To gain a financial benefit, a "smart operator" views inspection as part of an overall strategy t... more To gain a financial benefit, a "smart operator" views inspection as part of an overall strategy to maintain a safe pipeline. This paper shows how periodic internal inspections, followed by defect assessments using fitness-for-purpose criteria and selective repair, is the most cost beneficial way of maintaining the safety of a pipeline. It is highlighted that it is important to use (i) genuine high resolution pigs for the inspection and (ii) expert fitness-for-purpose assessment. The cost savings on the optimized future safe operating strategies for the pipeline offset the costs of the inspection and expert assessment.
Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B, 2006
ABSTRACT Nowadays specifications require strict Yield to Tensile ratio limitation, nevertheless a... more ABSTRACT Nowadays specifications require strict Yield to Tensile ratio limitation, nevertheless a fully accepted engineering assessment of its influence on pipeline integrity is still lacking. Probabilistic analysis based on structural reliability approach (Limit State Design, LSD) aimed at quantifying the yield to tensile strength ratio (Y/T) influence on failure probabilities of offshore pipelines was made. In particular, Tenaris seamless pipe data were used as input for the probabilistic failure analysis. The LSD approach has been applied to two actual deepwater design cases that have been on purpose selected, and the most relevant failure modes have been considered. Main result of the work is that the quantitative effect of the Y/T ratio on failure probabilities of a deepwater pipeline resulted not so big as expected; it has a minor effect, especially when Y only governs failure modes.
Volume 3: Safety and Reliability; Materials Technology; Douglas Faulkner Symposium on Reliability and Ultimate Strength of Marine Structures, 2006
Probabilistic Fracture Mechanics Structural Reliability Analysis of Reeled Pipes. [ASME Conferenc... more Probabilistic Fracture Mechanics Structural Reliability Analysis of Reeled Pipes. [ASME Conference Proceedings 2006, 601 (2006)]. Hugo A. Ernst, Ricardo Schifini, Richard E. Bravo, Diego N. Passarella, Federico Daguerre, Marco Tivelli. Abstract. ...
To gain a financial benefit, a "smart operator" views inspection as part of an overall strategy t... more To gain a financial benefit, a "smart operator" views inspection as part of an overall strategy to maintain a safe pipeline. This paper shows how periodic internal inspections, followed by defect assessments using fitness-for-purpose criteria and selective repair, is the most cost beneficial way of maintaining the safety of a pipeline. It is highlighted that it is important to use (i) genuine high resolution pigs for the inspection and (ii) expert fitness-for-purpose assessment. The cost savings on the optimized future safe operating strategies for the pipeline offset the costs of the inspection and expert assessment.
Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B, 2006
ABSTRACT Nowadays specifications require strict Yield to Tensile ratio limitation, nevertheless a... more ABSTRACT Nowadays specifications require strict Yield to Tensile ratio limitation, nevertheless a fully accepted engineering assessment of its influence on pipeline integrity is still lacking. Probabilistic analysis based on structural reliability approach (Limit State Design, LSD) aimed at quantifying the yield to tensile strength ratio (Y/T) influence on failure probabilities of offshore pipelines was made. In particular, Tenaris seamless pipe data were used as input for the probabilistic failure analysis. The LSD approach has been applied to two actual deepwater design cases that have been on purpose selected, and the most relevant failure modes have been considered. Main result of the work is that the quantitative effect of the Y/T ratio on failure probabilities of a deepwater pipeline resulted not so big as expected; it has a minor effect, especially when Y only governs failure modes.
Volume 3: Safety and Reliability; Materials Technology; Douglas Faulkner Symposium on Reliability and Ultimate Strength of Marine Structures, 2006
Probabilistic Fracture Mechanics Structural Reliability Analysis of Reeled Pipes. [ASME Conferenc... more Probabilistic Fracture Mechanics Structural Reliability Analysis of Reeled Pipes. [ASME Conference Proceedings 2006, 601 (2006)]. Hugo A. Ernst, Ricardo Schifini, Richard E. Bravo, Diego N. Passarella, Federico Daguerre, Marco Tivelli. Abstract. ...
Uploads
Papers by Marco Tivelli