![csa z662-11 csa z662-11](https://d3i71xaburhd42.cloudfront.net/67db4cdea2b78be5c1cc1b821312f9fc22c12b1b/13-Table3-1.png)
Section 10.10.4.2 of CSA Z662-19 provides the wider industry with a number of screening criteria for the identification of deformations that require further investigation, assessment or remediation.
![csa z662-11 csa z662-11](https://image.slidesharecdn.com/8b118a40-ea15-4107-b8a9-8e47d64377f2-150526223736-lva1-app6892/95/2-fdrrae-int-training-2015-pipeline-integrity-copy-26-638.jpg)
This study explores the impact of this change and the conservatism within the available screening criteria, such as the depth-based and sharpness clauses given in Section 10 of CSA Z662-19. November 2018, the American Society of Mechanical Engineers (ASME) revised the equations given in the non-mandatory Appendix R, which is used to calculate equivalent strain on the internal and external pipe surfaces. They also explore the impact this may have on the Canadian Standards Association (CSA) screening criteria used by Canadian operators. In this context, Krystin Cousart and Chris Holliday from ROSEN Canada analyze how the recent changes to ASME B31.8, specifically the revision of the equations for dent strain assessment, result in an increase in strain results. These standards are routinely revised and amended in line with the latest industry research and guidance. Therefore, international standards agencies, such as the American Society of Mechanical Engineers (ASME), issue relevant standards that regulate the design, operation, maintenance and integrity management of pipelines. That is because safely transporting energy products through pipelines is the key to the success of the oil and gas industry. There are standards for almost everything – machines, cars, technical and medical equipment – and, of course, there are standards for pipelines. Mots-cles : gazoduc, corrosion-destruction du metal, probabilite d'eclatement, indice de fiabilite, coefficient de pression de rupture, facteur d'utilisation.Why do we need standards? They play a key role in keeping us safe.
#CSA Z662 11 PLUS#
Grace a cette etude, il sera plus facile de controler, grace a l'analyse des risques et de la fiabilite, la corrosion sur les gazoducs de gaz. Ces equations peuvent servir a determiner le CPR seuil correspondant a un indice de fiabilite cible (ou probabilite d'eclatement permise) pour un facteur d'utilisation donne et permettent ainsi de reperer les points de corrosion importante et de limiter cette derniere. A partir des resultats de l'analyse, on developpe des equations de regression lineaire qui relient le CPR a la l'indice de fiabilite dans le cas de gazoducs ayant des facteurs d'utilisation differents. Les resultats de l'analyse effectuee montrent qu'il existe une relation lineaire entre le CPR et l'indice de fiabilite correspondant a la probabilite d'eclatement du gazoduc dans le cas de conduites ayant un facteur d'utilisation identique.
![csa z662-11 csa z662-11](https://dynamicrisk.net/wp-content/uploads/2021/04/Blog3-Image.png)
La pression maximale de fonctionnement des gazoducs etudies, le type d'acier dont elles sont constituees, l'epaisseur de leur paroi, leur diametre externe et leur facteur d'utilisation sont variables. Les coefficients de pression de rupture (CPR) et les probabilites d'eclatement associees a la corrosion d'etendue variable sur des gazoducs typiques sont estimes a l'aide du modele modifie ASME B31G et de la methode de fiabilite du premier ordre. Le present article traite de l'attenuation, basee sur la fiabilite, de la corrosion-destruction du metal sur les gazoducs. Key words: gas transmission pipeline, metal-loss corrosion, probability of burst, reliability index, failure pressure ratio, and utilization factor. This study will facilitate the risk- and reliability-based corrosion management of gas transmission pipelines. The equation can be employed to determine the threshold FPR corresponding to a target reliability index (or allowable probability of burst) for a given utilization factor to identify critical corrosion defects for mitigation. Based on the analysis results, linear regression equations that relate FPR to the reliability index are developed for pipelines with different utilization factors. The analysis results suggest that FPR and the reliability index corresponding to the probability of burst follow a linear relationship for pipelines with the same utilization factor. The pipelines considered have different values of the maximum operating pressure, steel grade, wall thickness, outside diameter, and utilization factor. The failure pressure ratios (FPRs) and probabilities of burst associated with corrosion defects with various sizes on representative gas pipelines are evaluated using the ASME B31G Modified model and first-order reliability method. Abstract : This article deals with reliability-based mitigation of metal-loss corrosion defects on steel natural gas transmission pipelines.