Download External Corrosion - Introduction to Chemistry and Control by American Water Works Association PDF

By American Water Works Association

Corrosion prevention and keep an eye on is a pragmatic technological know-how that enables rather trustworthy predictions of corrosive stipulations and, extra importantly, powerful prevention or mitigation of corrosion the place economically applicable. This guide supplies the pro water application operator an realizing of the way and why corrosion happens, how the corrosion power of an atmosphere is evaluated, and the way a number of the confirmed corrosion prevention and keep watch over measures function.

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Additional resources for External Corrosion - Introduction to Chemistry and Control

Sample text

The structure becomes the cathode and is protected. Details of a typical sacrificial anode installation are illustrated in Figure 4-2. Copyright (C) 2004 American Water Works Association All Rights Reserved CORROSION PROTECTION OF BURIED PIPELINES 45 Exothermic Weld Insulated Epoxy Putty or Mastic Figure 4-2 Details of a sacrificial anode installation Sacrificial anode protection may be used selectively in “hot spot” areas that have been located by soil survey procedures. This requires that rubber-gasketed joints be electrically bonded throughout the protected area.

AWWA Manual M23, PVC Pipe-Design and Installation. American Water Works Association: Denver, CO. Copyright (C) 2004 American Water Works Association All Rights Reserved AWWA MANUAL Chapter 4 Corrosion Protection of Buried Pipelines Where tests and observations indicate that corrosion will be a problem in a new or existing installation, steps must be taken to reduce the severity of the corrosion or eliminate it entirely. A variety of methods and combinations of methods are available for corrosion control.

The reference cell has a stable, constant potential against which the voltage of another metal can be measured, analogous to measuring elevation with reference to sea level. When the potential between a pipe and reference electrode in contact with the earth is measured, the potential includes not only the voltage between the pipe and reference cell but also IR-drop voltages created by currents flowing through the resistance of the earth. This measurement is the most useful test in evaluating stray-current effects and cathodic protection effectiveness.

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