Optimal number of cycles in sequential transportation

In sequentially transported oil pipelines, to reduce oil mixing losses, the order of transportation is generally determined based on the degree of similarity in the physical properties of the oils being transported. The batches for sequential transportation are optimized by comprehensively considering the impact of project investment and oil blending treatment on the transportation sequence (typically represented by the present value of costs). The factors mainly considered for sequentially transported batches are:  Tank capacity at the first station ；  Tank capacity at intermediate stations and terminal stations ；  Land occupied by oil tanks ；  Mixed oil treatment costs ；  Depreciation loss due to oil grade downgrade. Technical and economic comparisons are conducted across different batch ranges; after analyzing operational convenience and transportation safety, the optimal transportation batch is determined.

Since this is a discussion, it would be better to move beyond the rules set by experts or textbooks. In my opinion, for refined oil pipelines or crude oil pipelines, the optimal number of cycles is one that ensures sufficient capacity for mixing different types of oil and can meet market supply demands to the greatest extent possible. Theoretically, there are many constraints on the optimal number of batch cycles, including limitations related to the capacity of the final storage facility and requirements regarding throughput, etc. In practice, however, it is the sales companies that use pipelines, not academic institutions; therefore, sales must be based on market demands, with the goal of meeting those demands as fully as possible to achieve maximum economic benefits. Moreover, the inherent hardware conditions of some oil storage facilities are fixed. Therefore, I believe that the optimal number of cycles for long-distance pipelines at present is one that results in the days required for diesel to be supplied along the pipeline being as close as possible to each other; other factors such as whether mixed oil can be reintroduced need not be considered (there’s simply a shortage of oil, so we’ll think about that when the situation improves). Welcome to continue the discussion.

\"Good\" means that the number of cycles is such that revenue exceeds costs; \"optimal\" refers to maximum efficiency. This is a simple explanation of the transfer cycle in oil depots. This post was last edited by Mimingmeng on 2008-1-2 21:19]

The flow rate of pipelines and batch delivery plans are generally adaptable. If the number of cycles is determined solely based on the days required for diesel and gasoline at various locations along the pipeline, the tank capacities at the start and end stations of the pipeline need to be sufficiently flexible (after all, factors such as season and regional batch arrangements must be taken into account), which will increase the investment in the pipeline as well as its unit cost. Furthermore, pipelines can also meet the requirements of sales companies regarding volume and the ratio of oil to gas through distribution methods (intermittent or continuous distribution). Mixed oil treatment and the depreciation resulting from oil grade reduction are not exactly the same as reblending. There are quality requirements for the reintegration of refined oil products; if these requirements are not met, a mixing treatment device must be installed (such as for mixing gasoline and diesel).