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All Journal Journal of Materials Exploration and Findings (JMEF) Malcom: Indonesian Journal of Machine Learning and Computer Science Jurnal Indonesia Sosial Teknologi
Mahendra, Mirza
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Computer Science & IT Economics, Econometrics & Finance Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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Journal : Journal of Materials Exploration and Findings (JMEF)

 1 
STRUCTURAL RISK-BASED UNDERWATER INSPECTION (RBUI) AS A COST REDUCTION OF FIELD’s END OF PRODUCTION LIFE Putra, Ivan Fitrian; Soedarsono, Johny Wahyuadi; Mahendra, Mirza; Haidir, Yuki; Purnawarman, Faisal Dwiyana; Sukirna, Iwan; Hernowo, Widi
Journal of Materials Exploration and Findings Vol. 1, No. 2
Publisher : UI Scholars Hub

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Abstract

Mubadala Petroleum operates offshore platforms in a southern Makassar Straits that needs to be periodically inspected. The cost for the inspection is massive due to the high cost of mobilization and demobilization of vessels including crew and equipment. In response of a new approach to reduce cost, a Risk-Based Underwater Inspection (RBUI) methodology is developed. This RBUI purpose is to reduce the inspection interval of the offshore platform, from every 2 years to a longer period[1]. There are existing RBUI methodologies, which are already developed and implemented in other companies[5]. Purpose of this paper is to develop further detailed and more accurate RBUI methodology based on data analysis and the agile development method. Offshore platforms condition is dynamic and always changing from time to time. This methodology uses offshore platform design and condition data, including inspection data. All collected inspection data of offshore platform conditions will produce an accurate risk register of the platform. Thus, accurate risk register will give the best inspection interval time, considering its safety and economical benefit. From the RBUI analysis using this method, inspection interval can be deferred from 2 (two) years to range of 4-9 years, depending on the condition and risk of the platform. The operating cost of each platform also reduced up to US$ 670,737 per year.
Structural Integrity Analysis of the Rig Mast Following Repair of Two Diagonal Braces in the Upper Mast Section Padmodwiputra, Rendhatya; Soedarsono, Johny Wahyuadi; Mahendra, Mirza; Satria, Bambang Eka; Arif, Chandra; Suarthana, Eka Juni
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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During a move to the new drilling location, two braces of the upper mast section on a 550 HP oil and gas rig was damaged. When damage is discovered, the rig operating company should conduct a risk analysis related to the damage using the standard used to determine rejection criteria and follow-up repairs. The strength of the rig mast is calculated using Finite Element Analysis (FEA) with initial conditions (before damage occurs) where all braces are installed and extreme conditions where neither brace is repaired. The calculation results are then used to assess the risk of reducing the rig mast strength. The results of the integrity analysis will show FEA of rig mast and the distribution pattern of stress ratio values, which is the ratio between the stress that arises and the allowable stress of the material on the mast parts due to loading.
Co-Authors Arif, Chandra Badrul Munir, Badrul Deni Ferdian Haidir, Yuki Hernowo, Widi Johny Wahyuadi Soedarsono NURBAYANAH, SITI Padmodwiputra, Rendhatya Purboyo, Dipo Wirarchi Purnawarman, Faisal Dwiyana Putra, Ivan Fitrian Satria, Bambang Eka Soedarsono, Johny W. Suarthana, Eka Juni Sukirna, Iwan Wicaksana, Satya