Unified Approach to Risk-Based Inspection Planning for Offshore Production Facilities

2003 ◽  
Vol 125 (2) ◽  
pp. 126-131 ◽  
Author(s):  
Michael Havbro Faber ◽  
Daniel Straub ◽  
Jean Goyet
Keyword(s):  
Environmental Risks ◽  
Structural Components ◽  
Inspection Planning ◽  
Unified Approach ◽  
Component Level ◽  
Acceptance Criteria ◽  
Offshore Production ◽  
Generic Modeling ◽  
Production Facilities

Based on new methodological developments in the area of risk-based inspection planning (RBI) for structural components subject to fatigue degradation, the present paper presents a unified approach to risk-based inspection planning for offshore facilities comprising components and systems of both the structural and process type. Suggestions are given for the formulation of acceptance criteria on component level based on overall facility acceptance criteria in terms of risk to personnel, environmental risks and economical risks. The methodology facilitates a generic modeling of fatigue and corrosion degradation for both structural and process type components. Furthermore, special considerations are given to the important aspect of updating of inspection plans when degradation has been observed. The different aspects of RBI for steel components subject to fatigue and corrosion degradation are illustrated on an example considering RBI for the components of a tripod well-head platform.

Maintenance Integrity: Managing Flange Inspections on Aging Offshore Production Facilities

2011 ◽  
Author(s):  
R. M. Chandima Ratnayake ◽  
S. M. S. M. K. Samarakoon ◽  
Tore Markeset
Keyword(s):  
Risk Perception ◽  
Preventive Maintenance ◽  
Historical Data ◽  
Pipeline System ◽  
Production Facility ◽  
Inspection Planning ◽  
Offshore Production ◽  
Considerable Portion ◽  
Operating Company ◽  
Production Facilities

The flange inspection associated with piping on offshore production facilities is a time-consuming activity as the flanges should physically be opened in order to perform close visual inspections. In order to sustain maintenance integrity, a number of inspections are allocated for a subsystem based on factors such as: condition of the medium flowing in the line, risk perception of the pipeline system, and the date of installation. Inspection teams recommend inspections based on the data, experience, and exposure to offshore production facilities, as well as the intuition and intentions of those individuals involved with inspection planning and with carrying out implementation during the preventive maintenance shutdowns. However, there is a tendency for the operating company representatives to raise queries with the contractor company representatives about the number of flanges to be opened during the preventive maintenance shutdown as flange inspection consumes a considerable portion of time and resources. Hence, it is vital to interpret sensibly the importance of recommending close visual inspections for flanges if the maintenance integrity is to be sustained. This study focuses on analyzing the historical data limited to flanges on flowlines over the last fifteen years. The final results provide a snapshot of the present status of the flanges of the production facility.

Reliability Analysis of Offshore Production Facilities Under Arctic Conditions Using Reliability Data From Other Areas

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Abbas Barabadi
Keyword(s):  
Reliability Analysis ◽  
High Stress ◽  
Arctic Region ◽  
Accelerated Failure Time Model ◽  
The Arctic ◽  
Reliability Data ◽  
Essential Information ◽  
Offshore Production ◽  
The Arctic Region ◽  
Production Facilities

The development of offshore energy resources involves highly complex and extensive technological processes. Reliability evaluation of offshore production facilities provides essential information in the design and operation phase. Historical reliability data play an important role in reliability analysis, and as such data reflect the effect of influencing factors that production facilities have experienced during their life cycle. Due to there being less offshore activity in the Arctic region compared with other areas, there is a lack of data and little experience available regarding operational equipment. In contrast to the Arctic region, oil and gas companies have a lot of experience and information related to the design and operation of offshore production facilities in the other parts of the world. Using this type of data and information, collected from similar systems but under different operational conditions, in design processes for the Arctic region may lead to incorrect design. This may increase health, safety, and environmental (HSE) risk or operating and maintenance costs. This paper develops a methodology for the application of the accelerated failure time model (AFT) to predict the reliability of equipment to be used in the Arctic region based on the available data. In the methodology used here, the available data is assumed to reflect the behavior of the equipment under low stress conditions, and using the AFT models the reliability of equipment in the Arctic environment, which represents high stress, is predicted. An illustrative example is used to demonstrate how the methodology can be applied in a real case.

