Optimised Fatigue and Reliability RBI Program for Requalification, Life Extension and Integrity Management of Offshore Structure

The GUPCO offshore structure management system was developed as a part of an integrated infrastructure management system. This paper presents a case study of providing an integrity management system for inspection, evaluation and repair of the fixed offshore platforms in Gulf of Suez. The management system procedure is presented focusing on the first step for defining the highly risky weight to the lower risky weight structure based on API criteria for assessment of the existing structures. The risk analysis methodology for developing design and assessment criteria for fixed offshore structure based on consequence of failure is illustrated. In our case study the assessment method is applied for a number of fixed offshore structures. The above methodology is performed after theoretical assessment and then verifying by using ROV subsea inspection for the fixed offshore structure. Comparison between the actual structure performance and the predicting risk assessment for the structure from the model will be studied. The overall management system will be illustrated in scope of predictive maintenance philosophy and reliability for all offshore structures.

Download Full-text

Developing the Structural Integrity Management System for Ageing Fixed Offshore Oil Platforms in Indonesia

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.862.265 ◽

2017 ◽

Vol 862 ◽

pp. 265-270

Author(s):

Raditya Danu Riyanto ◽

Murdjito

Keyword(s):

Management System ◽

Structural Integrity ◽

Offshore Structures ◽

Offshore Platforms ◽

Offshore Structure ◽

Element Analysis ◽

East Kalimantan ◽

Ranking Criteria ◽

Life Years ◽

Integrity Management

Offshore structure, particularly fixed offshore structures, should be kept in the performance for the fit-for-purpose condition during their operating lifetime. For fixed offshore structures that exceed their designated life years, the proper Structural Integrity Management System (SIMS) should be developed and applied. Despite the fixed offshore platforms have their service life, there are still platforms that continue to operate exceeding their service lifetime. These ageing platforms should be taken care thoroughly to avoid the consequences that could take casualties. This paper will propose the proper initiation of SIMS development for ageing fixed offshore platforms in Indonesia, by taking an example at Bekapai Field Platforms in East Kalimantan. Using HAZID technique and several ranking criteria, the platforms are assessed and ranked. Platforms that categorized in critical condition are grouped based on similarities in geometry and function. The highest rank is analyzed in computer Finite Element Analysis (FEA) Software with modification based on latest inspection result. This method is proven to be a proper method to be used as a maintenance program for ageing fixed offshore platforms in Indonesia.

Download Full-text

Integrity Management for Steel Catenary Risers With Design Life of 30 Years

Volume 4: Pipelines, Risers, and Subsea Systems ◽

10.1115/omae2020-18065 ◽

2020 ◽

Author(s):

Hao Song ◽

Chenteh Alan Yu ◽

Yongming Cheng ◽

Jing Hou

Keyword(s):

Measurement Data ◽

Management Program ◽

Gas Production ◽

Digital Model ◽

Life Extension ◽

Critical Element ◽

Steel Catenary Riser ◽

Integrity Assessment ◽

Design Life ◽

Integrity Management

Abstract The riser is a critical element in a subsea production system for transporting hydrocarbons from the seafloor to the surface. The track record of existing riser systems worldwide has shown that risers tend to be designed conservatively to accommodate dynamic loads, strength and fatigue requirements, and corrosion/erosion provision needs. Among all the riser types, the steel catenary riser (SCR) is the most installed riser configuration for deepwater oil and gas production worldwide in the last two decades. This is mainly because of their simple configuration and relatively low manufacturing and installation cost. As riser technology advances, SCRs are designed to tackle more challenging environments and longer service lives. For the riser life extension applications, regulatory bodies prefer riser operations to be managed through an integrity management program, demonstrating that a robust framework with detailed records on the conditions of the risers is in place. This paper studies an integrity management program for SCRs with a 30-year design life in a harsh environment. The planned riser integrity management program is based on successful industry practice and the newly published riser integrity management standard API RP 2RIM [4]. It starts with a review of the riser design basis and as-built data, continuing with key field data measurement and production fluid sampling. A digital model, continuously calibrated with the measured data, is established to assess the integrity of the riser system. Key physical quantities are selected to monitor the structural health of the SCRs, including vessel motion measurement, measurement of SCR top hang-off angles and tensions, and full water column current measurement. The relationship between the measurement data and the riser strength and fatigue performance is established. Details of the riser integrity assessment in a digital model utilizing the measurement data are presented. The implemented proposed riser integrity management program is expected to provide a more focused and efficient method with a higher level of confidence in operating the SCRs during the design life and potentially beyond.

