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This paper highlights a successful rehabilitation of a regulated steel line with flexible steel pipe. The pipeline resides under jurisdiction and was approved by both state and federal pipeline safety administrations. Upon completion, the rehabilitated system restored transmission while also reducing overall operating risk. Use of the flexible steel pipe allowed the operator to utilize a dual-containment design while also implementing real-time continuous annulus monitoring on multiple interfaces, effectively reducing risk to environment and local residents.
Often when a polymeric flooring system fails, the cause of the problem is unknown. Forensic testing is used to determine the cause of failure while eliminating other potential causes. A basic understanding of the approach to a forensic investigation and the types of testing used will help aid in correcting the problem so future failures and project costs are reduced.
Corrosion is not just a sustainment concern that impacts the availability and safety of critical structural assets; it is also a damage mechanism that should be considered during the initial design phase. By considering the corrosion process and associated preventive strategies during the design phase it is possible to reduce total ownership cost and improve equipment readiness. The Department of Defense spends more than $23 billion each year to control corrosion on aircraft and other equipment in its operations around the world.
The Federal EPA requires that commercial/residential painting contractors be certified to prepare surfaces containing lead based paint on residential and public structures. As a result, when respirators equipped with HEPA filtration are required to be worn to reduce worker exposure levels to below the permissible exposure limit for lead, the surface preparation work is often subcontracted to a licensed lead abate contractor who holds these types of certifications.
Galvanic anodes have been used to provide various levels of corrosion protection to reinforced concrete structures for many years.
Duplex Coating systems refers to the application of a protective coating system (liquid or powder) over hot-dipped galvanized steel. These systems are often specified and are considered very robust in a wide variety of corrosive environments.
The industry has been developing in-situ techniques to measure pipe properties in lieu of destructive approaches. This paper will review the techniques available to meet regulation changes announced in 2016 and propose procedural applications to improve repeatability and reliability.
From day to day, Robots advance from testing in labs to operating in the outside world. Theindustrial application of Robotic technologies continually increases, providing unique solutions fordifferent challenges. Flare System is an important and critical equipment required for continuoussafe operations for any petrochemical plant addressing proper burning of excess hydrocarbongases, unusable gases which cannot be recovered or recycled, and gas flaring protects againstthe dangers of over-pressure. This paper discusses the different types of robotic inspection,advantages, and limitations based on actual site demonstrations. As an innovative case, here tointroduce actual business case for close aerial inspection and surveying technique to avoidpolyethylene plant shutdown and providing a reliable inspection technique for on-stream integrityevaluation for the flare tip. Drones, formally known as unmanned aerial vehicles (UAVs), are aflying robot that can be remotely controlled, and offer an innovative inspection method launchedbetween 2006-2008 for Engineering professional aerial inspection and surveying using RemotelyOperated Aerial Vehicles (ROAVs). The visual inspection detection accuracy of (ROAV) offerhigher than the normal visual inspection and easily approach all the flare structure from fourdirections. Drone inspection cost is competitive considering the cost of maintenance to dismantlethe flare tip. Drone inspection can be used to assess the elevated flare parts for any seriouslydamage in order to define a clear maintenance scope ahead of shutdown.
Corrosion in the field manifests over a large timescale so when considering material choices in the design of aerospace systems and subsystems use is often made of accelerated tests such as ASTM B117 salt spray chamber test to rank the possible materials. Even these ‘accelerated’ tests take more than 1000 hours and despite their widespread use are often criticized as a design trade tool since the test environments are considerably different to the expected field environment running the risk of either hiding true corrosion processes or simply being unrealistically challenging for the materials under test.The corrosion community has expended substantial effort in trying to make the tests ‘more realistic’ but in doing so there is considerable debate about whether the tools employed to accelerate the corrosion (thermal cycling high salt concentrations UV exposure etc) actually introduce other corrosion processes that are not even present in the eventual targeted field of operation for the device under test.Computational techniques hold a great deal of promise as a way to understand the effects of different service environments but if the simulations cannot even discern between say an ASTM B117 test and an atmospheric exposure then the simulation results would be of questionable value.The processes involved in corrosion are many and complex however one key parameter is the electrolyte film thickness which will clearly be different whether inside a chamber at high humidity with a continuous supply of sprayed saltwater compared to exposure on a beach where diurnal cycles result in a very thin electrolyte of varying salt concentrations except of course when it is raining!To help designers quickly assess corrosion risk and choose appropriate materials Corrdesa have already developed an electrochemical database of modern alloys and coatings. This has been extended by deconvoluting the polarization data to accurately account for the impact of the actual electrolyte thickness on the oxygen reduction reaction.In this paper using fluid shell elements in a free surface flow formulation we actually predict the variable electrolyte film thickness in a CFD (Computational Fluid Dynamics) code for a given environmental condition on different test specimens and geometries. The appropriate polarization data for the local electrolyte thickness is then implemented with User Functions in a potential model framework. In this way the galvanic corrosion is simulated for a test device with a more realistic and variable film thickness.The result is that we can dial different test conditions into the simulation such as whether we wish to simulate chamber results or field results cyclic salt fog cyclic humidity (or both).Keywords: Computational Corrosion Analysis Galvanic corrosion prediction FEA corrosion prediction polarization data potential model fluid shell elements CFD