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All Journal METANA IPTEK Journal of Proceedings Series AGREGAT Metta : Jurnal Ilmu Multidisiplin Journal of Safety, Health, and Environmental Engineering Jurnal Cakrawala Maritim Jurnal Teknologi Maritim Jurnal Cakrawala Maritim PROCEEDINGS CONFERENCE ON DESIGN AND MANUFACTURE AND ITS APPLICATION
Mochammad Choirul Rizal
Politeknik Perkapalan Negeri Surabaya
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Efisiensi Biaya dan Penjadwalan Proyek melalui Pendekatan Critical Path Method (Studi Kasus Pembuatan dan Pemasangan 1 Unit Standart Gilingan IV) Eunike Endah Wulandari; Renanda Nia Rachmadita; Mochammad Choirul Rizal
Proceedings Conference On Design Manufacture Engineering And Its Application Vol 2 No 1 (2018): Conference on Design and Manufacture and Its Aplication
Publisher : Proceedings Conference On Design Manufacture Engineering And Its Application

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Manufacturing companies in Indonesia generally implement project management. Thepurpose of implementing project management is to control the project being undertaken by thecompany. In addition, the purpose of implementing project management at the company is tominimize the delay in the process of project work.To be able to determine the optimal time and cost efficient on a project, required a method. TheCritical Path Method (CPM) method is one of the methods that can be used to optimize the timeneeded to complete the project in an efficient cost.The result of CPM method implementation on the project of making and installing 1 unit of grind millIV, in order to get optimal time with efficient cost is done by adding the amount of labor and overtimehours. With the addition of labor and overtime, the direct costs incurred increase. The direct costsincurred for additional employment amounted to Rp 1,755,418,984.00, while the direct costs incurredfor additional hours overtime amounted to Rp 2,614,578,401.00. From the calculation of such directcosts, it can be seen that it will be more efficient with the addition of the number of workers. After thatcalculation of slope cost, and got optimal time for project work is 219 days with total cost Rp5,860,789,447,32. Result of correlation and regression analysis, got value of influence of labor costto total cost is equal to 94,4% while machine cost effect to total cost is equal to 97,8%.
Analisis Struktur Railing Overhead Conveyor Septiani Lestari; Mohamad Hakam; Mochammad Choirul Rizal
Proceedings Conference On Design Manufacture Engineering And Its Application Vol 8 No 1 (2024): Proceedings Conference On Design Manufacture Engineering And Its Application
Publisher : Proceedings Conference On Design Manufacture Engineering And Its Application

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/cdma.v8i1.3105

Abstract

The manual material handling process has several disadvantages, including a large workforce and a relatively long time, which hinders the continuity of the next process. So material handling tools are needed in the form of overhead conveyors to simplify the material handling process. This research aims to analyze the strength and feasibility of optimal construction according to company needs. Concentrate on railing and support construction. Requirements data based on company requests with a load capacity of 200kg, track length of 75 m. The final conclusion is that ASTM A36 material is used which has high safety for the overhead conveyor railing construction. The results of the analysis of the railing and support construction show that the von Mises stress value in the construction is 73,85 MPa with a deflection value of 9.08 mm. Meanwhile, for the supports, the von Mises stress results were 5,53MPa and the deflection value was 0,14 mm. The accumulated stresses and deflections that occur in each planned construction, both from manual calculations and simulations, are declared safe, because the stress and deflection values ??that occur in the construction are below the permitted stress and deflection values.
SOSIALISASI MENGENAI ERGONOMI TERHADAP POSTUR KARYAWAN DAN PENGUKURAN LINGKUNGAN KERJA KONVEKSI SIMPATI, SIDOARJO Maharani, Aditya; Rizal, Mochammad Choirul; Kurniasih, Dewi; Cahyaningati, Desi; Ashari, Mochamad; Mahfudzi, Imam
Jurnal Cakrawala Maritim Vol. 8 No. 2 (2025): Jurnal Cakrawala Maritim
Publisher : P3M Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/jcm.v8i2.42

