Value Stream Mapping to Improve Value Ratio of Subcontracting Process in a Pressure Vessel Manufacturing Facility (A Case Study)

This paper is based on a case study in a pressure vessel manufacturing facility. The facility manufactures air receivers and air-oil separators. The facility subcontracts rolling of shells and forming of dishes. The plant suffers from poor value added ratio. This issue has been addressed with the help of value stream mapping. Current and future state maps have been drawn to improve the value ratio substantially. After implementing the proposed solutions, the value ratio has improved by 100 % for shells and 67 % for dishes.