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Dwi Priyanta

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Author-ID : 3419311

Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Articles

Application Waste Sawdust as Mixed Polyurethane Insulation in Traditional Cold Storage of Fishing Vessel Sutopo Purwono Fitri; M. Badrus Zaman; Dwi Priyanta; Mochamad Hidayat
International Journal of Marine Engineering Innovation and Research Vol 1, No 2 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

In the process of fishing it takes some supplies such as fishing equipment, instrumentation and storage of fish. The traditional fishermen of their fishing days fishing usually only bring ice cubes. Solid plastic polyurethane foam is a mixture solution of polyols and isocyanates, commonly used as an insulating material storage. From the observation waste generated being sawmill sawdust per spindle with diameter of 30 cm and a length of 1 m with 5 times sawmill, Saws 0.8 cm thick produced 0.0088 m³ / burnable logs only discarded. Therefore takes thermal conductivity test to review mixture of sawdust and polyurethane comparison with variations different dosing. Maximum disposals sawdust can be done is 40% of the total volume of material mixture, polyurethane and sawdust because composite material (sawdust-polyurethane) can not be bond with good so easy slab separately from origin form. Thermal Conductivity insulating good and economical on disposals 40% wood flour (0.05252 W / m°C) and is able to maintain a 2 kg of ice crystals melt up perfect on 34 hours. Operating profits economical from 4,8 m³insulation composite application with obtained Rp 4.486.000 compared with 100% Polyurethane Insulation Manufacture.

Vibration Spectrum Analysis for Indicating Damage on Turbine and Steam Generator Amurang Unit 1 Beny Cahyono; Dwi Priyanta; Fakhri Rizqullah Fajar Ramadhan
International Journal of Marine Engineering Innovation and Research Vol 2, No 1 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Maintenance on machines is a mandatory asset management activity to maintain asset reliability in order to reduce losses due to failure. 89% of defects have random failure mode, the proper maintenance method is predictive maintenance. Predictive maintenance object in this research is Steam Generator Amurang Unit 1, which is predictive maintenance is done through condition monitoring in the form of vibration analysis. The conducting vibration analysis on Amurang Unit 1 Steam Generator is because vibration analysis is very effective on rotating objects. Vibration analysis is predicting the damage based on the vibration spectrum, where the vibration spectrum is the result of separating time-based vibrations and simplifying them into vibrations based on their frequency domain. The transformation of time-domain-wave into frequency-domain-wave is using the application of FFT, namely AMS Machinery. The measurement of vibration value is done on turbine bearings and steam generator of Unit 1 Amurang using Turbine Supervisory Instrument and CSI 2600 instrument. The result of this research indicates that vibration spectrum from Unit 1 Amurang Power Plant indicating that there is rotating looseness, even though the vibration value does not require the Unit 1 Amurang Power Plant to stop operating (shut down). This rotating looseness, at some point, can produce some indications that similar with the unbalance. In order to avoid more severe vibrations, it is necessary to do inspection on the bearings in the Amurang Unit 1 Power Plant.

Comparative Analysis of Probability of Failure Determination Using Weibull Distribution and Generic Failure Frequencies on Heat Exchanger Tube Bundles Based on API 581 Dharma Gita Surya Prayoga; Dwi Priyanta; Nurhadi Siswantoro
International Journal of Marine Engineering Innovation and Research Vol 2, No 3 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

RBI analysis for heat exchanger tube has been explained by API 581. Two types of PoF determination using statistical data is provided to determine the PoF category. Both Weibull parameter and generic failure frequencies are the methods that will be analysis in this present study. PoF determination using Weibull distribution gives the exponential value of PoF in a certain of time. This method only consider failure modes and the failure rate of heat exchanger tube without considering possible active damage mechanisms in the tube. However PoF determination using generic failure frequencies gives more complex consideration. It considers not only failure and possible active damage mechanism, but also the effect of management system facilities of the heat exchanger on the integrity of the plant.

HAZOP Study and SIL Verification of Fuel Gas System in ORF Using IEC 61511 Standard and FTA Method Nurhadi Siswantoro; Dwi Priyanta; Afanda Dwi Ragil Risnavian; M. Badrus Zaman; Trika Pitana; Hari Prastowo; Semin Semin
International Journal of Marine Engineering Innovation and Research Vol 7, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Safety is an important aspect of the industrial process. Failure of system and mechanism endanger both human and environmental safety. Safety is obligated to be implemented precisely and thoroughly to prevent failure consequences. One of the preventive implementations is to map out safety devices in the form of SIS (Safety Instrumented System) and other layers of protection. However, to acknowledge this safety device performance used SIL (Safety Integrity Level). This final research is intended to analyze Fuel Gas systems on Onshore Receiving Facilities (ORF). HAZOP (Hazard Operability Study) as process hazard analysis with deviation during the operation so that the risk level is known. SIL verification towards SIL target is SIL-2 refer to IEC 61511 standards by FTA (Fault Tree Analysis) method. From the HAZOP study can be concluded that over-pressure becomes a top hazard to all nodes due to the most severe consequences, the highest likelihood (medium risk). The calculation result of PFDavg is Node 1 (Fuel Gas Scrubber V-6060) is 6,22E-03, Node 2 (Fuel Gas Filter Separator S-6060A) is 1,24E-03, Node 3 (Fuel Gas Filter Separator S-6060B) is 1,24E-03, Node 4 (Fuel Gas Superheater E-6060) is 1,21E-03, and Node 5 (Instrument Gas Receiver V-6070) is 2,23E-03. The conclusion of this research shows that five components of the Fuel Gas System fulfill the SIL-2 target, therefore, doing a re-design to add a safety device is unnecessary

