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Collaborating Authors
Measurement and Control
Abstract It is a trend to construct and operate with complex and large-sized offshore platforms. Offshore platforms would be operated for a long time over 20~30 years. Moreover, more costs and efforts are invested in operation and maintenance (O&M) phase than construction phase. Oil majors and operating companies recently focuses on huge costs for operation and maintenance. They would have an interest in efficient operation and appropriate maintenance to ensure facility integrity. A modernized and optimized maintenance methodology would be on the rise to business competitiveness. A Condition-based Maintenance (CBM) is the key solution for these requirements. We define the process of prediction of residual life based on conditions and propose the system configuration of CBM solution. In this paper, we introduce the CBM solution for offshore platforms. CBM would be defined by the maintenance plan that predicts a lifetime of equipments via expert diagnosis with operating conditions and ensures the seamless operation by repairing them before breakdowns or faults. The CBM solution would be a decision-making support solution to preserve facilities before breakdown. It would expertly diagnose equipment states based on data gathered by SCADA system and predict accurately a residual lifetime by measuring and reasoning of deterioration.
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems (1.00)
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Facilities Design, Construction and Operation > Measurement and Control > SCADA (0.58)
Abstract Transmission pipelines that cross regions prone to ground movement events can experience large longitudinal strains resulting in circumferential strains due to Poisson's effect. The design trend for new pipelines in areas prone to ground movement has evolved from a stress-based design approach to a strain-based design (SBD) approach to further realize the cost benefits from using higher strength line pipe steels. This paper presents an overview of SBD for pipelines subjected to large cyclic longitudinal strain and high internal pressure, with emphasis on the cyclic tensile strain capacity of microalloyed line pipe steel. The technical basis for this paper involved engineering analysis and examination of the mechanical behavior of grade X80 line pipe steel in both the longitudinal and circumferential directions. Low-cycle fatigue analyses were performed with varying internal pressures. SBD models discussed in this paper are based on classical plasticity theory and account for material anisotropy, triaxial strain, and microstructural damage effects developed from test data. The results are intended to enhance SBD and analysis methods for producing safe, cost-effective pipelines capable of accommodating large plastic cyclic strains.
- Materials > Metals & Mining > Steel (0.75)
- Energy > Oil & Gas > Midstream (0.68)
- Government > Regional Government > North America Government > United States Government (0.31)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers (0.67)
- Facilities Design, Construction and Operation > Measurement and Control > Pipeline leak detection (0.34)