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Most effective and latest technology in corrosion prevention for protection of boiler systems, turbines, pumps, storage tanks, heat recovery steam generator systems, generators, and piping systems. Protection of the system is based on “temporary” corrosion inhibitors.
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The previous quality control process at Newport News Shipbuilding for recording surface preparation, paint application, and associated inspections used a paper system. These records required a vast amount of physical storage space, were difficult to research and track due to the complexity of the records often consisting of multiple sheets of data. To address these problems along with others that contribute to inadequate maintenance of objective quality evidence, the company decided to take the initiative in resolving this issue by developing a paperless QA system.
This paper focuses on the risk of corrosion of austenitic stainless steels following exposure to oxygenated chloride containing waters, such as during hydrotesting or commissioning activities.
Hydrotesting is an activity typically occurring during construction intended to confirm the component's structural integrity for the design and operating pressure. The commissioning phase can use the same water in multiple systems for dynamic commissioning.
Lay-up is a process that provides internal protection on equipment (pipeline, piping, heat exchanger...etc.) and controls internal corrosion by ensuring water and oxygen-free environments. Corrosion may occur and be accelerated by water contact after hydrostatic testing and even a small amount of stagnant water and oxygen ingress will cause bacteria to grow in water which may result in loss of thickness due to high concentration of sulfate-reducing bacteria (SRB) and accelerate internal corrosion in equipment due to Microbiological Induced Corrosion (MIC). Lay-up helps to greatly reduce these risks of internal corrosion and provide assurance of design life. The objective of this study is to identify constructability challenges faced during construction and carry out a lay-up in a cross country pipeline in gaseous services. Six challenges are discussed and explored in the study including: the long duration from water fill to final lay-up, pipeline segments are used as water reservoirs, intermediate/segment lay-up, failure to maintain lay-up, indefinite lay-up periods, and rainwater. A case scenario is used to demonstrate the extent of these challenges and issues. It is hoped that this study will help avoid and minimize these constructability challenges in future cross country gas pipelines projects.
The paper is an overview of the NSRP Surface Preparation and Coating Panel’s (SPC) mission to reduce the cost of building, repairing and maintaining US Navy ships. It will showcase working and recently completed projects that have been implemented on the deck plates.
Traditional water treatment methods pose several challenges to large-vessel preservation. A solution to these challenges involves the application of an immiscible corrosion inhibiting oil partition on the water surface. This paper will highlight challenges of traditional preservation methods and examine the efficacy of one commercial float coat.
On March 8, 1862 in Hampton Roads, Virginia the first iron clad vessel on the seas, the CSS Virginia (known to Northerners as the Merrimac), had its way with the navy of the Union. It was able to sail unmolested among the ships of the Union Navy and fire at will while taking hits itself with impunity. When dusk arrived the Virginia went to anchorage to wait for sunrise when it could inflict more damage.
Many industries are operating under severely limited O&M budgets and have been for some time. “Lean and mean” in today’s reality has become “mal-nourished and over stressed”. The last major corrosion study conducted in our industry showed a $276 Billion/Yr. deficit of which 75% was unrecoverable. Now a new study has determined that it is never too late to restore measurable viability to a facility's operation through adequate and proper preventive maintenance. This is good news, providing we can adequately demonstrate and use it.
Results are described of sigma phase embrittlement assessments performed at three different refineries and mainly involving regenerator cyclones at fluidized catalytic cracking units (FCCU) but also including regenerator cyclones hanger rods and a regenerator flue gas line.
One of the, if not the most, vexing problems for bridge maintenance personnel is the deterioration of bridge components below leaking joints. The joints may be open or closed, construction or expansion, but all seemingly leak shortly after construction or resealing. The bridge components affected by the leaking joints may be steel or concrete, but the end result is the same, deterioration.