Process for protecting concrete sewer pipes

Details Process for protecting concrete sewer pipes Process for protecting concrete sewer pipes

1995-06-07

1997-11-04

Beck, Shrive

Coating processes

Interior of hollow article coating

Spraying

427230, 427421, 118DIG10, 118306, 118317, B05D 722

Patent

active

056837488

ABSTRACT:
A process for inhibiting acidic corrosion in the crown of a concrete sewer pipeline of the type created by the generation of sulfuric acid within the pipeline and a lowering of the pH at the surface of the concrete. The process comprises the forming of a slurry of magnesium hydroxide, preferably precipitated from seawater, and water wherein the magnesium hydroxide comprises at least about 25-50% of the slurry by weight, and spraying the slurry onto and along the crown of the concrete pipeline to provide a slurry coating on the crown of the pipeline of about 0.2 inches in thickness so as to provide a relatively long lasting barrier of high pH and thereby prevent acidic corrosion of the pipeline.

REFERENCES:
patent: 4456635 (1984-06-01), Albanese et al.
patent: 4786525 (1988-11-01), Kayser et al.
patent: 5246641 (1993-09-01), Perkins et al.
patent: 5514357 (1996-05-01), Richmond et al.

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