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Waas, Kristofol
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EVALUATION OF THE SANDNESS OF THE NGRAYONG LAYER IN THE XYZ WELL OF PERTAMINA ASSET IV CEPU Untoro, Edi; Waas, Kristofol
International Journal Multidisciplinary Science Vol. 3 No. 2 (2024): June: International Journal Multidiciplinary
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijml.v3i2.1257

Abstract

Most oil and gas wells produce through sandstone formations deposited in marine or detrital environments. Marine sedimentary sands, in which most of the hydrocarbons are found, are often cemented with calcareous or siliceous minerals and may be heavily consolidated. In contrast, Miocene and younger sands are often unconsolidated or only partially consolidated with soft clays or silts. This formation, which is structurally weak, is unlikely to be able to withstand the movement of sand grains. When oils are produced at high flow rates, they can produce sands along with the liquid oil. The movement of fluid through the sandstone reservoir creates stresses in the sand grains due to differences in fluid pressure, fluid friction, and overburden pressure. If this stress exceeds the formation holding force, then the sand grains and fines can move and can be produced with oil liquid. Rapid changes in the liquid production rate can cause unstable conditions which can result in increased sand production. When an oil well begins to produce water, this will often be an indication of the start of sand production. Muecke[1], demonstrated that particle motion occurs in a multiphase system when the wetting phase begins to move. Even consolidated sandstone can be mechanically and chemically damaged over time as the reservoir is produced. The overburden stress on the sand grains will increase as the reservoir pressure decreases. The movement of water can dissolve the minerals that cement the sand grains and can change the production capacity of the formation fluid. Smooth migration can reduce permeability in the perforations. This can result in higher pressure drops in the wellbore and changes in formation stress. Formations cemented by calcite can be damaged by improperly designed acidification, and can result in increased production of sand.
ANALISA KINERJA NATURAL DRAFT COOLING TOWER DI PPSDM MIGAS CEPU Putirulan, Tesya; Waas, Kristofol; Loppies, Leslie S; Lopuhaa, Agustinus Oktovianus
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2914

Abstract

Human resource development center (PPSDM) a series of production processes such as boiler, power plants, coal testing sites, water treatment, fire and safety, pumps, welding workshops, distribution sites and refinery units, one of which is the cooling tower. The cooling tower is part of the power generation system that has a function as a heat exchanger between hot water coming out of the condenser and air so that the water has a lower temperature and can be reused in the condesation proses. The reseach on natural draf cooling tower in PPSDM migas aims to find parameters that affect the performance of natural draf cooling tower such as efficiency, make up water and also the heat transfer capacity of the cooling tower unit. In this writing, researchers use direct research methods in the field to find out the phenomena that occur in the colling Tower. While the performance of the natural draft cooling tower is calculated using the calculation method. The research results show an actual of 82,61 %, the recorded cooling capacity is 2417,941 kJ/s and the make up water value is 24.03 %Keywords: Cooling tower, Range, Approach, Effectiveness, Cooling Capacity, Make-Up Water.
PERHITUNGAN BEBAN PENDINGIN PADA COLD ROOM DAN ABF-1 UNTUK PENYIMPANAN PRODUK HASIL LAUT DI PT. MINA USAHA HARAPAN Kakiay, Isaac Bryant; Waas, Kristofol; Lekatompessy, Roy R.
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2915

Abstract

Refrigeration has become an essential part in the design of spaces that will be occupied by people or products intended to provide space temperature, humidity, other process requirements. Refrigeration was originally used to produce ice, as technology advances, refrigeration has an important role in commercial and non-commercial refrigeration. Research on efficient refrigeration has been carried out by several previous studies. Previous methods were used by calculating cooling efficiency and heat loads that affect cold storage cooling.Based on an interview with one fishery company focused on processing quality seafood products located in PPN Tantui, PT Mina Usaha Harapan, the energy consumption for the cooling system takes up almost 70%-80% of the total energy expenditure of the company. Due to several factors, including excessive heat loads provision, or inefficient cold storage design. Therefore, author wants to calculate the cold storage performance in one of the seafood processing companies based on eco-fishing located in PPN Tantui, PT Mina Usaha Harapan.Calculations and analysis have been carried out in the previous chapter, several conclusions is made: 1) The average value of evaporator capacity is 34.96 kW for Cold Room and 57.39 kW for Air Blast Freezer 2) The calculated total load value (without product load) is 11.94 kW for Cold Room and 3.56 kW for ABF. 3) The company set a time of 9 hours to freeze 3500 kg of seafood, but according to calculation results, it only takes 7 hours to freeze 3830.4 kg of products with product temperature reaching -21 ͦC.Keywords: vapor compression cold storage, refrigeration load, cold room, abf, cold storage, evaporator capacity, seafood products
EVALUASI KINERJA OPERASIONAL RIG SAAT PROSES WORK OVER DAN WELL SERVICE PADA SUMUR XT PT PERTAMINA CEPU FIELD DISTRIK 1 KAWENGAN Talahatu, Tommy Daud Jeferson; Indriani, Erdila; Waas, Kristofol
Journal Mechanical Engineering Vol. 3 No. 1 (2025): APRIL
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3324

