scholarly journals SERANGAN KOROSI SUMURAN (PITTING CORROSION) PADA PIPA ROLL BEARING DISTRIBUSI

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Hadi Sunandrio ◽  
Laili Novita Sari

Dalam instalasi explorasi minyak, peralatan yang digunakan untuk menyalurkan minyak mentah dari sumur minyak ke tangki - tangki penampungan melalui pipa distribusi. Dimana untuk membagi ke masing-masing tanki penampungan pada pipa distribusi unit penyaluran minyak yang dibuat dapatberputar dengan menggunakan roll bearing.Pada penelitian ini telah diamati kerusakan yang terjadi pada disuatu instalasi explorasi minyak yang mengakibatkan kebocoran. Hasil penelitian menunjukkan bahwa penyebab utama kerusakan pada roll bearing karena adanyaserangan korosi sumuran . Pada bagian dalam bearing pada kondisi beroperasi selalu bersentuhan langsung dengan cairan / minyak secara terus menerus yang mengandung air danelemen-elemen yang bersifat korosif. Dalam keadaan demikian maka clearence pada bearing akan membesar dan pada akhirnya akan timbul kebocoran. Pemeriksaan dan pengujian yang dilakukan terhadap roll bearing, meliputi :pemeriksaan fraktografi dan metalografi, uji kekerasan, analisa komposisi kimia, serta pemeriksaan dengan SEM dan EDAX. Data dari hasil pemeriksaan dan pengujian tersebut kemudian di analisa untuk mengetahui penyebab terjadinya kebocoran pada roll bearing tersebut.

2020 ◽  
Vol 64 (1-4) ◽  
pp. 19-29
Author(s):  
Shuting Ren ◽  
Yong Li ◽  
Bei Yan ◽  
Jinhua Hu ◽  
Ilham Mukriz Zainal Abidin ◽  
...  

Structures of nonmagnetic materials are broadly used in engineering fields such as aerospace, energy, etc. Due to corrosive and hostile environments, they are vulnerable to the Subsurface Pitting Corrosion (SPC) leading to structural failure. Therefore, it is imperative to conduct periodical inspection and comprehensive evaluation of SPC using reliable nondestructive evaluation techniques. Extended from the conventional Pulsed eddy current method (PEC), Gradient-field Pulsed Eddy Current technique (GPEC) has been proposed and found to be advantageous over PEC in terms of enhanced inspection sensitivity and accuracy in evaluation and imaging of subsurface defects in nonmagnetic conductors. In this paper two GPEC probes for uniform field excitation are intensively analyzed and compared. Their capabilities in SPC evaluation and imaging are explored through simulations and experiments. The optimal position for deployment of the magnetic field sensor is determined by scrutinizing the field uniformity and inspection sensitivity to SPC based on finite element simulations. After the optimal probe structure is chosen, quantitative evaluation and imaging of SPC are investigated. Signal/image processing algorithms for SPC evaluation are proposed. Through simulations and experiments, it has been found that the T-shaped probe together with the proposed processing algorithms is advantageous and preferable for profile recognition and depth evaluation of SPC.


Alloy Digest ◽  
2005 ◽  
Vol 54 (3) ◽  

Abstract Inconel alloy 22 is an advanced corrosion-resistant alloy with exceptional resistance to aqueous and pitting corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-624. Producer or source: Special Metals Corporation.


Alloy Digest ◽  
2000 ◽  
Vol 49 (5) ◽  

Abstract Nirosta 4429 is a low-carbon, high-nitrogen version of type 316 stainless steel. The low carbon imparts intergranular corrosion resistance while the nitrogen imparts both higher strength and some increased pitting corrosion resistance. It is recommended for use as welded parts that need not or cannot be annealed after welding. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-787. Producer or source: ThyssenKrupp Nirosta.


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