. ft. of air at 25 lb. pres-sure. By a little figuring the engineer can ascertain that it re-quired more horse power to raise the water In the secondinstance than it did in the first. As can be noted from this example, as the submergence de-creases, the size of the discharge line should increase. Butthis is only
. Engineering and Contracting . Now suppose instead of being ableto get 65 per cent submergence, we can get only 40 per centsubmergence. In order to deliver 150 gal. per minute underthese conditions, a 4%-in. pump should be used and one couldexpect 1 gal. of water for every cu. ft. of air at 25 lb. pres-sure. By a little figuring the engineer can ascertain that it re-quired more horse power to raise the water In the secondinstance than it did in the first. As can be noted from this example, as the submergence de-creases, the size of the discharge line should increase. Butthis is only a general rule and the conditions in the well tohe pumped wholly govern the change to be made. Outfall Sewer of Creosoted Wood StavePipe A 60-in. creosoted wood stave outfall sewer has been com-pleted recently for the city of Seattle, Wash. The section is1,760 ft. in length and connects with a 78-in. concrete sewerin Rainier Ave. The staves in the pipe are 2% in. in thick-ness and made of selected fir. They are bound with bands. 60-in. Creosotea wood stave Outfall Sewer. 1/2 in. in diameter. There are two separate pieces to eachband, the ends being connected by means of malleable ironshoes which are spaced 6 in. apart. The lumber was creo-soted by the pressure and vacuum process. By this methodcreosote was forced into the wood through pressure and afterthoroughly saturating was extracted through vacuum, thewood retaining 8 lb. of creosote to the cubic foot. Thiswood stave pipe sewer was installed by the Continental PipeMfg. Co., of Seattle, under a subcontract from the PugetSound Bridge & Dredge Co., the general contractors forthe Rainier Ave. sewer work. Results of National Irrigation An interesting summaiy of tlie work accomplished by theU. S. Reclamation Service since its organization was givenby Mr. Arthur P. Davis, Director and Chief Engineer in theDecember Reclamation Record, from which the note^ fol-lowing are taken: Since 1902 the Reclamation Service has constructed the
Size: 1949px × 1283px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