Abstract

Workover and well service activities are routine activities to repair and maintain production wells, such as replacing oil pump equipment and changing well hole reservoir parameters such as drilling and cracking activities This is done to repair and maintain wells so that they can always produce according to the specified potential However, during the work, the production of each well that requires repair must be temporarily stopped until the well is repaired. The length of time a well is not producing depends on the length of the repair of the well. Therefore, drilling performance must be evaluated to avoid delays in well production in the long term. Based on the results of this study, the PDSI# 35.1/IDECO H-35-M rig has a performance level of 88% for 15 days; the performance presentation of the rig is good. In addition, from the results of the NPT using a Pareto diagram, there are several main problems that cause rig performance, namely, waiting for a bright day, waiting for equipment repair time, inspection/safety checklist, and waiting for licensing time.Keywords: Rig Operational Performance. Workover and Well service, Pareto Diagram, non-productive time
STUDI EKSPERIMENTAL KEAUSAN SABUK-V STANDAR DAN NON-STANDAR PADA SISTEM TRANSMISI CVT SEPEDA MOTOR MATIC Taribuka, Semuel M; Waas, Kristofol; Waas, Victor D
Journal Mechanical Engineering Vol. 3 No. 1 (2025): APRIL
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3424

Abstract

Automatic motorcycles are a type of motorcycle equipped with an automatic transmission system that does not require a manual gear lever for shifting. The gear ratio changes automatically according to the engine speed, allowing the rider to control acceleration solely by adjusting the throttle. The use of an automatic transmission, or Continuous Variable Transmission (CVT), in this system relies on a standard V-belt, as it significantly affects engine performance. However, some motorcycle owners use non-standard belts because they are cheaper, which often leads to faster wear. This study was conducted to determine the wear rate experienced by both standard and non-standard belts after a certain period of use under specific operating conditions. The method used to evaluate belt wear rated an experimental approach, in which the motorcycle was operated at an average speed of 40 km/h over a distance of 24 km for three hours per day, over a period of three months (12 weeks). Each week consisted of 5 days of testing, with the first 6 weeks allocated for the standard belt and the following 6 weeks for the non-standard belt. After the testing period, the belts were removed and their wear was measured. The measurements were compared to the initial data to determine the amount of wear that had occurred. The results showed that the standard belt, after 6 weeks of use (90 hours), experienced wear of: 0.10 mm in diameter, 0.72 mm in upper width, and 0.25 mm in lower width. Meanwhile, the non-standard belt exhibited wear of 0.31 mm in diameter, 0.92 mm in upper width, and 0.78 mm in lower width. Based on these findings, using a standard belt is preferable, as it does not wear as quickly as a non-standard belt. Keywords: automatic motorcycle, V-belt, wear rated.
ANALISA KINERJA NATURAL DRAFT COOLING TOWER DI PPSDM MIGAS CEPU Putirulan, Tesya; Waas, Kristofol; Loppies, Leslie S; Lopuhaa, Agustinus Oktovianus
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2914

Abstract

Human resource development center (PPSDM) a series of production processes such as boiler, power plants, coal testing sites, water treatment, fire and safety, pumps, welding workshops, distribution sites and refinery units, one of which is the cooling tower. The cooling tower is part of the power generation system that has a function as a heat exchanger between hot water coming out of the condenser and air so that the water has a lower temperature and can be reused in the condesation proses. The reseach on natural draf cooling tower in PPSDM migas aims to find parameters that affect the performance of natural draf cooling tower such as efficiency, make up water and also the heat transfer capacity of the cooling tower unit. In this writing, researchers use direct research methods in the field to find out the phenomena that occur in the colling Tower. While the performance of the natural draft cooling tower is calculated using the calculation method. The research results show an actual of 82,61 %, the recorded cooling capacity is 2417,941 kJ/s and the make up water value is 24.03 %Keywords: Cooling tower, Range, Approach, Effectiveness, Cooling Capacity, Make-Up Water.
PERHITUNGAN BEBAN PENDINGIN PADA COLD ROOM DAN ABF-1 UNTUK PENYIMPANAN PRODUK HASIL LAUT DI PT. MINA USAHA HARAPAN Kakiay, Isaac Bryant; Waas, Kristofol; Lekatompessy, Roy R.
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2915