An Integrated Approach to Welding, AUT and ECA for Pipeline Construction

2014 ◽  
Author(s):  
David Horsley ◽  
Jing Ma ◽  
Jan van der Ent ◽  
Casper Wassink ◽  
Martin Fingerhut
Keyword(s):  
Integrated Approach ◽  
Final Outcome ◽  
Critical Element ◽  
Unified Approach ◽  
Acceptance Criteria ◽  
Pipeline Construction ◽  
Girth Welds ◽  
Design Options ◽  
The Impact ◽  
Welding Productivity

An integrated approach for the development of welding, inspection, and alternative weld flaw acceptance criteria, as used for girth welds during pipeline construction is presented. Welding is typically the pace limiting step during pipeline construction and is critical element of pipeline integrity. As such it is vital that it be completed efficiently and with high quality. Each of these three elements is vitally important to welding productivity and quality. At the core of the approach is the coordination of the three elements such that they are developed in concert. By this coordinated effort, all design options are considered leading to optimization of the final outcome. The approach is described by providing an example alternative weld flaw acceptance criteria, and giving the logic pertaining to choices of welding setup, AUT setup, the standard used for design and construction, and the impact of choices within these three elements on the final outcome. The paper illustrates the importance of a unified approach on weld productivity and quality.

scholarly journals Component-level Performance-based Seismic Assessment and Design Approach for Concrete Moment Frames

2016 ◽  
Vol 10 (1) ◽  
pp. 25-39
Author(s):  
Zhou Xinxian ◽  
Han Xiaolei ◽  
Ji Jing ◽  
Qi Yongle ◽  
Hang Chao
Keyword(s):  
Performance Indicator ◽  
Seismic Assessment ◽  
Performance Level ◽  
Statistical Distribution ◽  
Structural Performance ◽  
Structural Components ◽  
Moment Frames ◽  
Acceptance Criteria ◽  
Performance Levels ◽  
Critical Components

To solve the conservatism of acceptance criteria in ASCE/SEI 41 provisions, a new concept of component performance is put forward and an alternative method based on the statistical distribution of component performance levels to evaluate structural performance level is proposed. Independent component performance levels are redefined in detail and component performance indicator limits are developed, which are different from acceptance criteria for integral target performance level of entire building proposed by ASCE standards. Structural components are classified into critical components and general components. The relationship between structural performance levels and the statistical distribution of component performance levels, including performance levels of critical components, general components and non-structural components, is proposed. A framework for applying this method will be discussed in detailand implemented to a seven-story moment frame. It is concluded that this new evaluation method is simple and meaningful for performance-based seismic assessment and design.

Damage to offshore production facilities by corrosive microbial biofilms

2018 ◽  
Vol 102 (6) ◽  
pp. 2525-2533 ◽  
Author(s):  
Adrien Vigneron ◽  
Ian M. Head ◽  
Nicolas Tsesmetzis
Keyword(s):  
Microbial Biofilms ◽  
Offshore Production ◽  
Production Facilities

Selective inspection planning with ageing forecast for sewer types

2002 ◽  
Vol 46 (6-7) ◽  
pp. 389-396 ◽  
Author(s):  
R. Baur ◽  
R. Herz
Keyword(s):  
Environmental Risks ◽  
Small Sample ◽  
Storm Water ◽  
Actual Condition ◽  
Inspection Planning ◽  
Transition Functions ◽  
Sewer Network ◽  
Different Types ◽  
Sewer Rehabilitation ◽  
Water Profile

Investments in sewer rehabilitation must be based on inspection and evaluation of sewer conditions with respect to the severity of sewer damage and to environmental risks. This paper deals with the problems of forecasting the condition of sewers in a network from a small sample of inspected sewers. Transition functions from one into the next poorer condition class, which were empirically derived from this sample, are used to forecast the condition of sewers. By the same procedure, transition functions were subsequently calibrated for sub-samples of different types of sewers. With these transition functions, the most probable date of entering a critical condition class can be forecast from sewer characteristics, such as material, period of construction, location, use for waste and/or storm water, profile, diameter and gradient. Results are shown for the estimates about the actual condition of the Dresden sewer network and its deterioration in case of doing nothing about it. A procedure is proposed for scheduling the inspection dates for sewers which have not yet been inspected and for those which have been inspected before.

