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For over a century, Cepu has been known as one of the oil and gas producers in Indonesia. One of the oil and gas field that is estimated to produce natural gas is Balun field with a number of wells still exist in Cepu residential areas. Balun field was first explored and exploited in 1939 until its closure in 2007 due to economical and safety consideration by PT Pertamina. PEM Akamigas, as a vocational education institution specializing in oil and gas, is currently carrying out feasibility study for re-activation of well in Balun gas field, based on technical, safety and financials for city gas purposes. One of the technical aspects in the study is through mechanical preliminary design and construction cost estimation. The gas from P 02 well consists of approximately 29 % of CO2, that needs to be removed. Amine regenaration method has been selected to reduce the carbon di-oxyde content before the natural gas be transferred to city gas pipeline. According to earlier study, the production capacity of the well is only 0.2 MMscfd, however the amine regeneration process equipment is designed to have 1 MMscfd maximum capacity. The mechanical design includes pressure vessel design, i.e. High pressure separator, low pressure separator, gas scrubber and piping system. The design also includes the equipment and piping layout in the gas removal area at PM 01. The pressure vessel design is according to ASME VIII-1, whilst piping design uses ASME B31.3 codes.