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Laminations are manufacturing defects that result because of presence of inclusions or air during pipeline plate making. They might present a challenge in identification during ILI inspection as magnetic flux does not identify lamination because it does not have metal loss. Ultrasonic on the other hand can detect lamination, but it does not differentiate from a metal loss.
A bridge coatings specification can be a complex and sometimes confusing document to navigate through. Yet it is regarded as the rulebook for quality control and quality assurance personnel responsible for inspecting the quality of work. An inspection plan is a tool that can make the process of understanding the inspection checkpoints invoked by a bridge coating specification more streamlined and can be a key communication tool for contractor and inspection personnel.
Population growth in city centers has spurred the expansion and new construction of direct current (DC) powered transit systems throughout the world1. Despite stringent design criteria, quality assurance and quality control (QA/QC) monitored construction practices and ongoing track maintenance, it is a fact that DC stray current will eventually occur and negatively impact buried and/or submerged metallic structures immediately adjacent and within the transit right-of-way (ROW)2. In combination with other methods to reduce stray current such as high track-to-earth (TTE) resistance values and shorter distances between substations, transit agencies are specifying the welding of reinforced steel structures within their purview such as retaining walls and footings, approach slabs, aerial inverts, and bridge abutments to prevent stray current from reducing the design life of surrounding metallicstructures.
Many bridge painting projects include steel repairs as part of the contract. Painting and steel repairs are performed by separate trades and often separate contractors. Even designers may see them as separate activities. However, steel repairs and coatings must work together and be installed as a system to perform as intended. This paper is a discussion about the process of installing steel repairs and painting a bridge at the same time.
This case study shows how the City of Virginia Beach addressed concrete tank foundation deterioration and steps taken to reduce future deterioration, including moisture control, impact of Alkali Silica Reaction, concrete analysis and proper surface preparation, coatings applications and inspection.
Risk-based inspection is a business process and improvement tool to enhance asset performance as well as asset life. This paper intends to discuss risk-based coating inspection parameters to enhance coating/lining life and prevent and or mitigate the corrosion threat to assets. This paper further discusses each key aspect of protective coating/lining inspection parameters and its intended purpose.
管道在线检测推荐做法
DOWNLOADABLE HISTORICAL DOCUMENT. Procedure to plan, organize, and execute an In-Line Inspection (ILI) project. A key companion guide to this standard is NACE International Publication 35100.
Control of external corrosion on joints, fittings, and valves in underground metallic piping systems by the application of protective coatings. Selection, Application. Inspection. Historical Document 1990
This standard recommended practice covers the care, handling, transportation, and installation of internally plastic-coated (IPC) oilfield tubular goods and accessories (IPC material). Historical Document 1996
标准 推荐习惯做法 钢板和混凝土上衬里的检查 Application of metallic thermal spray coating (TSC) of aluminum, zinc, and their alloys and composites for the corrosion protection of steel.