SIMS fundamental process as per API RP2SIM consists of 4 primary elements:
data, evaluation, strategy, and program.
Figure 1 SIMS Fundamental Process[1]
2.1 SIMS Cycle and Implementation
SIMS provide framework for inspection planning, maintenance, and repair for group of platforms. This process is developed into integrity management cycle:
Plan, Do, Check, Action (PDCA) cycle as basis to establish structure integrity program. PHE WMO SIMS Guideline has been developed as basic guidance to implement the system and to provide role and responsibilities for each parties involved in the process.
Figure 2 SIMS Operational Process
The structural component covered in SIMS for fixed offshore platform divided into 2 (two) main parts; substructure (jacket, including vertical, horizontal, and diagonal bracing) and upper structure/topside (deck girder, deck leg, trusses, and other personnel safety structure). Each of structural components is labeled with a sequence of unique number and registered in the database. Inspection, Maintenance, and Repair (IMR) program will be arranged and recorded based on this system.
The Plan cycle include IMR Strategy and Program Plan. Inspection scope of work will be produced by structural integrity engineer. Structural inspection program divided into above water (AWPI) and under water (UWPI). AWPI is conducted time-based while UWPI is carried out based on Risk-Based Underwater Inspection (RBUI) with fixed schedule until year 2030. Inspection Program also has been determined (Level I, II, or III) in RBUI schedule and methodology.
The Do cycle consist of the execution of Above Water and Under Water Inspection. Procedure for both inspections have been developed to make sure that
the execution is in accordance with regulations and company requirements and also to make sure that the latest condition of the platform is well captured.
The Check cycle contains anomaly assessment and produce recommendation for anomaly findings. After data from inspection is obtained, it is need to be assessed by structural integrity engineer to produce recommendation for the structural component, is it fit for service, need to be monitored in the next planned inspection, or need to be repaired. A guideline has been produced to determine anomaly limit for each type of inspection. When major repair is needed, it is necessary to conduct structural engineering assessment based on applicable code (API RP2A WSD [2]) before execution to check platform structural capacity.
The Action cycle covered the follow up action for the recommendation produced in anomaly assessment. It could be further detailed inspection such as MPI, detailed engineering assessment, or corrective action/repair. Repair scope of work/work package will be send to execution team with applicable due date to measure performance (scope vs actual).
Figure 3 SIMS Work Flow
The product of this system is structural integrity status of the asset. Different from piping/pipeline which have an integrity status for each line number, structure element of a platform is a unity of various structural major and minor components that worked simultaneously to withstand given load, including equipment, environmental, and live load as per design basis. A method has been developed to determine structural integrity status of a platform with scoring system combining platform condition based on latest condition of the platform based on inspection result and platform structural design analysis. A single dimensional mathematical approach is used to combine all parameter into a single process of analysis by using weighting score for each parameter based on professional judgment by structure integrity specialist. There will be 4 (four) general condition of a platform; Good, Fair, Poor, or Bad based on previous scoring system mentioned. Integrity statements for each platform will be produced annually consist of platform general information, integrity status, and recommendation related to platform critical anomalies.
2.2 SIMS Web Database Management System
All of SIMS cycle mentioned above is monitored, maintained, and recorded in centralized online database management system. The objectives are to make sure that the assets are registered and program including inspection, assessment, maintenance and repair activities are monitored and completed on schedule. All parties involved in SIMS cycle will have their own role and responsibilities based on organization chart and all function from top management level to engineer level could take advantage from this web database system to support their role to maintain asset integrity.
Figure 4 AIMS Database Management System Data Hierarchy and Target User
AIMS database for structure generally divided into 5 (five) section as per follows:
a. Asset Register (platform data from original design and modification record including drawing, analysis, and design basis; and also environmental data required for analysis)
b. Inspection (Plan, Do, and Performance Measurement; consist of inspection scope of work, inspection result and history, and summary of inspection execution for both above and under water)
c. Assessment (Integrity Assessment consist of inspection result analysis to provide recommendation; and Engineering Assessment which provide structural analysis result)
d. Corrective Action (Plan, Do, and Performance Measurement; consist of corrective action scope/package and execution program monitoring) e. Executive Summary (summary of assets information and integrity status
mentioned in integrity statement for each platform).
AIMS Database also contains certification modules (SKKP) document and validity for each platform and also RBUI schedule and methodology.
Figure 5 AIMS Database Management System Data Hierarchy and Target User