Abstract

Konveksi mempunyai peranan penting dalam mendukung tercukupinya kebutuhan sandang manusia. Akan tetapi, proses kerja di industri konveksi memiliki risiko keselamatan dan kesehatan terhadap pekerja. Hal ini berkaitan dengan aspek lingkungan kerja dan ergonomi. Aspek tersebut kadang diabaikan oleh beberapa pemilik perusahaan. Hasil survei menunjukkan bahwa Konveksi SIMPATI belum sepenuhnya menerapkan aspek tersebut dalam pekerjaannya. Dilakukannya pengabdian masyarakat ini bertujuan untuk memberikan edukasi dan pemahaman yang relevan terkait postur kerja dan aspek ergonomi lainnya. Selain itu juga dilakukan pengukuran terkait lingkungan kerja bertujuan untuk rekomendasi diterapkan pada area kerja Konveksi SIMPATI. Dengan adanya kegiatan ini dapat meningkatkan pengetahuan pekerja mengenai beberapa faktor bahaya ergonomi serta mencegah adanya gangguan penyakit akibat kerja berdasarkan hasil pengukuran lingkungan kerja dari faktor pencahayaan dan kebisingan.
Pengujian Tripotassium Sitrat dan Asam Sitrat Sebagai Fire Retardant Pada Kain Gorden Kurniasih, Dewi; Ashari, Moch. Luqman; Maharani, Aditya; Santoso, Mardi; Cahyaningati, Desi; Rizal, Mochammad Choirul
Metta : Jurnal Ilmu Multidisiplin Vol. 5 No. 2 (2025)
Publisher : Jayapangus Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37329/metta.v5i2.3927

Abstract

Based on data from the Indonesian Police and Fire Department, the number of fire incidents is quite high and the most frequent fires are residential buildings. Therefore, it is necessary to conduct research related to materials that can inhibit the spread of fire. This research was conducted with the intention of determining the ability of Tripotassium Citrate in sweet potato skin and Citric Acid in inhibiting the spread of fire. The purpose of this study was to determine which material is more effective by testing and combining the dosage of each material. The method used was to conduct an experimental test on the combination of these materials in inhibiting the spread of fire. The aspects measured in this study were the mass loss and the area burned from each sample. The experimental results show that Tripotassium citrate has a function in slowing down the fire ignition stage with a mass loss ranging from 0.67 - 0.97 grams and a percentage of burned area ranging from 17.54% - 23.85%. While citric acid has a function in slowing down the fire growth stage with a mass loss ranging from 0.01 - 0.17 grams and a percentage of burned area ranging from 1.75% - 7.08%. The combination of the two materials produced results with a mass loss ranging from 0.2 - 0.8 grams and a percentage of burned area ranging from 4.27% - 14.04%. With these results, it can be concluded that Tripotassium Citrate and Citric Acid can be used as fire retardants.
Co-Authors Aang Wahidin Adhi Setiawan Adhi Setiawan Ahmad Erlan Afiuddin Alma Vita Sophia Anda Iviana Juniani Anggraini, Febby Dwi Melanny Arief Subekti Bagas Adhiwangsa Bella Naziel Iqmalia Berliana Azzah Ramadany Cahyaningati, Desi Cahyono, Luqman Denny Dermawan Dewi Kurniasih Eunike Endah Wulandari Fani Firmansyah Fitri Hardiyanti Gaguk Suhardjito Gigih Alam Pambudi Hera Widyastuti Imam Hambali Azhori Ira Anggraeni Lutfi Wicaksono Maharani, Aditya Mahfudzi, Imam Mardi Santoso Moch Luqman Ashari Mochamad Ashari Mochamad Luqman Ashari Mochamad Yusuf Santoso Mohamad Hakam Nora Amelia Novitrie Novi Eka Mayangsari Rafi Narariya Ramadhan Renanda Nia Rachmadita Ruddianto Ruddianto Septiani Lestari Styadhika, Falista Anggi Tanti Utami Dewi Tarikh Azis Ramadani Tasidalle, Fauziah Nadya Febrianty Tri Tiyasmihadi Ulfa, Ainun Ulifiya Ulvi Pri Astuti