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The Naval Nuclear Laboratory (NNL) has performed evaluations of SCC in 304/304L stainless steel since 2005 with the goal of developing an empirical equation. Testing has focused on the effects of temperature, stress intensity factor, material cold work, orientation, and sulfur content on SCC in hydrogenated water. Non-Arrhenius growth, termed herein as high temperature retardation (HTR), was observed in several studies where the SCC growth rate was found to slow at elevated temperature at low cold work levels in 316 and 304/304L stainless steel.
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The author previously introduced a method to evaluate protective coatings using a novel segmented cell approach. (1) Briefly, the technique intended to monitor natural current exchange between isolated segments, coated or uncoated, to supplement visual rankings of coating performance. The goal was to predict failure earlier than might otherwise be visible or to distinguish between coatings that had a similar visual appearance at the end of the proscribed test period. The experimental design also allowed for the instrumented segments, which act as sensors, to be prepared and coated as intended for a real-world industrial exposure, i.e., the metallic surfaces could be abrasive blasted and painted unlike thin-film, foil-like sensors also explored for similar purposes.
Seawater biofouling is a major threat in heat exchanger operations. It decreases the heat transfer efficiency and service life of heat exchangers1,2. The formation of deposits caused by biofouling on the heat exchanger metal surfaces increases surface roughness and decreases cross-sectional flow area, which leads to higher friction loss in fluid flow3,4. Mitigation methods, including surface scrubbing, fluidizing bed heat exchangers, cleaning-in-place and dosing anti-fouling chemicals, are the main ways to tackle biofouling5. Conventional approaches to treat biofouled components by periodic electrochlorination or acid flushes are costly and environmentally hazardous. Huge costs are associated with heat exchanger biofouling losses, but there is still a lack of research to develop heat-conducting antifouling coatings to heat exchangers3.
Pipeline under, solids deposition deposit corrosion (UDC) is a localized corrosion phenomenon that develops beneath or around solid deposits, which settle at the bottom of low flow/intermittent flow pipelines. These deposits are complex mixtures of water, organic, inorganic, and biological materials, and their composition can vary significantly depending on the properties of the product being transported and the operating conditions in the pipeline.
The use of access fitting for intrusive corrosion monitoring tools is a common practice in the Oil & Gas industry; however, the Company (Petroleum Development Oman) has faced several difficulties including a recent incident during retrieval operations which has led to suspend, or significantly reduced the use of corrosion coupons and probes, decrease the frequency of retrieval, and eliminate its use in new projects.
Calcium carbonate precipitation in the presence of pollutants is a carrier of importance for their transport to the sediments and for their subsequent release depending on the local microenvironment conditions. Zinc is often present in industrial waters (heat exchangers and boilers) mainly for corrosion protection. Depending on the alkalinity and calcium concentration of waters used in water intensive processes, calcium carbonate fouling is common. Moreover, among other metals, is present in natural waters together with iron and copper, where the concentration of Zn(II) may reach at levels of several ppm.
The -850 mV (CSE) criterion refers to the polarized pipeline potential that is free of any IR-drop. Different methods to obtain the polarized potential exist. Interruption of the CP current will cause the current, I, and thus the IR-drop to become zero and the remaining polarization immediately after the interruption is representative of the polarized potential of the pipeline.
In the UK a huge effort was made in the mid to late 2000’s to minimize carbon emissions and the country had seen a rapid increase in wind-turbine generators being installed onshore and increasingly in offshore waters, nearly 2000 were operating in September 2018 and many more are expected in the coming decades. 1 One operator took the challenge to install a number of wind-turbines in the southern sector of the North Sea, just off the coast of south east England. These wind-turbines are constructed using the monopile foundation type principle.
Geothermal fluid pipelines experience temperature changes on startup and shutdown that can be of the order 300 °C. Carbon steel pipeline design can include expansion loops and direction changes to allow for thermal expansion and contraction for the long lengths of pipeline commonly used from geothermal production wells to the geothermal power station and from the station to reinjection wells. In some instances, expansion compensators are used where there is insufficient area for such loops or where the pipe diameter is prohibitively large.
With the rapid development of the economy and acceleration of urban modernization, many high-speed railways and buried pipelines have been built in China. Due to the limitation of space or geographical location, high-speed railways are often constructed in parallel or crossing with long-distance pipelines in some locations. The interference of high-speed railways on pipelines is the result of inductive and conductive coupling, which brings about AC corrosion and other safety issues.
The Precipitation Hardenable (PH) Nickel alloys N09925, N07718, N09945, N09946 and N07725 are widely used for critical downhole oil field applications such as high strength tubing hangers and completion equipment. The materials are particularly useful in High Pressure/High Temperature wells where high strength and corrosion resistance are required in H2S containing production fluids. Over the last 20 years a limited number of field failure investigations in PH Nickel alloys have been related to the presence of sufficient amounts of intergranular precipitates promoting hydrogen embrittlement, which results in brittle cracking of UNS alloys N07718 3,4 and alloy N077255 and N077166.
Sour water stripping is used to remove ammonia (NH3) and hydrogen sulfide (H2S) from sour water streams coming from many operation units to condition it for discharge or reuse.1-3 In a complex refinery, most of the sour water comes from distillation, fluid catalytic cracking, catalytic reforming, coker and acid gas removal units, with many other operations contributing to the balance. The different streams are usually collected in a surge tank for centralized processing via a heat exchanger and a single stripper column, or two in series.