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Upstream oil production assets, including oil production pipeline network and gas oil water separation facilities, play a dominant role in sustaining production targets to meet customer requirements. Corrosion management of such assets encompasses various phases, such as design, construction, operation, and decommissioning. Proper engineering design and sound construction practices combined with effective monitoring are essential to manage and maintain the corrosion of these assets within acceptable limits. Some of the considerations taken into account during design include: safety, environment, pressure, temperature, material availability, delivery time, and cost. Operating these assets outside of the design boundaries could influence the corrosion process, significantly impacting integrity. Close monitoring of operating parameters, along with identifying the corrosion by employing appropriate inspection techniques, and implementing timely corrective measures, are of paramount importance to preserving the integrity of these critical assets, which otherwise could lead to safety and environmental issues. This paper highlights three case studies involving the importance of cathodic protection monitoring, and failure analysis of an oil pipeline, along with corrosion inhibitor optimization efforts carried out to ensure asset integrity.
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For many decades, paint strippers have used hazardous solvents such as methylene chloride and N-Methyl-2-pyrrolidone (NMP) to effectively remove paints and coatings. But safety and environmental concerns have introduced an urgent need for environmentally-friendly alternatives. In March 2019, EPA banned the use methylene chloride in all paint removers for consumer use. However, its replacement, NMP, is now also deemed as a substance of very high concern (SVHC) and in jeopardy of being an option for paint stripping by regulatory forces.
The newly developed green paint stripper discussed here is free from methylene chloride and NMP. It achieves an environmentally-friendly profile by utilizing agricultural base stocks and recycled industrial solvents. It meets USDA criteria for biobased paint strippers and graffiti removers, and it complies to the VOC requirements of the California Reduced Emission Regulation for Consumer Products. This low odor and biodegradable paint stripper/graffiti remover effectively removes acrylic, alkyd, and urethane-based coatings, as well as marker ink comparably to petrochemical-based and NMP-containing products. In addition, the product contains corrosion inhibitors to prevent discoloration and flash rust on ferrous metals, aluminium, copper, and brass during and after paint removal.
Numerous industry studies have shown a lack of correlation between outdoor weathering performance in Florida, and performance in common accelerated weathering tests-- particularly when multiple types of resins are being compared. No single accelerated weathering test exists that can predict the outdoor performance for every type of resin in every color.
An oil shale field was found to exhibit classic signs of a heavy microbial burden. Data generated by this exhaustive testing and screening were used to influence biocide choice and applications in the field. Impact of biocides on the field microbial characteristics are described and discussed.
The permeance of coatings applied to the walls of Single Wythe concrete masonry units (CMU) can affect the long-term performance of the coating system, especially after multiple repaints. This paper describes the results of a study to determine if the Atlas Cell Test (NACE TM0174/ASTM C868) can be modified to evaluate the performance of individual coating systems based upon permeance.
A natural gas transmission pipeline is routed through South Texas where cathodic protection levels can vary significantly throughout the year. This paper discusses the use of precision electrical resistance type corrosion rate probes and remote monitoring of the probe corrosion rate.
Close interval surveys (CIS) and remote monitoring units (RMUs) can be used as complimentary technologies, essential for validating safe operation of a cathodic protection (CP) system. CIS on a pipeline is typically performed once every few years due to the high cost and time commitment of the process, but the benefit is a high spatial resolution of measurements, with typical spacings between reading locations on the metre length-scale. RMUs installed at test posts with a typical spacing of multiple kilometres between units can be used to measure comparable electrical readings year-round without requiring a human to physically travel to each location.
The fire water system on an offshore facility is a critical system. In the event of a fire, this system must not only deliver water for active fire management, but the system must also survive the worst-case scenarios of blast, jet fire and or hydrocarbon fire and for a duration anticipated in that scenario. The fire water system must also survive the duration of time needed for the safe evacuation of personnel from the facility.This paper addresses the complexities involved in the use of composite pipes for fire water applications. It focuses on how blast effects are managed and the survivability of GRE piping in highly intense and high heat flux fire cases. Results from tests simulations will be shared which were carried out to assure certifying body, operator and engineer that GRE piping is the right material of choice for this application under such circumstances.The paper concludes with examples of several floating production and storage offloading facilities installed with GRE piping for the fire water application.
Thermal insulation is used in operating facilities to conserve heat and protect against freezing amongst others. A consequence of insulating the pipe is the necessity to manage the introduced threat of corrosion under insulation (CUI). For CUI to occur water and oxygen must enter and migrate through the insulation to reach the external surface of the pipe. The water transport characteristics are dependent on several factors such as type of insulation type of jacketing pipe operating temperature external weather water entry/leakage rate and cyclic service. In hot piping there are competing water transport characteristics as in water vapor moves outwards away from the pipe as water enters into insulation. Knowing the water transport and the parameters that influence the time of wetness at the metal surface helps in understanding conditions favoring CUI.The use of transient hygrothermal models for moisture control is well established in the building insulation design codes and standards. The building designs naturally shed the liquid water to minimize entry and facilitate breathing of vapor so that moisture doesn’t accumulate within building. Several building industry hygrothermal models have been developed and are available for commercial use. One such commercial model has been used to understand water transport in a CUI application. The case study involves evaluation of piping and pipeline installed with a closed cell polyurethane insulation. The hygrothermal model provided insights on the parameters influencing the time of wetness and the ease of water escaping the pipe-insulation-jacketing system. Additional results comparing different insulations are also presented.Key words: Corrosion under insulation water transport hygrothermal models building industry polyurethane insulation