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Surface preparation techniques have evolved with the acceptance of UHP waterjetting (UHP WJ). The new technique has proven to provide benefits in not only workflow, but also in the overall project’s pocketbook as well. With quality requirements rising and budgets for maintenance activities decreasing, UHP WJ has become the ideal surface preparation solution.
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Almost 20 years ago the use of Ultra High Pressure Waterjetting (UHP) in shipyards for maintenance and for offshore projects started to be pushed, due to the development of surface and moisture tolerant paint technology becoming available. This was recognized by the likes of US Navy and Petrobras at the time.
Current fatigue assessments for the fatigue life of a plant component are usually based on methodologies that use uniaxial fatigue test data (i.e. ASME Section III, and are intended to be conservative for design and fitness-for-purpose assessments when applied to plant components and loading. This data is generated through cyclic loading of specimens at a constant amplitude, and failure is usually defined as when there is a load drop of 25% from steady state stress under strain-controlled conditions (or specimen separation for stress control). The corresponding number of cycles is then used as the definition of fatigue life for a particular strain amplitude. It is known that there are differences between fatigue behaviour in an idealised laboratory setting and in-service components which can contribute to excessive conservatism in plant assessments.
The objective of this study was to examine the effects of an ultra-high pressure (UHP) waterjetting surface preparation (>25,000 psi) on the performance properties of select marine/offshore coating epoxy systems. Uncoated steel panels had been allowed to rust in an outdoor atmospheric environment and then were subjected to UHP waterjetting
The twenty-first century presents a major challenge to coatings manufacturers. The amount of solvent allowable in many coatings has been reduced considerably. In order to attain these lower VOC’s, coatings formulators are searching for resins that have low VOC demand, as well as ways of formulating that can replace the high volumes of solvent used in the past
Poor performance of materials…is why…more realistic application conditions are needed. An ultra-tolerant material, compatible with flash rust, humidity, poor profile and cold application conditions, potentially with Ultra High Pressure (UHP) water jetting, is presented in this paper.
Solventborne alkyd resins are widely used in industrial coatings because of their excellent gloss, good adhesion and wetting properties as well as excellent compatibility with other resin types. In many regions, however, the consumption of alkyds is diminishing as stringent environmental regulations drive the coatings industry towards lower volatile organic compound (VOC) systems. Waterborne (WB) coating systems have replaced some solventborne (SB) alkyd paints; however, these WB coatings typically do not offer the same performance as their solventborne counterparts.
In a pipe, guided Lamb-like waves can propagate around the circumference of the pipe wall. As they do, the waves pick up details about the pipe wall’s characteristics, such as its inner surface condition and, most significantly, its thickness. A robust pipe wall thickness estimation method based on conventional (i.e., non-machine learning) processing methods has been proposed by the authors.
The search for environmentally friendly and greener materials in the polymer field is further explored to decrease dependency toward petroleum-based products. Sucrose soyate, a complex molecule of sucrose and fatty acids of soybean oils, provide an alternative renewable material for petroleum-based coating resins in addition to the already existing choice of drying oils
This paper considers the parameters that affect chloride induced corrosion in reinforced concrete structures and the effect of. variance in some of the parameters that influence the initiation period of chloride induced corrosion in reinforced concrete structures, on the service life estimates.
Deposits can play an important role in the corrosion rate and morphology of carbon steel in a production environment as well as affect the efficacy of an inhibitor. A test method has been developed to investigate the corrosion characteristics of carbon steel in a stratified flow regime where deposits of solids accumulate in the bottom of a pipeline.Previous testing showed higher under deposit corrosion rates of API X-65 carbon steel when the deposit consists of iron sulfide (FeS) versus sand in a 100%H 2 S environment. There is a needto investigate the effect of CO2 on these findings as the lower pH should affect the corrosion rate morphology and galvanic action particularly with respect to the FeS deposits.This paper presents the effect of mixed gases (50%H 2 S + 50%CO2 ) on corrosion behavior of API X-65 carbon steel coupons in the FeS and sand deposits. The average corrosion rate thickness loss of the coupons and pitting at the solid/liquid interface will be presented.Keywords: Under deposit corrosion Iron sulfide (FeS) sand mill scale acid gases