Abstract

Refrigeration has become an essential part in the design of spaces that will be occupied by people or products intended to provide space temperature, humidity, other process requirements. Refrigeration was originally used to produce ice, as technology advances, refrigeration has an important role in commercial and non-commercial refrigeration. Research on efficient refrigeration has been carried out by several previous studies. Previous methods were used by calculating cooling efficiency and heat loads that affect cold storage cooling.Based on an interview with one fishery company focused on processing quality seafood products located in PPN Tantui, PT Mina Usaha Harapan, the energy consumption for the cooling system takes up almost 70%-80% of the total energy expenditure of the company. Due to several factors, including excessive heat loads provision, or inefficient cold storage design. Therefore, author wants to calculate the cold storage performance in one of the seafood processing companies based on eco-fishing located in PPN Tantui, PT Mina Usaha Harapan.Calculations and analysis have been carried out in the previous chapter, several conclusions is made: 1) The average value of evaporator capacity is 34.96 kW for Cold Room and 57.39 kW for Air Blast Freezer 2) The calculated total load value (without product load) is 11.94 kW for Cold Room and 3.56 kW for ABF. 3) The company set a time of 9 hours to freeze 3500 kg of seafood, but according to calculation results, it only takes 7 hours to freeze 3830.4 kg of products with product temperature reaching -21 ͦC.Keywords: vapor compression cold storage, refrigeration load, cold room, abf, cold storage, evaporator capacity, seafood products
ANALISIS PERBANDINGAN PENGGUNAAN BIODIESEL B35 DAN B40 TERHADAP KINERJA MOTOR DIESEL DI PLTMG SERAM PEAKER La Idi, Adi Septi; Waas, Kristofol; Talakua, Clay
Journal Mechanical Engineering Vol. 3 No. 3 (2025): DESEMBER
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3643

Abstract

This study analyzes the effect of using B35 and B40 blended biodiesel fuels on the performance of a MAN 12V 51/60 DF diesel engine at the Seram Peaker Gas Engine Power Plant (PLTMG). The background for this research is the national mandatory biodiesel policy, which continues to increase its blend ratio. The results show that by using 1 kg of fuel, the B35 blend can produce 12.486 MW of power with a fuel consumption of 0.2100 kg/kWh, an effective thermal efficiency of 20.31%, and a mechanical efficiency of 0.91092. Meanwhile, the B40 blend produces 12.367 MW with a higher fuel consumption of 0.21884 kg/kWh, an effective thermal efficiency of 18.92%, and a mechanical efficiency of 0.887581. These data indicate that increasing the biodiesel content from B35 to B40 tends to decrease the power output and engine efficiency, while fuel consumption increase.  Keywords: Biodiesel, B35, B40, Diesel Engine Performance.
Rancang Bangun Prototipe Heat Exchanger Type Shell and Tube Arah Aliran Searah Hatuwe, Azmain N; Hayoto, Anisa Muhammad; Waas, Kristofol
Journal Mechanical Engineering Vol. 3 No. 3 (2025): DESEMBER
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3694

Abstract

This research aims to analyze the design and fabrication of a parallel-flow shell-and-tube heat exchanger prototype. The research was motivated by the need for concrete and effective practical learning media in the Mechanical Engineering Department of Ambon State Polytechnic, which is currently limited to theoretical material. The design method for this device uses a "build and build" approach. This design combines a 6 mm diameter aluminum pipe for the hot fluid tube and a 4 inch diameter galvanized iron pipe as the shell for the cold fluid. The fluid used for the hot and cold sides is water. The mass flow rates applied to the hot and cold fluids are 0.089 kg/s and 0.12572989 kg/s, respectively. The design calculations resulted in the creation of a prototype exchanger with a shell length of 0.5 m, an outer tube diameter of 0.006 m, and 74 aluminum tubes. Leakage testing was conducted using compressed air at 16 psi for 5 minutes. No leaks were found during the test. Keywords : heat exchanger,, shell and tube, parallel flow
Co-Authors Hatuwe, Azmain N Hayoto, Anisa Muhammad Indriani, Erdila Kakiay, Isaac Bryant La Idi, Adi Septi Lekatompessy, Roy R. Loppies, Leslie S Lopuhaa, Agustinus Oktovianus Putirulan, Tesya Talahatu, Tommy Daud Jeferson Talakua, Clay Taribuka, Semuel M Untoro, Edi Waas, Victor D