Abstract: What’s the best conveying speed is a problem worth studying and testing deeply. Conveying speed affects not only the cost of the conduction and competitive ability of the conduction, but also the service life of the pipelines. This article is to define the best conveying speed from the different respects of hydraulic power loss and abrasion in accordance with the theory of existing two velocity fields initiated. Also, this contrive idea has been tested and used on many short-distance pipelines.

Key words: Best speed, Fluming pipeline