No abstract

Prediction of CO2 corrosion is required for predicting remaining life and determination of the required material selection. This paper give prediction of corrosion rate and remaining life of casing in the North Aceh well which is operated almost 14 years. Simulation method application is appropriate with the condition of North Aceh field since the well fluids contain high CO2 gas (35 – 37%) and small amount of H2S gas (0.016%). Based on historical data North Aceh well’s after production almost 14 years, it is possible that production packer leaks and degradation of cement could cause formation gas migrate through micro channelling inside cement. The CO2 gas which is accumulate in casing could cause CO2 corrosion. The corrosion rate calculation based on temperature 141°C, pressure 103.4 Barg and CO2 contain 37% is 0.871 mm/year. After calculating the thickness loss, we found thickness loss of casing K55 is 12.741 mm. meanwhile thickness of K55 casing 10.92 mm, it means the casing already leak before year 14th. Based on simulation and calculation the North Aceh well is assumed to have tubing and packer leaks in annulus #0 and channeling on annulus #1 so that the well is not recommended for re-production because of the communication between the annulus and the loss of the well barrier that can cause wellhead leakage. This condition is very dangerous because the well fluid is flammable and can cause pollution in the sea.

PT. XYZ yang bergerak dalam industri pembuatan ban mengalami kegagalan yang terjadi pada unit mesin curing Type B45 dimana terjadi kegagalan pada bagian poros low ring, yang mengakibatkan terhentinya proses produksi. Penelitian dilakukan dengan tujuan, mengidentifikasi masalah yang terjadi.Dari hasil penelitian dapat di identifikasi penyebab terjadinya kegagalan pada poros yaitu tegangan geser yang terjadi pada poros low-ring (τ) lebih besar dari tegangan geser yang diijinkan (τa) maka hal ini yang menyebabkan terjadinya retak pada poros tersebut  (  > 102,35 N/mm ). Dari hasil analisis gaya silinder (F2), adalah gaya silinder pada saat silinder retract, adalah model yang signifikan dalam penentuan optimasi desain silinder dalam rangka mengurangi kegagalan pada mesin curing karena korelasinya paling besar dari ketiga model. Pengaruh diameter silinder terhadap gaya sangat tinggi, hal ini dikarenakan koefisien korelasinya sebesar R=0,99985 menunjukan mendekati angka 1. Untuk tindakan perbaikan pada masalah tersebut bisa dilakukan dengan cara mendesain ulang silinder hidrolik. Yaitu dengan merubah ukuran silinder dengan luas penampang yang mendapat tekanan hidrolik (2,1 MPa)) tidak lebih dari 12957,28 mm2.

The current carbon monoxide (CO) emissions are the main component of diseases, such as cough, dizziness, nausea, and shortness of breath for those who inhale them. Pancasila University is one of the colleges in the city of Jakarta that cares about the poor quality of air in the city of Jakarta; therefore, Pancasila University wants to apply the concept of green campus as a form of concern for the environment. This research was conducted at Pancasila University to discover the relationship between air quality in the campus, especially carbon monoxide (CO) substance, and its impact on the health of the university’s academic community members. The methods used in this study are simple linear regression, HIRARC, and hierarchy of control. The results of this study show a relationship between CO substance variables and complaints about diseases suffered by members of the university’s academic community due to the substance, with an R count value of 0.9519. There are substantial risks that the students can experience, including student activities that cause nausea and outdoor employee activities that cause dizziness and nausea. These big risks can be prevented by issuing a decision letter to reduce air pollution at Pancasila University.