Comparison of Feasibility of a Standard Reliability-Based Approach and a Bayesian Network Approach for Integrity Management of a Northern Canadian Liquids Pipeline

2020 ◽  
Author(s):  
Smitha D. Koduru ◽  
Mona Abdolrazaghi ◽  
Nader Yoosef-Ghodsi
Keyword(s):  
Bayesian Network ◽  
Crack Detection ◽  
Management Tool ◽  
Network Approach ◽  
Data Gaps ◽  
Integrity Management ◽  
Unique Approach ◽  
Girth Welds ◽  
Effective Use ◽  
Existing Data

Abstract Integrity management of a northern Canadian liquid pipeline required a unique approach due to the presence of methanol-induced, short, axially-oriented, internal stress corrosion cracking (iSCC) adjacent to girth welds. Previous studies focused on investigation of the susceptibility to iSCC, crack detection performance of inline inspection tools, and leak rates due to iSCC. The current feasibility study aimed to identify an approach to estimate the probability of leak due to iSCC that uses information from previous investigations and handles the data gaps. Two probabilistic approaches — a standard reliability-based approach and a Bayesian Network approach — were compared based on a number of criteria related to effective use of existing data, flexibility of the framework, and ability to iteratively improve the results. The results of the comparison indicate that a hybrid of the two approaches is an ideal way to develop a comprehensive integrity management tool.

STRATEGI PENDAYAGUNAAN ZAKAT PRODUKTIF UNTUK PEMBERDAYAAN KESEJAHTERAAN MUSTAHIQ

2017 ◽  
Vol 18 (2) ◽  
pp. 257-289
Author(s):  
Dewi Dewi
Keyword(s):  
Management Strategy ◽  
Program Management ◽  
Health Programs ◽  
Network Approach ◽  
Education Programs ◽  
Program Monitoring ◽  
Economic Program ◽  
Business Condition ◽  
Effective Use

Abstract : The Utilization Program of zakat, infak, and alms LAZISNU Banyumas there are four namely: Nu-Preneur, Nu-Smart, Nu-Skill, and Nu-Care. However, by 2017 following LAZISNU provisions, the Center will be replaced with education programs, economic programs, health programs and disaster programs. In maximizing the four programs, especially the Nu-Preneur (economic) program management strategy is using network approach, mustahik character, and business condition mustahik. The utilization of productive zakat in order to empower the mustahik welfare is valued effective. The effective use of zakat is considered effective in empowering the mustahik welfare and it can be measured from several elements, namely: The accuracy of program targets, program socialization, program objectives and program monitoring. Keywords: Program, utilization, LAZIZNU.

Effective Improvements to Reliability Based Corrosion Management

2010 ◽  
Author(s):  
Shahani Kariyawasam ◽  
Warren Peterson
Keyword(s):  
Decision Making ◽  
Oil And Gas ◽  
Data Gathering ◽  
Effective Area ◽  
The Face ◽  
Integrity Management ◽  
Reliability Methods ◽  
Specific Growth Rates ◽  
Safe Condition ◽  
Effective Use

Reliability methods have being adopted by oil and gas operators for integrity management decisions. These methods explicitly account for all relevant uncertainties and are designed to provide consistent safety. Consequently, a risk or reliability based approach is a very appropriate basis for decision making in the face of uncertainties. However, as in the effective use of any powerful methodology the sensitivities of the method to assumptions and limitations of applicability need to be well understood. This paper presents how improvements were made to reliability based integrity program by understanding its limitations and sensitivities. First the inputs that have the highest impact on the results were identified. These inputs are the most appropriate areas for improvement and data gathering. It is also very important to understand how the results are to be used and for what purpose. The results of this particular inline inspection based reliability assessment are used to make better excavation and repair decisions. A defect-based and joint-based decision making process is essential for determining with sufficient confidence if each defect and joint is in a safe condition. Consequently, the improvements are focused on discriminating between the myriad of defects found during an inline inspection run. Distinct field characteristics of corrosion growth are also taken into account in these improvements. The paper presents the implementation of effective area methods for future integrity probabilistic evaluations. It also describes the benefit of applying defect-specific growth rates. Finally, case studies are presented to demonstrate the effectiveness of the changes.

A discrete-time Bayesian network approach for reliability analysis of dynamic systems with common cause failures

2021 ◽  
pp. 108028
Author(s):  
Yongjin Guo ◽  
Mingjun Zhong ◽  
Chao Gao ◽  
Hongdong Wang ◽  
Xiaofeng Liang ◽  
...  
Keyword(s):  
Bayesian Network ◽  
Reliability Analysis ◽  
Discrete Time ◽  
Dynamic Systems ◽  
Network Approach ◽  
Common Cause ◽  
Common Cause Failures

Integrity Management of Ground Movement Hazards

2016 ◽  
Author(s):  
Yong-Yi Wang ◽  
Don West ◽  
Douglas Dewar ◽  
Alex McKenzie-Johnson ◽  
Millan Sen
Keyword(s):  
Management Program ◽  
Ground Movement ◽  
Tensile Failure ◽  
Weld Strength ◽  
Factors Affecting ◽  
Ground Movements ◽  
Decision Points ◽  
Starting Point ◽  
Integrity Management ◽  
Girth Welds

Ground movements, such as landslides and subsidence/settlement, can pose serious threats to pipeline integrity. The consequence of these incidents can be severe. In the absence of systematic integrity management, preventing and predicting incidents related to ground movements can be difficult. A ground movement management program can reduce the potential of those incidents. Some basic concepts and terms relevant to the management of ground movement hazards are introduced first. A ground movement management program may involve a long segment of a pipeline that may have a threat of failure in unknown locations. Identifying such locations and understanding the potential magnitude of the ground movement is often the starting point of a management program. In other cases, management activities may start after an event is known to have occurred. A sample response process is shown to illustrate key considerations and decision points after the evidence of an event is discovered. Such a process can involve fitness-for-service (FFS) assessment when appropriate information is available. The framework and key elements of FFS assessment are explained, including safety factors on strain capacity. The use of FFS assessment is illustrated through the assessment of tensile failure mode. Assessment models are introduced, including key factors affecting the outcome of an assessment. The unique features of girth welds in vintage pipelines are highlighted because the management of such pipelines is a high priority in North America and perhaps in other parts of the worlds. Common practice and appropriate considerations in a pipeline replacement program in areas of potential ground movement are highlighted. It is advisable to replace pipes with pipes of similar strength and stiffness so the strains can be distributed as broadly as possible. The chemical composition of pipe steels and the mechanical properties of the pipes should be such that the possibility of HAZ softening and weld strength undermatching is minimized. In addition, the benefits and cost of using the workmanship flaw acceptance criteria of API 1104 or equivalent standards in making repair and cutout decisions of vintage pipelines should be evaluated against the possible use of FFS assessment procedures. FFS assessment provides a quantifiable performance target which is not available through the workmanship criteria. However, necessary inputs to perform FFS assessment may not be readily available. Ongoing work intended to address some of the gaps is briefly described.

Sign in / Sign up

Export Citation Format

Share Document