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Eriek Wahyu Restu Widodo
Politeknik Perkapalan Negeri Surabaya
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Analysis of the Effect of PWHT on the Corrosion Test of API 5L X65 Material in Submerged Arc Welding Kusminah, Imah Luluk; Anggara, Dika; Wardani, Dianita; Widodo, Eriek Wahyu Restu; Nafi, Maula; Handoko, Lukman; Djati, Anggoro Ludiro; Trianto, Ryo Andika
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.5828

Abstract

This research discusses the method of making distribution pipes using the Submerged Arc Welding (SAW) welding process, especially for pipes with spiral connections. The material used is API 5L X65. SAW pipes with spiral joints are more commonly used for low-pressure piping systems. However, in certain cases, the production of SAW pipes for Sour Service distribution requires special treatment. Sour Service pipes have a high level of corrosion and residual stress, so Post Weld Heat Treatment (PWHT) is required to prevent Hydrogen Induced Cracking (HIC). HIC occurs due to the absorption and accumulation of hydrogen gas in the metal, causing the formation and growth of cracks, which is also influenced by residual stress. PWHT is applied to reduce residual stress to reduce the risk of corrosion. PWHT is a process to change the structure of the weld metal by heating the metal at a certain temperature and time. This research shows that variations in PWHT temperature produce an average residual stress that is not much different with less difference than 2%, In corrosion testing with the HIC method shows crack evidence but is still satisfactory NACE MR0175 criteria for pipe PWHT temperature variation conditions.
Preheat and PWHT analysis of FCAW A573 grade 70 welds results of HT and NHT materials on hardness and microstructure Karim Al Amin, Mochammad; Zakaria, Abdul Majid; Bachtiar, Bachtiar; Rachman, Arif; Widodo, Eriek Wahyu Restu; Fauzi, Muhammad
Journal of Welding Technology Vol 6, No 1 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i1.5239

Abstract

Material A573 Grade 70 is one type of material used to manufacture pressure vessel shells or walls. The thickness of the shell depends on the required pressure design for production. In a case study on pressure vessel shell manufacturing, a thickness of 36 mm was used near the manhole. Due to the connection between the shell and the manhole, the material A573 Grade 70 in the shell was subjected to heat influence. The shell near the manhole will be connected to the rest of the shell using the same material, A573 Grade 70. Consequently, it was necessary to analyse the heat treatment for this material. The heat treatments used to determine the microstructure and hardness value were Preheat and Post Weld Heat Treatment (PWHT). Both types of heat treatments were employed. The preheat temperatures varied at 120°C, 150°C, and 200°C for each joint undergoing PWHT at 650°C with a holding time of 60 minutes, as well as for joints without PWHT. The microstructure of variations with preheat and PWHT exhibited finer grains compared to variations without PWHT. The highest recorded hardness value among the variations with PWHT was 209.89 HVN in the weld metal for the 150°C preheat variation. The highest recorded hardness value among the variations without PWHT was 235.07 HVN in the weld metal for the 200°C preheat variation
Maintenance Mesin Press untuk Mengoptimalkan Produktivitas Rumput Laut di Dusun Tanjungsari, Desa Kupang, Kecamatan Jabon, Kabupaten Sidoarjo Amrullah, Haidar Natsir; Widodo, Eriek Wahyu Restu; Santosa, Rabbani Budi; Wicaksono, Zaki; Ditya, Muhammad Haris
Jurnal Cakrawala Maritim Vol. 9 No. 1 (2026): Jurnal Cakrawala Maritim
Publisher : P3M Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/jcm.v9i1.81

Abstract

Rumput laut menjadi salah satu komoditas andalan bagi petani tambak selain komoditas perikanan. Jenis rumput laut yang dibudidayakan di wilayah Jabon adalah Gracilaria sp., yaitu jenis alga merah yang banyak ditemukan di kawasan tropis. Gracilaria termasuk dalam kelompok alga merah penghasil agar (agarofit). Hasil panen rumput laut dari tambak dalam jangka waktu satu bulan dapat mencapai sekitar 10 ton per bulan, yang dikelola oleh Koperasi Sumber Mulyo 5758. Permasalahan yang dihadapi saat ini adalah tidak adanya perawatan pada mesin press hidrolik untuk rumput laut. Hal ini disebabkan oleh kurangnya pemahaman pembudidaya mengenai tata cara perawatan mesin tersebut secara tepat. Oleh karena itu, diperlukan kegiatan pelatihan dan penyuluhan kepada masyarakat atau para pembudidaya. Melalui kegiatan pengabdian kepada masyarakat ini, diharapkan para pembudidaya di Dusun Tanjungsari memperoleh pengetahuan dan keterampilan dalam merawat mesin produksi rumput laut, sehingga umur pakai mesin dapat lebih panjang serta proses produksi rumput laut menjadi lebih efektif dan efisien.
Co-Authors A.A. Ketut Agung Cahyawan W Abda Abda Amang Kuswanto Amrullah, Haidar Natsir Andiana, Rocky Anggara, Dika Arif Rachman Augustino, Immanuel Freddy Ayu Setyowati, Vuri Bachtiar Bachtiar Bachtiar Desmas Arifianto Patriawan Dianita Wardani Dika Anggara Ditya, Muhammad Haris Djati, Anggoro Ludiro Firiambodo, Suthoni Yoga Habibi, Tsaaqif Haani Hery Irawan, Hery Ilham Khoirul Ibad Ilham Qiromi Karim Al Amin, Mochammad Kusminah, Imah Luluk Lukman Handoko M. Thoriq Wahyudi M. Wiji Santoso Ma'ruf, Buana Maula Nafi Mochammad Karim Al Amin Mohammad Yusuf Sulaiman Muhamad Ari Mukhlis Munir, Moh. Miftachul Mustaghfirin, Muhammad Anis Nisazarifa, Adristi Prastyawan, Rikat Eka Pratama Putra, Mochammad Yudha Aditya Priyambodo Nur Ardi Nugroho Purwanti, Endang Pudji Putera, Erwien Yuliansyah Qiromi, Ilham RR. Ella Evrita Hestiandari Sa'diyah, Rahmatus Santosa, Rabbani Budi Setyowati, Vuri Ayu Setyowati, Vuri Ayu Soelistijono, Rafi Febian Suheni Suheni Suheni Suheni Suheni Suheni Trianto, Ryo Andika Vuri Ayu Setyowati Vuri Ayu Setyowati Vuri Ayu Setyowati Wicaksono, Zaki Yudi Andika Zakaria, Abdul Majid