Assessing Lifecycle Value Using Object-Based Modeling by Incorporating Excess and Changeability

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
Daniel Long ◽  
Scott Ferguson
Keyword(s):  
System Level ◽  
Change Propagation ◽  
Processing Unit ◽  
Component Level ◽  
Desktop Computer ◽  
Central Processing ◽  
Generic Modeling ◽  
Supply Capacity ◽  
Uncertain Future ◽  
Decision Based Design

Abstract Prior research suggests that excess (purposeful inclusion of margin beyond what is required for known system uncertainties) can limit change propagation and reduce system modifications. Reducing change costs increases system flexibility, permitting adaptions that satisfy uncertain future requirements. The benefits of excess, however, must be traded against higher costs of the initial system and likely performance decreases. Assessing the benefits and costs of excess requires evaluating what forms, locations, and magnitudes of excess inclusion are optimal. This paper improves the state-of-the-art in two ways. First, prior research has generally assessed excess in system-level properties (aggregating component properties into a single metric). The approach presented in this paper extends excess assessment to the component level so that the effects of excess on change propagation may be explicitly captured. Second, this approach holistically assesses the value of excess by evaluating both its costs and benefits. The approach borrows from Decision-Based Design and Model Based System Engineering (MBSE) in creating a generic modeling method capable of excess valuation. A desktop computer example is used for demonstrating how excess is valued in a system and the potential gains associated with excess inclusion when mining cryptocurrency. A single component optimization of the power supply capacity for the desktop is assessed to be 750 W, which balances the initial cost against the future flexibility. A system-level optimization then demonstrates the identification of critical change propagation pathways and illuminates both where and how excess may be included to inhibit change propagation. This key component was identified as the motherboard-central processing unit (CPU) slot in the tested systems.

scholarly journals A component-level methodology to evaluate the seismic repair costs of infills and services for Italian RC buildings

2020 ◽  
Vol 18 (14) ◽  
pp. 6533-6570 ◽  
Author(s):  
Maria Teresa De Risi ◽  
Carlo Del Gaudio ◽  
Gerardo Mario Verderame
Keyword(s):  
Large Scale ◽  
Residential Buildings ◽  
Structural Components ◽  
Rc Buildings ◽  
Component Level ◽  
Building Stock ◽  
Damage Level ◽  
Repair Costs ◽  
Electric Equipment

Abstract The reliable estimation of seismic losses due to damage to buildings is paramount for the post-emergency management and the planning of recovery activities. For residential reinforced concrete (RC) infilled buildings, a significant role in the computation of seismic loss is played by non-structural components, above all infills, partitions and services, as shown in past earthquakes. In this work, a component-based methodology is proposed to assess seismic losses for residential RC buildings in Mediterranean region. The attention is focused on the repairing activities for masonry infills (typical enclosure or partitions elements in Italian and Mediterranean RC buildings), and for services (plumbing systems, electric equipment, floor/wall tiles…), commonly enclosed within the infill panels for the considered building typology. The described methodology can be used starting from the expected damage level to infills and partitions. It adopts given repair unit costs at different damage states of infills. The loss estimation methodology has been, first, validated by comparing predicted and actual repair costs for specific case-study buildings damaged by L’Aquila (Italy) 2009 earthquake. Then, the methodology has been applied to a wide dataset of RC buildings (about 2500 residential buildings) damaged by L’Aquila earthquake available from the literature, to show its possible application at a large-scale level. A good agreement between observed and predicted costs is obtained both for specific case-study buildings and for the wider building stock, especially when damage to structural components is very limited.

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