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All Journal FLYWHEEL : Jurnal Teknik Mesin Untirta Jurnal Rekayasa Mesin
Suprayogi, Dedy Triawan
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Designing Size and Stack Number of Fuel Cell Urban Vehicle Nazwa, Intan; Satria, Dhimas; Jannah, Miftahul; Listijorini, Erny; Setiawan, Ipick; Pinem, Mekro Permana; Suprayogi, Dedy Triawan; Kanani, Nufus; Demustila, Harly
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 10, No 1 (2024): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v10i1.25506

Abstract

A fuel cell converts the energy in the chemical reaction of a continuously supplied fuel and its oxidizing agent into electrical energy. Fuel cells are used in various industries, including the automotive industry. In this context, fuel cell electric vehicles (FCEVs) have emerged as a promising alternative that offers zero emissions and competitive performance. This work was conducted to obtain a fuel cell design and determine the fuel cell modeling that suits the needs of FCEVs. The Pahl and Beitz method with QFD is used. It was found that the type of fuel cell used is PEMFC (Proton Exchange Membrane Fuel Cell) with platinum electrode material, and the fuel used is hydrogen on a small scale. Overall, fuel cell dimensions were 175 x 259 x 175 mm, and the number of fuel cell stacks that can be arranged is 35. With this geometry, the factor of safety value obtained at the stack fuel cell is 26, and at the end plate fuel cell 2.4, this value indicates that the PEMFC design is safe. Then, the output voltage is 50.55 V, and the output current is 25.27 A, so the power generated is 1.277 kW.
Evaluation of Burst Pressure on API X52 Pipes: Validation of Predictive Models via Full-Scale Experimental Data Setiawan, Teddy; Suprayogi, Dedy Triawan; Wahyudi, Hadi
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7209

Abstract

Ensuring the operational safety of steel pipelines depends heavily on understanding their failure points, or burst pressure. While various mathematical models are widely used in engineering practice, their accuracy for specific grades like API X52 often lacks robust field validation, as these models are essentially simplifications of complex real-world conditions. This study bridges this gap by evaluating the predictive accuracy of five major models-barlow, Von Mises, Zhu-Leis, API RP 1111 and DNV-OS-F101 against data obtained from a full-scale hydrostatic burst test. Using a pipe specimen with a 12 inch diameter and 11.13 mm wall thickness, the experimental result identified the actual burst pressure at 5,400 psi. comparative analysis revealed that the Barlow equation provided the highest accuracy with a relative error of only 4.12%, followed by the semi-empirical Zhu-Leis solution with a 6.97% deviation. Conversely, API RP 1111 method was found to be highly conservative by showing 17.24% deviation, which underscores its role as a safe design limit rather than a predictor of actual failure. These findings offer practitioners confidence that for thin-walled API X52 pipes with a diameter to thickness ratio of approximately 29, the Barlow model remains a practical and reliable reference for assessing pipeline integrity and estimating safe by operating limits.
Co-Authors Dhimas Satria Harly Demustila Jannah, Miftahul Kanani, Nufus Listijorini, Erny Nazwa, Intan Pinem, Mekro Permana Setiawan, Ipick Setiawan, Teddy Wahyudi, Hadi