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51312-01297-Wrinkling of Heat Shrinkable Sleeves / Tapes in Buried Pipelines

Picture for Wrinkling of Heat Shrinkable Sleeves / Tapes in Buried Pipelines
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Product Number: 51312-01297-SG
ISBN: 01297 2012 CP
Author: King Him Lo
Publication Date: 2012
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$20.00
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Heat shrinkable sleeves are used to coat field joints and tapes for repairing damaged coating in pipelines. These field applied coating systems usually consist of (at least) two different material layers – an outer polyolefin backing and an inner adhesive layer. The adhesive layer is normally softer than the polyolefin backing especially at higher temperatures. The relatively soft adhesive layer serves to facilitate their field application. For some buried pipelines wrinkling of the polyolefin backing in the field joints have been observed after some time in service. Wrinkling of the polyolefin backing allows the adhesive to flow out; enables soil and water to trap underneath the backing; and subsequently causing corrosion of the steel substrate. The purpose of this paper is to present simple models to describe the wrinkling behavior of the polyolefin backing and to relate the wrinkling phenomenon to the mechanical properties and thicknesses of the polyolefin backing and adhesive layers. Simple design formulae are developed which could be used to guide heat shrinkable sleeve and tape manufacturers to design and develop appropriate products and could also be used to assist the end users to select the proper products for their specific applications. Key Words: Heat shrinkable sleeve tape wrinkling design formulae
Heat shrinkable sleeves are used to coat field joints and tapes for repairing damaged coating in pipelines. These field applied coating systems usually consist of (at least) two different material layers – an outer polyolefin backing and an inner adhesive layer. The adhesive layer is normally softer than the polyolefin backing especially at higher temperatures. The relatively soft adhesive layer serves to facilitate their field application. For some buried pipelines wrinkling of the polyolefin backing in the field joints have been observed after some time in service. Wrinkling of the polyolefin backing allows the adhesive to flow out; enables soil and water to trap underneath the backing; and subsequently causing corrosion of the steel substrate. The purpose of this paper is to present simple models to describe the wrinkling behavior of the polyolefin backing and to relate the wrinkling phenomenon to the mechanical properties and thicknesses of the polyolefin backing and adhesive layers. Simple design formulae are developed which could be used to guide heat shrinkable sleeve and tape manufacturers to design and develop appropriate products and could also be used to assist the end users to select the proper products for their specific applications. Key Words: Heat shrinkable sleeve tape wrinkling design formulae
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