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April 20 - April 27, 2017

How does one apply thin polymer coatings to installed tubes or pipes with diameters of one to three inches and lengths of 20 to 60 feet?

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Selected Answers

From Donald Wroble of Raven Lining Systems on April 24, 2017:
There is technology that you are suggesting in the USA.One-half inch to 24-inch  pipes have been lined in place with blow- through application technology for over 20 years. A specially formulated epoxy product is blown into any metallic pipe after it is abrasive-blasted in place. It has NSF 61 approvals for potable water but can be used for most applications and has a 40- to 60-year life cycle design.

From Alfredo Claussen of Instituto Mexicano del Petroleo on April 21, 2017:
There is a 1989 US patent, number 4,798,474 "In-Situ Pipeline coating" that describes a method for applying an internal coating (of the epoxy resin type) to the inside of a long (60 miles) pipeline, that proposes the use of two spherical "pigs" that trap about one cubic meter of liquid coating between them, and then are sent along the pipeline to coat the inside. A similar but miniaturized approach could be easily devised to apply a coating to smaller pipes by wiping (extruding) the inside with the coating material.

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Tagged categories: Paint application; Pipeline; Polymers

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