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All Journal Reaktor International Journal of Science and Engineering (IJSE) Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan Scientific Contributions Oil and Gas

Yulius Deddy Hermawan

Department Of Chemical Engineering, Faculty Of Industrial Engineering, Universitas Pembangunan Nasional “Veteran” Yogyakarta

Author-ID : 2840000

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

Published : 16 Documents Claim Missing Document

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Comparative Analysis Between PI Conventional and Cascade Control in Heater-PFR-Series Dedy Kristanto; Yulius Deddy Hermawan
Reaktor Volume 20 No.3 September 2020
Publisher : Dept. of Chemical Engineering, Diponegoro University

The goals of this work are to compare and analyze the use of PI conventional and Cascade control configuration in heater-plug-flow-reactor-series (Heater-PFR-series) to produce benzene through the reaction of hydrodealkylation of toluene (HDA).The two control configurations were rigorously examined in UniSim dynamic simulation environment. The PI control parameters were tuned by using “autotuner” mode of UniSim. As shown in dynamic simulation study, the two control configurations with its tuning parameters gave the fast and stable responses. This study revealed that the Cascade control acted very well and its responses were better and faster than those in PI-conventional.Keywords: cascade control; dynamic simulation; PFR; PI conventional; UniSim

DYNAMIC SIMULATION AND COMPOSITION CONTROL IN A 10 L MIXING TANK Yulius Deddy Hermawan; Gogot Haryono
Reaktor Volume 14, Nomor 2, Oktober 2012
Publisher : Dept. of Chemical Engineering, Diponegoro University

The open loop experiment of composition dynamic in a 10 L mixing tank has been successfully done inlaboratory. A 10 L tank was designed for mixing of water (as a stream-1) and salt solution (as astream-2 with salt concentration, c2 constant). An electric stirrer was employed to obtain uniformcomposition in tank. In order to keep the liquid volume constant, the system was designed overflow. Inthis work, 2 composition control configurations have been proposed; they are Alternative-1 andAlternative-2. For Alternative-1, the volumetric-rate of stream-1 was chosen as a manipulatedvariable, while the volumetric-rate of stream-2 was chosen as a manipulated variable for Alternative-2. The composition control parameters for both alternatives have been tuned experimentally. Thevolumetric-rate of manipulated variable was changed based on step function. The outlet stream’scomposition response (c3) to a change in the input volumetric-rate has been investigated. Thisexperiment gave Proportional Integral Derivative (PID) control parameters. The gain controllers Kc[cm6/(gr.sec)] for Alternative-1 and Alternative-2 are -34200 and 40459 respectively. Integral timeconstant ( tI) and Derivative time constant (tD) for both alternatives are the same, i.e. tI = 16 second,and tD = 4 second. Furthermore, closed loop dynamic simulation using computer programming wasalso done to evaluate the resulted tuning parameters. The developed mathematical model ofcomposition control system in a mixing tank was solved numerically. Such mathematical model wasrigorously examined in Scilab software environment. The results showed that closed loop responses inPID control were faster than those in P and PI controls.

Design of Level Control in A 10 L Pure Capacitive Tank: Stability Analysis and Dynamic Simulation Yulius Deddy Hermawan; Renung Reningtyas; Siti Diyar Kholisoh; Tutik Muji Setyoningrum
International Journal of Science and Engineering Vol 10, No 1 (2016)
Publisher : Chemical Engineering Diponegoro University

The open loop experiment of a 10 L pure capacitive tank has been successfully done in laboratory. The square tank connected with a pump was designed for investigation in laboratory, and the water was chosen as a fluid with its input volumetric rate of fi(t) [cm3/min]. The output volumetric rate of fo(t) can be adjusted by changing the pump voltage of vpu(t) [volt]. The open loop experiment has given the steady state parameters, and it could then be used for calculating the dynamic parameters. This study has proposed the level control configuration of a 10 L pure capacitive tank system; liquid level in the tank h(t) was kept constant by manipulating the pump voltage of vpu(t); and the input water volumetric rate of fi(t) was considered as a disturbance. The P-only-control was implemented to control the level. Purposes of this study are to analyze the stability of the closed loop responses and to do the closed loop dynamic simulation. The closed loop mathematical model was solved analytically with Laplace Transform, and Routh-Hurwitz criterion was chosen to analyze the stability. Since the closed loop model was found in the 2nd order system, the response depended on the value of the damping coefficient (ζ), in which it was really affected by the controller gain (Kc). In order to examine the control configuration, the input water volumetric rate disturbance (with amount of ±14%) was made based on step function. Based on the stability analysis, a stable response would be achieved if the controller gain is negative (Kc<0) and the damping coefficient is positive (ζ>0). Based on the dynamic simulation, the controller gain was recommended in between -117.36 [volt/cm] and -1.17 [volt/cm] and the damping coefficient in between 0 and 1. This study also revealed that by tuning an appropriate controller gain, the fastest and the stable response would be achieved.

