The primary intent of the current research is to provide insights regarding the management of spare parts within the supply chain,in conjunction with offering some methods for enhancing forecasting and inventory manag...The primary intent of the current research is to provide insights regarding the management of spare parts within the supply chain,in conjunction with offering some methods for enhancing forecasting and inventory management.In particular,to use classical forecasting methods,the use of weak and unstable demand is not recommended.Furthermore,statistical performance measures are not involved in this particular context.Furthermore,it is expected that maintenance contracts will be aligned with different levels.In addition to the examination of some literature reviews,some tools will guide us through this process.The article proposes new performance analysis methods that will help integrate inventory management and statistical performance while considering decision maker priorities through the use of different methodologies and parts age segmentation.The study will also identify critical level policies by comparing different types of spenders according to the inventory management model,also with separate and common inventory policies.Each process of the study is combined with a comparative analysis of different forecasting methods and inventory management models based on N.A.C.C.parts supply chain data,allowing us to identify a set of methodologies and parameter recommendations based on parts segmentation and supply chain prioritization.展开更多
A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service st...A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service stations. In this paper the inventory theory including its background and characteristics is introduced. At the same time, the application of the theory in some trades today, especially in petroleum trade, is analyzed. Then (s, S) stochastic model is advanced, which is established according to the principle of operational research and, based on this model, a sample is given, which discusses the details of application in the stock control of service stations. The sample is simplified but implies the validity of the model in optimizing the storage of petroleum products in the market.展开更多
Floating Storage and Regasification Units(FSRU)form a rapidly expanding sector of LNG business.In many cases,FSRU now provide a more cost-effective and very flexible way to deliver natural gas to end users in comparis...Floating Storage and Regasification Units(FSRU)form a rapidly expanding sector of LNG business.In many cases,FSRU now provide a more cost-effective and very flexible way to deliver natural gas to end users in comparison with shore-based terminals.Due to enhanced operations FSRU are more complex compared to LNG carriers(LNGC).FSRU are essentially merge of the attributes of shore-based terminals and LNGC.The existing FSRU fleet is formed of new-build vessels and converted LNGC.Together with their advantages FSRU come with the inherent problems of handling and storing LNG.Here we focus on the rollover issues that occur on FSRU and suggest ways to improve handling to minimize the impacts of those events.Rollover is a physical mixing process in a single tank with two or more different parcels of LNG of different compositions,temperatures and densities that can manifest in large boil-off rates,beyond handling-equipment capacities,and large tank pressure increases culminating rapidly.If prevention/mitigation actions are not implemented,uncontrolled venting of boil off gas in vapor form to the atmosphere is a likely consequence involving flammability hazards and tank structure over-pressurization with potential damage.This study provides in-depth analysis of FSRU rollovers based on observations of more than twenty rollovers on many different FSRU.The analysis focuses on LNG saturated vapor pressure(SVP)rather than the traditional approach of focusing on boil-off rate(BOG).This approach allows efficient rollover management without any in-built rollover prevention means.Strategies are developed for managing a combination of FSRU tanks utilizing rollover prevention and mitigation actions,as well as efficient pre-planning for LNG stock management.Novel rules of thumb for predicting time to rollover onset,based on many observed FSRU rollovers provide operators with real-time insight to what rollover preventive and mitigating actions are effective in specific circumstances.展开更多
文摘The primary intent of the current research is to provide insights regarding the management of spare parts within the supply chain,in conjunction with offering some methods for enhancing forecasting and inventory management.In particular,to use classical forecasting methods,the use of weak and unstable demand is not recommended.Furthermore,statistical performance measures are not involved in this particular context.Furthermore,it is expected that maintenance contracts will be aligned with different levels.In addition to the examination of some literature reviews,some tools will guide us through this process.The article proposes new performance analysis methods that will help integrate inventory management and statistical performance while considering decision maker priorities through the use of different methodologies and parts age segmentation.The study will also identify critical level policies by comparing different types of spenders according to the inventory management model,also with separate and common inventory policies.Each process of the study is combined with a comparative analysis of different forecasting methods and inventory management models based on N.A.C.C.parts supply chain data,allowing us to identify a set of methodologies and parameter recommendations based on parts segmentation and supply chain prioritization.
文摘A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service stations. In this paper the inventory theory including its background and characteristics is introduced. At the same time, the application of the theory in some trades today, especially in petroleum trade, is analyzed. Then (s, S) stochastic model is advanced, which is established according to the principle of operational research and, based on this model, a sample is given, which discusses the details of application in the stock control of service stations. The sample is simplified but implies the validity of the model in optimizing the storage of petroleum products in the market.
文摘Floating Storage and Regasification Units(FSRU)form a rapidly expanding sector of LNG business.In many cases,FSRU now provide a more cost-effective and very flexible way to deliver natural gas to end users in comparison with shore-based terminals.Due to enhanced operations FSRU are more complex compared to LNG carriers(LNGC).FSRU are essentially merge of the attributes of shore-based terminals and LNGC.The existing FSRU fleet is formed of new-build vessels and converted LNGC.Together with their advantages FSRU come with the inherent problems of handling and storing LNG.Here we focus on the rollover issues that occur on FSRU and suggest ways to improve handling to minimize the impacts of those events.Rollover is a physical mixing process in a single tank with two or more different parcels of LNG of different compositions,temperatures and densities that can manifest in large boil-off rates,beyond handling-equipment capacities,and large tank pressure increases culminating rapidly.If prevention/mitigation actions are not implemented,uncontrolled venting of boil off gas in vapor form to the atmosphere is a likely consequence involving flammability hazards and tank structure over-pressurization with potential damage.This study provides in-depth analysis of FSRU rollovers based on observations of more than twenty rollovers on many different FSRU.The analysis focuses on LNG saturated vapor pressure(SVP)rather than the traditional approach of focusing on boil-off rate(BOG).This approach allows efficient rollover management without any in-built rollover prevention means.Strategies are developed for managing a combination of FSRU tanks utilizing rollover prevention and mitigation actions,as well as efficient pre-planning for LNG stock management.Novel rules of thumb for predicting time to rollover onset,based on many observed FSRU rollovers provide operators with real-time insight to what rollover preventive and mitigating actions are effective in specific circumstances.