Download Full-text

Implementation of Advanced Offshore Structure Integrity Management based on API RP2SIM in Medco E&P Offshore

Proc. Indon. Petrol. Assoc., Digital Technical Conference, 2020 ◽

10.29118/ipa20-f-172 ◽

2020 ◽

Author(s):

E. Islami

Keyword(s):

Structural Integrity ◽

Good Practice ◽

General Information ◽

Offshore Structure ◽

Potential Cost ◽

Integrity Management ◽

Advanced Analysis ◽

Inspection Data ◽

Data Update ◽

Reserve Strength

The structural integrity management (SIM) is important for the safe operation and maintenance of offshore fixed platform installation in accordance with the objectives set out in the Asset & Operating Integrity Philosophy. A Structural Integrity Program as part of the SIM is required as an ongoing process to ensure fitness-for-purpose of an offshore structure. Medco E&P developed the SIM system based on API RP2SIM in year of 2014 and has been successfully implementing it for the last 6 years. Based on this system, the interval of underwater inspection has been lengthened from every 2 years (time based inspection) into 4-10 years interval depend on the platform criticality. The potential cost saving of 70% is obtained as a result of implementation the underwater inspection for 10 years period based on inspection practices recommended in API RP 2SIM. The implementation of SIM process based on API RP 2SIM includes managing data, evaluation, strategy and program, the continuous improvement efforts and lesson learned. Medco E&P has implemented an advanced SIM program by determining the underwater inspection program based on risk based underwater inspection and consistently revisit and review the methodology; conduct the advanced analysis for reserve strength ratio; manage platform requalification; follow-up underwater inspection and repair; develop the integrated database system and the platform healthiness dashboard. The integrated database SIM System established a good practice for managing data record, data trending and data update since the system itself contains the platform of general information such as; the inspection data, inspection plan, structural analysis record, change record, reference document as well as the reporting tools. This dashboard is a combined status of initiatives, programs, implementation and evaluations that enables the integrity status can be accessed by management or other groups in the Company to promote effective communication and basis for decision making.

Download Full-text

Integrity Management and Life Extension for a CALM Buoy Oil Export Terminal

Volume 3: Operations, Monitoring and Maintenance; Materials and Joining ◽

10.1115/ipc2016-64495 ◽

2016 ◽

Author(s):

Robert B. Gordon ◽

Juan Carlos Ruiz-Rico ◽

Michiel Peter Hein Brongers ◽

Julian Gomez

Keyword(s):

Failure Modes ◽

State Of The Art ◽

Life Extension ◽

Remaining Life ◽

Integrity Assessment ◽

Design Life ◽

Oil Export ◽

Integrity Management ◽

Inspection And Maintenance ◽

Future Risk

This paper applies state-of-the-art integrity management and life extension methodologies to address degradation and failure modes specific to CALM buoy export terminals. The main objectives are to (1) classify the components of the export terminal according to their criticality, (2) establish risk-based inspection and maintenance plans to reduce or mitigate risk to acceptable levels and (3) assess remaining life. The method is applied to a CALM buoy operating off the coast of Colombia. This buoy serves as the oil export terminal for all crude oil transmitted by the Ocensa pipeline, which has a capacity of 560 kBPD or around 60% of total Colombia oil production. The buoy is nearing the end of its design life, and options for life extension have been investigated based on an integrity assessment of the current condition of the equipment. As part of the assessment, detailed plans for future Risk Based Inspections (RBI) and Mitigation, Intervention, and Repair (MIR) have been developed.

Download Full-text