Analisa Tegangan Redesain Underground Sectional Valve menjadi Aboveground Sectional Valve pada Gas Transmission Pipeline
Abstract - Pipeline along Fatmawati to Lebak Bulus with 8 inch diameter and 2.9 kilometer with fluids flow between gas stations. Along the pipeline, there is a sectional valve that’s very important to manage and control distributed fluids inside the pipeline. Pit limitations, humidity, and puddle water at rainy season may cause maintenance process and operation become less maximum. Thereby redesign are performed from underground sectional valve to aboveground sectional valve with transition pipe. This research start from calculating minimum wall thickness, minimum allowable span, and virtual anchor on pipe. Selection of design includes pipe bends, valve location, amount of supports, and pipe elevation. Selection valve redesign results will be analyzed by using manual calculations and software stress analysis. Redesign results of the sectional pipe determine the value of minimum wall thickness of 0.0425inch. Pipe bends with 45 degree angle and 5D radius hot bend method. Pipe elevation is +750 mm from ground level with maximum distance of each support of 266.568 inch. Calculation result of stress analysis has fulfilled the allowable stress based on ASME B31.8. Thereby, it can be sure that the aboveground sectional valve design is safe and can become consideration on the next research.