Dinamika Suhu pada Sistem Tangki-Seri-Tak-Berinteraksi dengan Arus Recycle Hermawan Yulius Deddy
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2010: Prosiding SNTKK 2010
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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This research studies the temperature dynamic behavior of non-interacting-tank (NIT) with recycle-stream which is frequently used in industries. Two tanks with volume of 25 liters are designed and arranged in series for experimentation in laboratory. Part of liquid from Tank-2 is recycled back to the Tank-1. In this work, the liquid volume of both Tank-1 and Tank-2 are remained at constant value. The heat disturbance load has been made based on both step increase and decrease. Those disturbances include the changes of temperature in input (T i) and recycle (TR) streams. The temperature dynamic behavior of NIT system has also been explored. As can be seen from our investigation in laboratory, both of Tank-1 and Tank-2 in NIT system produce a stable response to the disturbance change in temperature of the input and recycle streams. Furthermore, dynamic simulation using computer programming is also done, and its simulation results are compared with the experiment data from laboratory. The developed mathematical model of the NIT system is solved numerically. Such mathematical model is rigorously examined in Scilab software environment. This research also shows that the trends of temperature dynamic simulation results are quite similar with those in our experiment results.

Dinamika Level Cairan pada Sistem Tangki-Seri-Tak-Berinteraksi dengan Arus Recycle Hermawan Yulius Deddy
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2010: Prosiding SNTKK 2010
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Techno-Economic Design of Onshore Gas Pipelines with High CO₂ and H₂S Content Pamungkas, Joko; Pramadewi , Indrianti; Hermawan, Yulius Deddy; Yuliestyan, Avido; Yusuf, Yusmardhany; Kurniawan, Aditya; Ramadhan, Muhammad Redo; Anggorowati, Heni; Perwitasari; Wulandari, Mutiara; Lazuardi, Muhammad Daffa
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2023

This study develops a simulation-based techno-economic framework for designing an onshore gas trunkline system to accommodate production from newly developed wells in the X and Y Fields. The system transports 35 MMSCFD of untreated natural gas containing approximately 60 mol% CO₂ and 70 ppm H₂S, where high acid gas content and declining wellhead pressure impose constraints on pressure delivery, flow velocity, material selection, and lifecycle cost. Steady-state hydraulic simulations were performed using UniSim R490 to evaluate early- and mid-life production scenarios based on pressure drop and erosional velocity ratio (EVR) in accordance with API RP 14E. Comparative analysis of candidate pipeline diameters shows that a 12-inch trunkline maintains a minimum delivery pressure of 50 psig while keeping EVR below unity, thereby satisfying hydraulic and mechanical integrity requirements without excessive recompression. The integration of an onshore booster compressor mitigates reservoir pressure decline and sustains gas transport to the central processing facility. Material selection analysis identifies duplex stainless steel and SS 316 as technically viable options for CO₂-H₂S service under controlled operating conditions. Techno-economic evaluation indicates that the selected configuration minimizes total lifecycle cost relative to alternative designs, with estimated CAPEX of USD 228.43 million and annual OPEX of USD 142.19 million. The results demonstrate that integrated hydraulic optimization, sour-service material selection, and economic assessment provide a robust and economically optimized design approach for onshore sour gas pipeline systems.

Co-Authors Aditya Kurniawan Amy Farury Ludwinia Aryandhanu Mukti Tri Perkasa Avido Yuliestyan Dedy Kristanto Dedy Kristanto Dedy Kristanto Fauzan Irfandy Gogot Haryono Hariyadi Hariyadi Hariyadi Hariyadi Harriyadi Harriyadi Indah Permatasari Joko Pamungkas Lazuardi, Muhammad Daffa Lili Suryani perwitasari Pramadewi , Indrianti Ramadhan, Muhammad Redo Ramantasia Aktariastiwi Kusuma Putri Renung Reningtyas Riski Ajin Rahmadi Siti Diyar Kholisoh Siti Diyar Kholisoh Tutik Muji Setyoningrum Wibiana Wulan Nandari Wibowo Wibowo wibowo wibowo Wulandari, Mutiara Yusmardhany Yusuf Yusuf, Yusmardhany

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