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Most cured epoxy resins provide excellent mechanical strength and toughness as well as outstanding chemical, moisture, and corrosion resistance. They also have good thermal, adhesive, and electrical properties, no volatiles emissions, low shrinkage upon cure and dimensional stability1. This unique combination of properties coupled with outstanding formulating versatility and reasonable costs, have gained epoxy resins wide acceptance as materials of choice for a multitude of protective coatings applications.
Epoxy resin-based coatings have been used for many years to line the inside of chemical storage tanks and process vessels due to their good thermal and chemical resistant properties in Oil & Gas industry. They are particularly suited for services that require resistance to hydrocarbons, water immersion, caustics and acids. A lot of paint manufacturers and coating formulators are working on this area to develop new product to meet the more and more challenging requirements.Several unique multifunctional epoxy resins and amine curing agents have been developed, which offer superior performance in HTHP chemical resistant liner application. A detailed low VOC, high solids chemical resistant liner formulation is described. Various performance aspects of experimental and commercial benchmark are compared, including dry time, Tg, hardness, multiple chemicals immersion tests at elevated temperature, up to > 400 oC dry heat test and thermal cycle test. Experimental formulas demonstrated better solvent resistance, high temperature water immersion performance and dry heat resistance comparing with the commercial control.
The demand for high temperature (≤150⁰C) protective coating systems for offshore service has proliferated due to the increase in high temperature pipelines developments in Asia Pacific and Gulf of Mexico regions. Three-layer Polypropylene and multi-layer coating systems are typically used as anti-corrosion coatings for offshore pipelines as they are capable of withstanding operating temperatures as high as 150⁰C and they are resistance to water and mechanical damage. Recently there is an increasing interest in using standalone fusion bonded epoxy coatings single or dual-layer systems for high temperature offshore services. However there is insufficient data available to determine the fitness of purpose for offshore HT environments. Different HT FBE were evaluated and this presentation discusses the performance of coating systems subjected to simulated service testing. In addition test results obtained from a 2-year thermal ageing programunder nitrogen environment will be reviewed and compared between standalone HT FBE and 3LPP coating systems. A qualification protocol will be introduced for HT coating systems for offshore pipelines.
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It is fair to say that maintenance in the worldwide oil and gas industry has changed dramatically over the past ten years. Facility owners are more than ever looking to reduce shutdown times, to improve plant efficiency and to extend plant lifetimes. With this comes the increased industry understanding about corrosion under insulation (CUI) with its deleterious impact and the ongoing desire for pragmatic high performance and cost-effective coating solutions.
The crude oil produced by fracking or hydraulic fracturing method are high in sulfur content (0.5%)1. The vast majority of vessels that are used in the petrochemical industry to store and transport materials are constructed using Carbon steel. Coating linings used for corrosion protection inside of vessels and tanks must perform under severe conditions such as an exposure to corrosive gasses ( H2S) and carbon dioxide as well as high temperatures, high pressures and often must withstand the cold wall effect and rapid decompression.