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All Journal Rekayasa Mesin Journal of Materials Exploration and Findings
Putra, Wahyuaji Narottama
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Mechanical Engineering

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The Comparison of Pipe Thickness Selection Method Using Full Flange Rating and non-Full Flange Rating of Cryogenic Services in an LNG Plant Construction Agustar, Ari; Iskandar, Isdaryanto; Putra, Wahyuaji Narottama
Journal of Materials Exploration and Findings Vol. 1, No. 2
Publisher : UI Scholars Hub

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Abstract

Significant growth of gas demand as a source of power generation for domestic use and industries, mainly in the developed countries, has forced the effort to secure the gas supplies located thousands of miles away across the sea as an economical way of gas transportation instead of transporting by pipeline. LNG technology was created as the solution. Natural gas is refrigerated below its boiling point (-160oC to -162oC), known as cryogenic temperature or cryogenic service. Material of Construction (MOC) selection report showed that 304/304L and 316/316L Stainless Steel pipe could withstand and be suitable for this type of service. However, the SS pipe price could be much more costly than the CS pipe. An alternative philosophy to the full-flange rating is introduced in this paper to reduce SS pipe thickness without sacrificing safety issues and proper engineering practice. The philosophy of the pipe wall-thickness calculation method utilized in this paper showed no impact on the class 150 rating due to the selected thicknesses being equal or higher. However, the class 300 rating successfully reduced pipe selected thickness for pipe sizes larger than 24 inches ranging from 20,15% to 31,1%, and for class 600 rating successfully reduced the thickness ranging from 6,28% to 16,55% for pipe sizes 10 inches and larger. The overall pipe thickness reduction reduced pipe weight for cryogenic services by approximately 91,84 tons. The philosophy of the pipe wall-thickness calculation method for cryogenic services can be extended to all other services in the entire LNG production train to gain maximum cost savings for the pipe purchasing cost.
The Effect of Graphite and Activated Carbon as Dispersed Particle in Base Fluid as Quench Medium on the Hardness of S45C Carbon Steel Putra, Wahyuaji Narottama; Somadinata, Danika Aprilia; Ramahdita, Ghiska
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Adding a solid particle dispersion into a base fluid could increase its thermal conductivity, hence increasing the heat transfer characteristics. One example of this thermally enhanced fluid is in heat treatment industry as quench medium. By controlling the amount of the dispersed particle, the cooling rate of the quench medium can be altered, and could affect steel hardness after heat treatment. In this research, the dispersed particle used was commercially available graphite and activated carbon particle. As for the base fluid, distilled water and common engine oil were compared. The concentration of the dispersed particle was 0.1, 0.3, 0.5 weight percent. The highest hardness was achieved at 728 HV on the 0.1% activated carbon particle in water base fluid. Meanwhile, by using graphite, the highest hardness achieved was at 639 HV on the 0.1% particle in water base fluid. The result may suggest that activated carbon could improve the cooling rate better due to its impurities. As expected, quenching by dispersed graphite particle in oil based resulted in lower hardness on all variables.
THE EFFECT OF PYROLYSIS DURATION ON THERMAL CONDUCTIVITY, STABILITY, AND VISCOSITY OF DISPERSED PCB-BASED PARTICLES IN THERMAL FLUID Putra, Wahyuaji Narottama; Ariati, Myrna; Suharno, Bambang; Ferdian, Deni; Ulum, Reza Miftahul
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1655

