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Risk-based inspection is a business process and improvement tool to enhance asset performance as well as asset life. This paper intends to discuss risk-based coating inspection parameters to enhance coating/lining life and prevent and or mitigate the corrosion threat to assets. This paper further discusses each key aspect of protective coating/lining inspection parameters and its intended purpose.
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Protecting carbon steel oil and gas pipelines with thermoplastic liners is a proven and cost-effective solution to prevent internal corrosion and abrasion. However, the industry is still facing considerable challenges when it comes to fittings and accessories such as elbows, tees, process equipment and complicated shapes.Rotational lining (aka rotolining) is a technology which bonds a single/multi layered uniform, vacuum resistant, seamless polymer layer to the interior of virtually any metallic structure, regardless of shape and complexity. Once cooled, the result is a monolithic corrosion and chemical resistant lining that conforms to complex shapes and virtually free of stresses. This system results in a high quality and fully thermoplastic lined system.Rotolining has been proven to provide long-term protection against corrosion and abrasion in various applications including saline water pipe systems, hydrocarbon service, mining and highly aggressive chemical service. This lining system can cover a wide range of fluid requirements, temperatures and applications using high-performance thermoplastics such as HDPE, PA-12, PVDF, ETFE and PFA. Rotolining is a cost-effective alternative to conventional solutions such as FBE, corrosion resistant alloy cladding or continuous chemical injection programs.In this paper, some of the insights of the rotational lining system and usage of different high-performance thermoplastics are shared. This includes some very challenging and internationally proven case studies, which substantially benefited the entire value chain as long-term solutions
The US Army Corps of Engineers, Paint Technology Center (PTC) is a Technical Center of Expertise forall things paints and coating for the Corps and Army. The PTC has a mission, among other things, toexecute research and development directly related to the corrosion mitigation properties of commercialand experimental coatings. As part of this effort, coated panels are subjected to accelerated weatheringconditions and rust creep is quantified to determine the level of recommended mitigation.
This paper provides an overview of the risk assessment methodology and how it is applied to assess and monitor the risks in conjunction with a rigorous corrosion monitoring program comprising of multiple ultrasonic sensor placements. Various case studies are presented.
Unbonded flexible pipes used for transporting process fluids in offshore oil and gas production systems have a complex structure, with alternate polymer and metallic layers. Tensile armors are metallic layers constructed by the helical wrapping of high strength carbon steel wires, and they are responsible for the integrity of the pipe. These armors provide axial strength and torsion resistance to the pipe so that it can sustain its own weight and resist to stresses associated to environmental conditions and vessel motion.
This study describes an effort to find a method to control bacteria in 130 remote freshwater fiber glass storge tanks with an effective low-cost, convenient treatment method. Freshwater, in this application, is being used to control halite scale formed in the production from unconventional oil wells in the Williston, North Dakota, USA area. The water is sourced from local freshwater rivers and trucked to location and stored in 400 barrel (bbl) freshwater tanks. The water stored in the tanks is injected continuously, and the tanks are refilled on a variable schedule.
This standard practice presents guidelines and procedures for use during risk assessment, mitigation, and monitoring of corrosion on underground, cathodically protected steel piping systems caused by proximity to alternating current (AC) power supply systems.
The Florida Department of Transportation (FDOT) undertook recoating of the superstructure steel components of the SR 292 high-level bridge over the Intracoastal Water Way (ICWW) in Perdido Key, Florida, which carries one lane of traffic in each direction and is the only connection between Perdido Key and the mainland. Due to the significant impact to businesses and the public, including tourists, from any proposed lane closures, FDOT looked for other means to address the deteriorating paint system, provide for a longer service life, and complete the work without any lane closures on the bridge.
The U.S. Navy has determined that thermal spray coatings can be used as an alternative to traditional epoxy based nonskid coatings under high temperature applications to extend service life. Traditional nonskid coatings break down under the stresses leading to loss of adhesion, deck corrosion and reduced slip resistance. Using a twin-wire arc spray system, the U.S. Naval Research Laboratory (NRL) successfully applied an aluminum-based ceramic-metallic thermal spray material on the flight deck of USS Wasp (LHD 1).
Steam system in Utility Plant produces Super High Pressure (SHP), High Pressure (HP), Medium Pressure (MP), and Low Pressure (LP) steam. The header of every steam type has a control valve and a silencer downstream to open in case of high pressure. The MP steam header suddenly spiked up following a malfunction of the high range letdown valve from the HP header to the MP header. The MP header vent control valve opened up to control the header pressure. However, the opening of the vent valve led to severe damage to the internals of the silencer. Fortunately, there was no personnel injury or environmental impact, only equipment damage. The direct and root cause of the failure was identified after silencer was offered for internal inspection. Gross corrosion of silencer internals, and silencer design were the direct root causes of this failure. However, an effective mitigation and resolution was implemented by preventing condensate accumulation and providing a way to clean drain lines and prevent pluggage.