Article | June 12, 2020

Innovative And Dependable Protection For Your Pipeline Assets In The Most Demanding Environments

By Maury D. Gaston

American
Pipe after exhumation from the Everglades and analysis. The square shows the location of a 0.25 inch round hole in the wrap; the horizontal lines, ends of a 3.0 inch slit in the wrap; the triangle, a 1.0 inch equilateral triangle hole in the wrap. The circle marks the location of zinc coating damaged by grinding to bare metal before wrapping an area 0.5 inch x 2.0 inch.

The Ductile Iron Pipe Research Association and the Corrpro corrosion consulting firm conducted a joint study of zinc coated and V-Bio enhanced polyethylene encased ductile iron pipe buried in the Everglades.  I presented the results at NACE’s Eastern Area Conference in Jacksonville, Florida in October of 2019, and a separate report will be part of the NACE 2020 conference digital proceedings later this summer.

The history of zinc on ductile iron pipe in Europe and now in the United States is reviewed.  The application of zinc to ductile iron pipe with a metalized arc-spray process is included.  How zinc coating galvanically protects iron pipe and how a finishing layer top coat complements the zinc is outlined. 

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