Improving the Failure Rate of Holding Pressure of Gas Pipeline by 6σ Method

品管控制氣體管路保壓失敗率之研究

鐘啟榮(Chung-Chi Jung) ； 李世文(Shih-Wen Lee) ； 陳德請(Der-Chin Chen)

《中華科技大學學報》 57期 (2013/10) Pp. 33-46

摘要

本研究利用SIPOC模組建立實驗流程、魚骨圖與矩陣圖來找出管路保壓失敗的原因，及應用DMAIC手法改善管路保壓失敗率，訂出最佳更換鋼瓶SOP及工具選擇。因氣體壓力會受溫度影響，使用給呂薩克定律來計算出正確壓力值，以確保管路保壓壓力的正確性，並進一步使用六標準差分析實驗數據可靠性及直線迴歸分析証實SOP流程的改善效果。此方法經實驗測試，可以使氣體管路保壓失敗率由30.5%降低至8.3%。

關鍵字

六標準差 ； 迴歸分析

並列摘要

This research applies SIPOC (suppliers, inputs, process, outputs, and customers) model to build the experimental processes, the fishbone diagram as well as the matrix diagram to find the causes of failure and applies DMAIC method to improve the failure rate of pipeline, respectively. Then, the optimal SOP of the replacement of cylinders and the selection of the tools are established. The gas pressure of pipeline is affected by temperature, and the Gay-Lussac's law is used to calculate the correct pressure value in order to ensure the validity of the holding pressure in the pipeline. Furthermore, Six Sigma tools are applied to analyze the reliability of the data and linear regression analysis, to assure the improvement of SOP. This method is tested by experiment, results show the failure rate of the holding pressure of gas pipeline can be reduced from 30.5% to 8.3%.

並列關鍵字

SIPOC ； DMAIC ； 6 Sigma ； SOP ； regression analysis