Abstract

Solid particles have a higher thermal conductivity compared to a fluid. Therefore, it is a common practice to disperse solid particles inside a base fluid to increase its thermal conductivity. The particle-dispersed fluid is called a thermal fluid. Thermal fluid, such as a coolant, is widely used as a heat transfer fluid. Several types of particles can be used to increase the thermal conductivity of the fluid, i.e., metallic particles, metal-oxide particles, or even carbon-based particles. In this research, a carbon-based particle was used as the dispersed particle. The particle was obtained by processing electronic waste, specifically Printed Circuit Board (PCB). The PCB was pyrolyzed for variable duration at 15, 30, and 45 minutes to increase the carbon content. After pyrolyzing, the particle was milled to reduce its size. Subsequently, the PCB particle was added to distilled water. Sodium Dodecylbenzene Sulfonate (SDBS) was added as a surfactant to increase fluid stability and prevent particle agglomeration. Thermal conductivity was improved by up to a 13% increase at the 15-minute pyrolysis. Adding SDBS surfactant also improves the thermal fluid's stability to -29,1 mV. The fluid's viscosity was slightly increased up to a maximum of 0.984 mPa.S.
THE EFFECT OF PYROLYSIS DURATION ON THERMAL CONDUCTIVITY, STABILITY, AND VISCOSITY OF DISPERSED PCB-BASED PARTICLES IN THERMAL FLUID Putra, Wahyuaji Narottama; Ariati, Myrna; Suharno, Bambang; Ferdian, Deni; Ulum, Reza Miftahul
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1655

Abstract

Solid particles have a higher thermal conductivity compared to a fluid. Therefore, it is a common practice to disperse solid particles inside a base fluid to increase its thermal conductivity. The particle-dispersed fluid is called a thermal fluid. Thermal fluid, such as a coolant, is widely used as a heat transfer fluid. Several types of particles can be used to increase the thermal conductivity of the fluid, i.e., metallic particles, metal-oxide particles, or even carbon-based particles. In this research, a carbon-based particle was used as the dispersed particle. The particle was obtained by processing electronic waste, specifically Printed Circuit Board (PCB). The PCB was pyrolyzed for variable duration at 15, 30, and 45 minutes to increase the carbon content. After pyrolyzing, the particle was milled to reduce its size. Subsequently, the PCB particle was added to distilled water. Sodium Dodecylbenzene Sulfonate (SDBS) was added as a surfactant to increase fluid stability and prevent particle agglomeration. Thermal conductivity was improved by up to a 13% increase at the 15-minute pyrolysis. Adding SDBS surfactant also improves the thermal fluid's stability to -29,1 mV. The fluid's viscosity was slightly increased up to a maximum of 0.984 mPa.S.
Remaining Life Assessment and Fitness for Service Evaluation of Aging Chemical Reactors in Polyethylene Terephthalate Resin Industry Munthe, Aditya Pahlawan; Dhaneswara, Donanta; Putra, Wahyuaji Narottama; Widyaputra, Gama
Journal of Materials Exploration and Findings Vol. 4, No. 2
Publisher : UI Scholars Hub

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Abstract

Aging chemical reactors in the polyethylene terephthalate (PET) resin industry require comprehensive evaluation to ensure safe continued operation. This study conducts a remaining life assessment (RLA) and fitness-for-service (FFS) evaluation on five 30-year-old reactors, based on API 510, API 579/ASME FFS-1, and ASME BPVC Section VIII Div. 1 standards. The analysis involves corrosion rate measurement, future corrosion allowance (FCA) projection, and minimum thickness verification. Among the reactors, R-120 was found to have the shortest remaining life less than 15 years. FFS assessments using three criteria Average Measured Thickness, MAWP from Point Thickness Readings, and Minimum Measured Thickness confirm that R-120 meets all safety requirements. The head and shell thicknesses exceed the minimum allowable values; calculated MAWPr values are above the design MAWP; and thicknesses adjusted for FCA remain above 50% of the minimum required. These results indicate that R-120 remains fit for continued service. This study underscores the critical role of standardized assessment and routine inspection in extending the safe operating life of aging process equipment
Co-Authors Agustar, Ari Bambang Suharno Deni Ferdian Dhaneswara, Donanta Ghiska Ramahdita, Ghiska Isdaryanto Iskandar Munthe, Aditya Pahlawan Myrna Ariati, Myrna Somadinata, Danika Aprilia Ulum, Reza Miftahul Widyaputra, Gama