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This paper begins with a brief discussion of essential properties of all pipeline coatings, and a listing of multi-layer systems designed to meet specific needs. It then focuses on special considerations regarding application parameters for multi-layer systems that use fusionbonded epoxy as the primer.
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Two large scale problems with three layer polyolefin (3LPO) coatings are discussed here and possible reasons for the failures. Lessons learned and recommendations for future usage of such coatings are provided.
Three layer polypropylene (3LPP) pipeline coatings failed prematurely in the oilfields of Abu Dhabi in the United Arab Emirates (UAE). A failure investigation and analysis into this phenomenon was instigated. The coating disbondment has been found to be due to high residual stress concentration and adhesion loss.
Evaluation of subsea wet thermal insulation coating materials via exposure to seawater for a 12-month period at high temperatures and high pressures is presented in ISO(1) 12736:2014. How to interpret and apply the results of this testing to the design and qualification of subsea wet insulation systems is presented.
HISTORICAL DOCUMENT. This NACE standard test method describes a reliable measuring methodology for determining the gouge resistance of coating systems used on buried ferrous metal pipelines.
The glass transition temperature (Tg) is an important property, as it is a reflection of both the type of resins in a coating and its degree of cure. This paper discusses what Tg is, the measurement of Tg, and its relationship to coating performance. Data is presented which indicates that the performance of a coating may depend on the conditions under which it is cured, such that the exact same coating may perform differently depending on the region of the country in which it is used and the time of year in which it is applied.