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Insights into the Consideration and Selection of Viscoelastic Materials for Potential Use in Field Patch Application

Insights into the Consideration and Selection of Viscoelastic Materials for Potential Use in Field Patch Application
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The intention of the study is to explore potential field maintenance products with service temperature ranges of 0 to 65°C for patch application, including patch repairing and to provide corrosion protection for irregularly shaped components, such as fittings and electrical connection to pipe (e.g., cadweld). Viscoelastic materials were selected as potential candidates due to their inherent features of cold-flow capability, low water permeability, easy application (by hand and directly applied to surface), and compatibility with a variety of existing pipeline coatings. 

Product Number: 51220-294-SG
Author: Haralampos Tsaprailis, Jiajun (Jeff) Liang, Shan (Sherry) Rao
Publication Date: 2020
Industry: Coatings
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$20.00

The intention of the study is to explore potential field maintenance products with service temperature ranges of 0 to 65°C for patch application, including patch repairing and to provide corrosion protection for irregularly shaped components, such as fittings and electrical connection to pipe (e.g., cadweld). Viscoelastic materials were selected as potential candidates due to their inherent features of cold-flow capability, low water permeability, easy application (by hand and directly applied to surface), and compatibility with a variety of existing pipeline coatings. Phase 1 of the study on comparative evaluation of four viscoelastic materials showed that water absorption and cathodic disbondment of the viscoelastic materials vary from product to product. This paper focuses on phase 2 of the study. All investigations were carried out on a selected viscoelastic material from the phase 1 study. The aim of this study was to further explore if the selected material could fulfill its potential by comparing performance of the material in paste/mouldable compound and tape forms and determining a proper level of surface preparation that is not only efficient, cost-effective and practical for field patch application, but also provides the long-lasting performance. Ultimately, the insights into the consideration and selection of suitable viscoelastic materials for the intended applications are presented and a new approach for a viscoelastic patch system is proposed.

The intention of the study is to explore potential field maintenance products with service temperature ranges of 0 to 65°C for patch application, including patch repairing and to provide corrosion protection for irregularly shaped components, such as fittings and electrical connection to pipe (e.g., cadweld). Viscoelastic materials were selected as potential candidates due to their inherent features of cold-flow capability, low water permeability, easy application (by hand and directly applied to surface), and compatibility with a variety of existing pipeline coatings. Phase 1 of the study on comparative evaluation of four viscoelastic materials showed that water absorption and cathodic disbondment of the viscoelastic materials vary from product to product. This paper focuses on phase 2 of the study. All investigations were carried out on a selected viscoelastic material from the phase 1 study. The aim of this study was to further explore if the selected material could fulfill its potential by comparing performance of the material in paste/mouldable compound and tape forms and determining a proper level of surface preparation that is not only efficient, cost-effective and practical for field patch application, but also provides the long-lasting performance. Ultimately, the insights into the consideration and selection of suitable viscoelastic materials for the intended applications are presented and a new approach for a viscoelastic patch system is proposed.

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