Maintenance Task Allocation And Planning In KT. X Tugboat Using Reliability Centered Maintenance Method Dwi Priyanta; Muhammad Badrus Zaman; Apriagung Diantana P
International Journal of Marine Engineering Innovation and Research Vol 2, No 1 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Reliability Centered Maintenance (RCM) as one of the processes that used to decisive action which should be performed to ensure any physical components or a system can work optimally in accordance with the function desired by its users. Basically, RCM used a risk management principles of the failure of the components so that it can be determined the type of maintenance properly. With the appropriate type of maintenance, then the failures that may occur can be prevented at once to be able to be detected before they occur. Appropriate implementation of RCM, capable of delivering cost savings, the impact on both the cost of maintenance as well as repair costs due to the occurrence of failure. In this paper, the components become the object of research is the main engine of the KT. X tugboat belongs to Pelindo Marine Service (PMS) Surabaya. KT. X tugboat has the lowest level of availability of the entire company-owned tugboat 80.01 percent. Tugboat is one of the main assets of PMS who support the economy of the company. Therefore, it is imperative for a company to further enhance the efficiency of activities of its operations. These include the efficiency of human resources, as well as economic analysis of system reliability of company assets. It is used in order to keep abreast of competition at the world maritime national and globally. Implementation of RCM process on main engine KT. X, priority levels can be specified against the failure of components that have critical consequences. So it can be a planned maintenance system generated properly and efficiently.

Determination of Maintenance Task on Rotary Equipment Using Reliability Centered Maintenance II Method Dwi Priyanta; Nurhadi Siswantoro; Rizky Agung Sukandar
International Journal of Marine Engineering Innovation and Research Vol 4, No 3 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

The process of natural gas into LNG (Liquefied Natural Gas) requires many steps and various types of chemical products. The process also produces waste. The Liquid Incinerator treats waste from LNG process. This unit often experiences damages which causes the plant do not work properly and even a down/trip problems due to the continuous operation and the absence of maintenance program, especially for rotary equipments. This causes environmental pollution because the waste is unprocessed and could have an impact on the increased cost to treat the waste elsewhere. One of approaches to analyze the causes of the damage, the impact and effective treatment for equipment is using Reliability Centered Maintenance (RCM). The RCM method is expected to be able to identify the primary and secondary functions of the system, possible failure function, Failure Mode and Effect Analysis (FMEA), and the maintenance actions on the plant. The FMEA result will be used to determine the proposed maintenance task. Based on the proposed maintenance task, the maintenance interval for each equipment is obtained. After RCM analysis is done on 4 equipments, liquid waste feeding pump (34-G-2), quencher pump (34-G-3), scrubber pump (34-G-4) and air compressor (34-K-4). For 34-G-2 failure mode, requires 78% preventive maintenance and 22% corrective maintenance, 34-G-3 requires 87% preventive maintenance and 13% corrective maintenance, 34-G-4 requires 87% preventive maintenance and 13% corrective maintenance and 34-K-4 requires 70% preventive maintenance and 30% corrective maintenance. Workpackage for each interval is created from every failure mode for each interval for maintenance / inspection.

Risk Assessment in Financial Feasibility of Tanker Project Using Monte Carlo Simulation Muhammad Badrus Zaman; Dwi Priyanta; Filik Trisilo
International Journal of Marine Engineering Innovation and Research Vol 1, No 4 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Every ship project would not be apart from risk and uncertainty issues. The inappropriate risk assessment process would have long-term impact, such as financial loss. Thus, risk and uncertainties analysis would be a very important process in financial feasibility determination of the project. This study analyzes the financial feasibility of 17,500 LTDW tanker project. Risk and uncertainty are two differentiated terminologies in this study, where risk focuses on operational risk due to shipbuilding process nonconformity to shipowner finance, while uncertainty focuses on variable costs that affect project cash flows. There are three funding scenarios in this study, where the percentage of funding with own capital and bank loan in scenario 1 is 100% : 0%, scenario 2 is 75% : 25%, and scenario 3 is 50% : 50%. Monte Carlo simulation method was applied to simulate the acceptance criteria, such as net present value (NPV), internal rate of return (IRR), payback period (PP), and profitability index (PI). The results of simulation show that 17,500 LTDW tanker project funding by scenario 1, 2 and 3 are feasible to run, where probability of each acceptance criteria was greater than 50%. Charter rate being the most sensitive uncertainty over project's financial feasibility parameters.

Co-Authors Afanda Dwi Ragil Risnavian Apriagung Diantana P Beny Cahyono Dharma Gita Surya Prayoga Fakhri Rizqullah Fajar Ramadhan Filik Trisilo Hari Prastowo M. Badrus Zaman Mochamad Hidayat Muhammad Badrus Zaman Nurhadi Siswantoro Rizky Agung Sukandar Semin Semin Sutopo Purwono Fitri Trika Pitana

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