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Title: Construction Practices For Corrosion Control
Author: B. m. Dearing
Source: American Gas Association 1991
Year Published: 1991
Abstract: Corrosion of metals is a natural phenomenon which returns the metal to its native or ore state from whence it came. Man has found many uses for metals since the Bronze Age, one of these is fabrication into pipe for transporting methane gas as a source of energy. At one time, it was thought that pipe required periodic replacement as a normal part of business. In the early 1900s pipe was coated with pitch, asphalt, wax, et cetera to prolong the life. The first step of corrosion control therefore is coating the pipe with a dielectric material. Each corrosion control coating must contain the following properties: Be applied on a properly prepared surface Have sufficient adhesion to the metal surface to effectively resist migration of moisture Be sufficiently ductile to resist cracking Have sufficient strength to resist damage due to handhng and soil stress Have properties compatible with any supplemental cathodic protection Have low moisture absorption and high electrical resistance to be an electrically insulating coating Must be inspected just prior to lowering into the ditch and any damage detrimental to effective corrosion control must be repaired Must be protected from damage resulting from adverse ditch conditions and When installed by boring, driving or other similar method, precautions must be taken to minimize damage to the coating during installation.

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