EVALUATION OF A REDUCED PRESSURE BACKFLOW PREVENTER USING ACTIVATION ANALYSIS

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Description

Despite its advantages of economy and convenience, the reduced-pressure- principle backflow preventer was oniy partialiy accepted as a substitutr for air- gap separation in preventing pollution of potable winter. To evaluate the protection provided by a reduced pressure principle backflow preventer, a unit was tested under the following static conditions; ionic diffusion, lower pressure on the supply side than on the discharge side, vacuum on the supply side, water hammer on the supply side, and water hammer on the discharge side. Using a solution of Mn and K nitrates as a nonradioactive tracer, backflow from the discharge side to the ... continued below

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Pages: 51

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Baird, J.N. Jr.; Sanford, W.R. & Cristy, G.A. January 1, 1963.

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Description

Despite its advantages of economy and convenience, the reduced-pressure- principle backflow preventer was oniy partialiy accepted as a substitutr for air- gap separation in preventing pollution of potable winter. To evaluate the protection provided by a reduced pressure principle backflow preventer, a unit was tested under the following static conditions; ionic diffusion, lower pressure on the supply side than on the discharge side, vacuum on the supply side, water hammer on the supply side, and water hammer on the discharge side. Using a solution of Mn and K nitrates as a nonradioactive tracer, backflow from the discharge side to the supply side was not detectable by activation and radiochemical analyses having a sensitivity of approximates 0.2 ppb Mn. The protection factor for the device is defined as: P. F. = (Reagent concentration in the discharge zone/ Reagent concentration in the supply zone due to backflow). The minimum protection factor proved in these tests based upon the limit of the sensitivity of Mn analysis is 6.5 x 10/sup 8/. This factor provides a rational basis for inatallation where the concentration of radioactivity or other contaminant can be estimated, measured, or limited. The K analyses also showed no detection of backflow but with a lesser sensitivity. (auth)

Physical Description

Pages: 51

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: ORNL-3380
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4710469 | External Link
  • Office of Scientific & Technical Information Report Number: 4710469
  • Archival Resource Key: ark:/67531/metadc1027436

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1963

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Oct. 23, 2017, 12:53 p.m.

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Baird, J.N. Jr.; Sanford, W.R. & Cristy, G.A. EVALUATION OF A REDUCED PRESSURE BACKFLOW PREVENTER USING ACTIVATION ANALYSIS, report, January 1, 1963; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1027436/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.