The phenomenon of environmental pollution in the machinery system is problem that often occurs. One of them is the emission from burning fossil fuels of diesel engines. Therefore, it is necessary to do proper handling to reduce the emission content of diesel engines, one of which is by using catalytic converter engineering technology. In this study, the catalytic converter was made using an activated carbon filter from banana peel waste with sodium hydroxide (NaOH) activator. The activated carbon formed is then mixed with nickel oxide powder to be used as catalyst and white cement as binder. Diesel engine emission testing is carried out with time variations from 3 to 12 minutes. The results show that there is decrease in the content of carbon monoxide (CO) obtained by 57% when testing emissions at minute 12. While for the content of NOx and NO there is decrease of 43%. This indicates that the mixture of activated carbon from banana peel waste and nickel oxide powder is very effective in reducing the content of diesel engine exhaust emissions.

The performance of natural zeolites in a catalytic converter to reduce the emission contents of diesel engine was studied in this research. Diesel engines are engines that use a high compression ratio to carry out a combustion process that will produce high contents of carbon monoxide (CO), nitrogen oxides (NOx), and sulfur oxide (SO2) in diesel engine exhaust gases. One solution to reduce the contents of exhaust gas compounds in diesel engines is to use catalytic converter technology. In this study, the catalytic converter used natural zeolite as an emission filter. The catalytic converter was designed in the form of a pipe made from iron plates and hollow balls that were used as natural zeolite holders. A diesel engine emission test was conducted using a gas analyzer with engine speed variations. The results show the highest reduction efficiency in the emission contents of diesel engine (carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO2)) of 46.14%, 22.77%, and 90.56%, respectively.

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In the case of assembly wellhead, a spacer spools was used to provide space and connect between parts of the wellhead. In order to design spacer spool with specified material should comply the standards and procedures of the oil and gas industry. The results of the material calculation were using the ASME BPVC guidelines. These three materials strengths were calculated if used as a body spacer spool. Based on acceptance criteria on API 6A 21st Edition, these three materials were categorized as acceptable to be used as a body spacer spool for this specification. These three materials strengths were also calculated the stress of the flange and flange rigidity criteria. Based on the acceptance criteria on ASME BPVC guidelines, the results showed that these materials can be used for flange because it had stress value under yield strength of material which was flange rigidity criteria for operating condition has 0.59 and 0.66 for testing condition because had value of rigidity that met with minimum acceptance criteria.