摘要:

This column provides news briefs and vignettes of the water industry as of June 1961.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00706.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

In this joint discussion, Lee B. Hertzberg states that water utilities have been “drafted” by the electric industry to provide, through water piping systems, a part of the electric utility system consisting of the ground connections to water pipe. The article provides a brief overview of the three original assumptions used by the electric utilities to justify such usage, along with a review of AWWA policy on electrical grounding, and a discussion of the findings of the American Research Committee on Grounding, the International Association of Electrical Inspectors's (IAEI's) special committee on grounding, and many other committees and individuals who investigated the grounding problem all prove conclusively that the three original assumptions used as a basis for grounding electric equipment to water service piping are now largely false. The article discusses how changing technology, and the use of nonmetallic materials by the water utilities has made water systems useless for electric‐grounding purposes. In the second part of this joint discussion, Arthur G. Clark of the Los Angeles Department of Building and Safety, provides a brief overview of what constitutes effective electric‐grounding. Clark disagrees with AWWA policy on grounding, but presents a good statement of the electrical inspection authority's viewpoint on the matter.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00704.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article presents a series of papers presented on Aug. 29, 1960, at the Symposium on Water Quality Measurement and Instrumentation, Cincinnati, Ohio, including the following: “Utility Needs,” by Samuel S. Baxter, discusses a utility's need for adequate data on fluctuations in raw supply, functioning of treatment and distribution equipment, and finished product quality; “Consulting Engineer Needs,” by Paul D. Haney, discusses the consulting engineer's need for water quality data; “Industry Needs,” by Milton F. Schaible, discusses industry's need for sustained collection of basic water data; “Federal Needs,” by K.S. Krause, discusses the use of water quality data by federal government agencies for the purposes of development of supplies, utilization of water resources, monitoring for conformance to standards, quality control, and depicting trends in water quality; “Significance of Radioactivity Data,” by Conrad P. Straub, discusses radioactivity measurement in U.S. surface water samples; and, “Instrumentation for Continuous Analysis,” by Robert H. Jones and Robert J. Joyce, discusses the principles involved in currently available water analysis instrumentation.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00707.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article begins by providing a brief overview of coatings for inside surfaces of steel water storage tanks, including various inside coating materials that have been extensively used. Topics covered include: toxicity; red‐lead phenolic paint; tar and asphalt coatings; wax coatings; newer coatings; vinyl paints; epoxy resins; outside coatings; colored paints; surface preparation; pickling and blast cleaning; cleaning and painting costs; and, maintenance and inspections.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00708.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article discusses the results of electrophoretic studies of the particles of calcium carbonate and magnesium hydroxide produced in lime‐soda softening, along with the effects produced by the addition of small dosages of each of four coagulant aids. The primary objective of this study was to obtain information on the zeta potentials of the colloidal particles of calcium carbonate and magnesium hydroxide throughout the entire pH range of lime‐soda softening, in order that the basic mechanisms of their coagulation may be more fully understood. Because of widespread interest in the application of polyelectrolyte coagulant aids in water softening, a secondary objective of the research was to study the effects of several coagulant aids on the mobility and coagulation of the particles composing softening sludges.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00709.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This short summary presents a study at the Lawrence (Massachusetts) Experiment Station on nematodes found in the Merrimack River. Trends that were detected included: a larger proportion of raw samples contained nematodes during the summer months; and, during these months there was a larger number of samples with more than one nematode per gallon. In all instances, no nematodes could be found in the finished water.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00710.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This short comment suggests that materials recovered from carbon by chloroform with the techniques described in the literature simply be referred to as “carbon chloroform extract,” which would be abbreviated “CCE.” The alcohol extract would be called “carbon alcohol extract” (CAE). The sampling technique could be aptly described as the “carbon adsorption method” (CAM).

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00711.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article presents Chapter 4, Manufacture and Test, of the AWWA Committee Report on the Design and Installation of Steel Water Pipe. The chapter discusses welding processes, seamless processes, testing and inspection, tests of chemical properties, tests of physical properties, tests of dimensional properties, and good practice.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00712.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article presents Chapter 5, Hydraulics of Pipelines, of the AWWA Committee Report on the Design and Installation of Steel Water Pipe. The chapter discusses general considerations, conventional flow formulas, universal flow formulas, computations for flow through pipe, flow through fittings, economical diameter of pipe, standard sizes, inlets and transitions, air entrainment and release, and good practice.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00713.x

出版商:Wiley    

年代:1961

数据来源: WILEY

摘要:

This article presents Chapter 6, Determination of Pipe Wall Thickness, of the AWWA Committee Report on the Design and Installation of Steel Water Pipe. The chapter discusses internal pressure, working tension stress in steel, mill tolerance, corrosion allowance, external pressure ‐ uniform, practical requirements, and good practice.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1961.tb00714.x

出版商:Wiley    

年代:1961

数据来源: WILEY