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All Journal Jurnal Polimesin Evrimata: Journal of Mechanical Engineering
Ratna Monasari
State Polytechnic of Malang
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Location Class Category and Pipe Wall Thickness on Risk Level Onshore Pipeline Oil Zakki Fuadi Emzain; Makhmudul Fikri; Satworo Adiwidodo; Ratna Monasari; Talifatim Machfuroh
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4082

Abstract

Pipelines are essential infrastructure for efficient oil and gas production operation, necessitating their continuous and reliable functionality in all locations and circumstances. Nevertheless, the pipeline can fail during operation due to multiple detrimental variables. This study evaluated the impact of the location classification category and pipe wall thickness on the risk level of onshore pipelines. The risk assessment method employed was a semiquantitative approach derived from the reference "Pipeline Risk Management Manual" by W. Kent Muhlbauer. The distributing crude oil pipeline, which spans a distance of 18 kilometers and has a diameter of 6 inches, was evaluated. The evaluation yielded a pipeline relative risk score of 0.91, classifying the pipeline as belonging to risk category 1B. Following this, the assessment findings were analyzed for all 36 pipeline segments, classifying 26 segments in the 1B category and the remaining 10 segments in the 2B category. From the analysis results, the difference between the two risk categories was produced by differences in location class categories, where the pipeline segment in location class 1 creates a 1B risk category; meanwhile, class 3 produces a 2B risk category. Furthermore, a pipeline with a wall thickness of 5.156 inches is associated with a risk score of 0.81, but a wall thickness of 4.1 inches yields a score of 1.41. These results indicate that the location class category and pipe wall thickness significantly impact the risk of onshore pipelines.
The Effect of Variations in Induction Tube Volume and Membrane Thickness on the Performance of A 150 CC 2-Stroke Motorcycle gusti gusti; Ratna Monasari; Hanif Firdaus
Evrimata: Journal of Mechanical Engineering Vol. 02 No. 01, 2025
Publisher : PT. ELSHAD TECHNOLOGY INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70822/evrmata.vi.109

Abstract

One of the efforts to improve the performance of a gasoline motor with a 2-stroke system is to make some modifications to the combustion system components. By changing the volume of the induction tube and the thickness of the membrane the performance of a 2-stroke gasoline motor can be improved from standard conditions. The purpose of this study is to understand how changes in the volume of the induction tube affect the performance of a 2-stroke motor engine with a capacity of 150 cc, with the aim of restoring optimal performance to the motor. This study uses an experimental method on how the effect of variations in induction tube volume and membrane thickness on gasoline motor performance. The test variable in the study is to compare 3 induction tube volumes and 2 membrane thicknesses to the resulting engine performance. Tests were carried out on a 150cc 2-stroke gasoline motor using a chassis dynamometer as a tool to see the performance of the test engine and a gas analyzer as a tool to measure the level of exhaust emissions produced. From the tests that have been carried out, it shows that the volume of the induction tube and the thickness of the membrane have an influence on the performance of a 150 cc 2-stroke gasoline motor. The highest torque is obtained on a 300cc induction tube with a membrane thickness of 0.45 mm of 19.60 Nm at 9,000 rpm. While for fuel consumption using the calculation of specific fuel consumption (SFC) obtained results of 0.08 g / kW.h. for exhaust emissions on HC produced at 2452 ppm and 0.97% on CO gas.
Co-Authors gusti gusti Hanif Firdaus Makhmudul Fikri Satworo Adiwidodo Talifatim Machfuroh Zakki Fuadi Emzain