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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Lomi Ga, Jonri
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Mechanical Engineering

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Evaluasi Penerapan Kesehatan Dan Keselamatan Kerja Di Bengkel Teknologi Mekanik Jurusan Teknik Mesin Politeknik Negeri Kupang Dengan Metode HIRADC Ratu, Desi Natalia; Tuati, Amros A.; Rerung, Oktavianus D.; Lomi Ga, Jonri; johanis, Alexius L.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.24262

Abstract

HIRADC (identification, hazard analysis, and risk control) is the application of controls used to systematically review processes or operations in a system. This research using HIRADC method, summarized in the form of transcripts, analyzed using research forms and risk assessment matrices to identify the hazards levels present in the mechanical technology workshop/laboratory, measurements taken to prevent accidents. Based on the interview results, it was found one accident. The questionnaire results showed the majority of respondents had a positive perception of safety and service quality, Over 70% stating that it was safe and of good quality. However, the frequency of service use was relatively low, with over 50% of respondents stating they had never used the service. Identification and evaluation revealed 1 High Risk, 6 Moderate Risks, and 1 Low Risk. Based on these results, they were categorized as 75% physical and 25% chemical. In addition to the results of technical, administrative, and PPE controls, the steps presented in this study include control measures and preventive actions that can be implemented to improve OSH aspects in the laboratory. Thus, workshop/laboratory managers can develop strategies to reduce risks and enhance user safety.
Analisa Hidrolis Sistem Irigasi Pertanian Lomi Ga, Jonri; Johanis, Alexius Leonardo; Zacharias, Jody Alfred; Nafi, Sulche Ifone; Liem, Ferdinand Nikson; Ginting, Almido Haryanto
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.25167

Abstract

The objective of research is to assess the uniformity of pressure and the effectiveness of water distribution among the irrigation nodes. The study models drip and sprinkler irrigation networks in an 11,500 m² agricultural field using a hydraulic modeling technique using EPANET 2.2 software. The number of non-flow nodes in each simulated area, the minimum-maximum discharge, and the average pressure are the primary parameters that are examined. The findings demonstrate that branch diameter, pipe length, and pipe network layout all have a substantial impact on flow rate and pressure distribution. While locations with longer pipe segments encounter pressure drops of up to 5–7 mH₂O at the downstream portion, areas with homogeneous pressure (8–10 mH₂O) demonstrate more steady and effective water distribution performance. It was discovered that the main causes of system efficiency reduction were frictional energy losses and small losses. To increase pressure uniformity, pump energy efficiency, and overall irrigation system reliability, technical suggestions are made to install pressure regulator valves (PRV), optimize pipe diameter, and conduct zoning operations.
Co-Authors Ginting, Almido Almido Haryanto Johanis, Alexius L. Johanis, Alexius Leonardo Liem, Ferdinand Nikson Nafi, Sulche Ifone Ratu, Desi Natalia Rerung, Oktavianus D. Tuati, Amros A. Zacharias, Jody Alfred