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PRCI PR-244-9517
- Limit States and Reliability-Based Pipeline Design
- Report / Survey by Pipeline Research Council International, 06/01/1997
- Publisher: PRCI
$398.00$795.00
L51769e
Centre for Engineering Research, Inc
Need: To develop fully calibrated limit states design (LSD) procedures for pipelines. Limit states design, also known as load and resistance factor design (LRFD), provides a unified approach to dealing with all relevant failure modes and load combinations of concern. It explicitly accounts for the uncertainties that naturally occur in the determination of the loads which act on a pipeline and in the resistance of the pipe to failure. The load and resistance factors used are based on reliability considerations; however, the designer is not faced with carrying out probabilistic calculations.
Benefit: LSD is the way of the future and suggests that if pipelines are designed directly for those scenarios which are known to be the major causes of pipeline failure, the result will be better design in terms of both safety and economy. This study shows that LSD is a rational and logical design process that can provide consistent levels of safety and give the designer a clear picture of the structural response of the pipe for all credible failure modes.
Result: This report provides: background information concerning limit states and reliability-based design; limit states design procedures; results of the reliability analyses that were undertaken in order to begin the process of calibration; recommendations for future development work; and several design examples in order to demonstrate use of the method.
The reliability analysis work conducted shows that the probability of failure of a defect free pipe subject only to internal pressure is extremely low and emphasizes the need to consider the major causes of pipeline failure (corrosion and outside force damage) in developing and calibrating the limit states design procedures. Preliminary reliability-based analysis work related to calibrating design methods for both of these failure scenarios, as well as a number of others (local buckling, crossings and ductile fracture propagation) is also presented.
Centre for Engineering Research, Inc
Need: To develop fully calibrated limit states design (LSD) procedures for pipelines. Limit states design, also known as load and resistance factor design (LRFD), provides a unified approach to dealing with all relevant failure modes and load combinations of concern. It explicitly accounts for the uncertainties that naturally occur in the determination of the loads which act on a pipeline and in the resistance of the pipe to failure. The load and resistance factors used are based on reliability considerations; however, the designer is not faced with carrying out probabilistic calculations.
Benefit: LSD is the way of the future and suggests that if pipelines are designed directly for those scenarios which are known to be the major causes of pipeline failure, the result will be better design in terms of both safety and economy. This study shows that LSD is a rational and logical design process that can provide consistent levels of safety and give the designer a clear picture of the structural response of the pipe for all credible failure modes.
Result: This report provides: background information concerning limit states and reliability-based design; limit states design procedures; results of the reliability analyses that were undertaken in order to begin the process of calibration; recommendations for future development work; and several design examples in order to demonstrate use of the method.
The reliability analysis work conducted shows that the probability of failure of a defect free pipe subject only to internal pressure is extremely low and emphasizes the need to consider the major causes of pipeline failure (corrosion and outside force damage) in developing and calibrating the limit states design procedures. Preliminary reliability-based analysis work related to calibrating design methods for both of these failure scenarios, as well as a number of others (local buckling, crossings and ductile fracture propagation) is also presented.
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