Recommended Practice for Backflow prevention and Cross-Connection Control (M14) / Edition 2

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Overview

Cross-connection control is one of the most important barriers in the multiple-barrier approach drinking water suppliers use to protect public health. Contamination of a drinking water distribution system through a cross-connection often results in immediate adverse health effects - illness or even death. This Manual provides a total cross-connection control program for your water system. The manual explains how cross-connections and backflow can occur and tells you how to choose, install, and maintain backflow prevention devices. You’ll learn the water purveyor’s legal responsibilities, as well as the customer’s responsibilities in backflow prevention. The manual covers risk assessment, types of programs to consider, and program administration. Until the cross connection control program is fully developed, the water purveyor is at maximum risk of potential liability.

This Manual also explains the hydraulics of backflow, the two types of backflow – backsiphonage and backpressure, and the conditions that can cause backflow and a potential cross-connection (such as a water main break).

You’ll get expert guidance in selecting and installing backflow prevention equipment andl learn the 10 main types of backflow prevention devices or assemblies (yes, they are different), and the relative effectiveness of each type against backsiphonage, backpressure, and low and high hazards. The manual describes each device or assembly, its application in a water system, installation requirements. Detailed assembly test procedures are included for the different types of devices and assemblies.

This Manual recommends backflow prevention equipment for installation in the water distribution system, as well as raw water-storage reservoirs, chemical feed pumps and injectors, filters, surface washers, saturators and dry chemical solution tanks, sampling lines, hose bib connections, and membrane systems.

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Editorial Reviews

Booknews
The conditions which allow backflow can be subtle and variable; the consequences of pollution in the potable water system can be devastating. This manual is a guide toward uniformity for waterworks employees, plumbers, and others involved in the detection and elimination of unprotected cross connections, setting forth criteria for the selection and installation of assemblies and outlining general state-of-the-art procedures and techniques for inspection and maintenance. For ease of processing, use the catalog number when ordering: 30014 DJ. Annotation c. Book News, Inc., Portland, OR (booknews.com)
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Product Details

  • ISBN-13: 9781583212882
  • Publisher: American Water Works Association
  • Publication date: 11/28/2005
  • Series: AWWA Manual Series
  • Edition number: 2
  • Pages: 148
  • Product dimensions: 8.25 (w) x 11.00 (h) x 0.32 (d)

Meet the Author


Established in 1881, the American Water Works Association is the oldest and largest nonprofit, scientific and educational association dedicated to safe and sustainable water in the world. With more than 50,000 members worldwide and 43 Sections in North America, AWWA advances public health, safety and welfare by uniting the efforts of the entire water community.
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Table of Contents

Ch. 1 Introduction 1
Ch. 2 Program administration 11
Ch. 3 Backflow principles 29
Ch. 4 Backflow-prevention assembly application, installation, and maintenance 41
Ch. 5 Typical hazards 63
App. A Assembly test procedures 85
App. B Model ordinance 109
App. C Common symbols 117
App. D AWWA policy statement on cross-connections 119
App. E Abbreviations of agencies and organizations 121
App. F Web sites for backflow-prevention incidents 123
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