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All Journal Bulletin of Engineering Science, Technology and Industry
Muhamad Habibi
Institut Teknologi PLN
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering

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TKDN SELF-ASSESSMENT OF REVERSE-ENGINEERED COAL PIPE FABRICATION AT PLN PUSHARLIS: A CASE STUDY Elviena Farizka; Muhamad Habibi; Heryanto
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September - ON PROGESS
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Dependence on imported spare parts in coal-fired power plants increases procurement cost and delivery time, while critical components such as the Coal Pipe are exposed to abrasive wear and elevated operating temperatures. This study evaluates the Domestic Component Level (Tingkat Komponen Dalam Negeri/TKDN) of an SS400 Coal Pipe fabricated by PLN Pusharlis through reverse engineering. A case-study self-assessment was conducted by integrating engineering documents, manufacturing flow, shop drawings, bill of materials, procurement realization, labor, and factory-overhead data with the cost-classification approach required by Indonesian Ministry of Industry Regulation No. 16/M-IND/PER/2/2011. The fabrication approach references ASTM G65 for abrasion-related material considerations and ASME Section IX for welding qualification. The detailed production-cost structure totals IDR 39,571,487.44, consisting of IDR 24,551,412.26 domestic components and IDR 15,020,075.18 foreign components, resulting in a TKDN value of 62.04%. The foreign share is concentrated mainly in primary raw materials, whereas direct labor, indirect labor, and most overhead are domestically sourced. The case demonstrates that reverse engineering can support import substitution while providing an auditable basis for domestic-content accountability
A CASE STUDY ON THE TECHNICAL FEASIBILITY OF FABRICATING A 700-BAR PRESSURE VESSEL USING THE DESIGN-BY-ANALYSIS (DBA) APPROACH AT PT PLN (PERSERO) Yanurarzaqa Ghiffari; Zulfikar Manggau; Muhamad Habibi
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September - ON PROGESS
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Green-hydrogen deployment requires storage vessels capable of sustaining very high pressure while maintaining structural integrity and manufacturability. This study evaluates the technical feasibility of manufacturing a Type II hydrogen pressure vessel at PT PLN (Persero) PUSHARLIS using a Design-by-Analysis approach supported by finite element analysis. The study integrates engineering standards, material screening, workshop observations, design calculations, ANSYS simulation, manufacturing review, and hydrostatic-test planning. The proposed vessel uses an AISI 4130 steel liner with a 49 mm wall and a 14 mm composite hoop-wrapping layer under a 70 MPa (700 bar) internal pressure. Simulation produced a maximum von Mises stress of 381.75 MPa, below the 1,186 MPa yield strength adopted for the liner, with a minimum safety factor of approximately 3.05. The hydrostatic-test scheme uses 910 barg, equivalent to 1.3 times the design pressure. Local ASTM A36 can support prototype manufacturing-process development, but its lower strength makes it unsuitable for long-term high-pressure hydrogen storage. The results indicate a feasible domestic manufacturing pathway provided that high-pressure code qualification, material compatibility, testing capability, and quality assurance are strengthened.
Co-Authors Elviena Farizka Heryanto Yanurarzaqa Ghiffari Zulfikar Manggau