1. functional requirements: the first row of pipelines needs to be connected with the trailer driven pump and the liquid supply port of the locomotive to transport materials, so only one pipeline is needed to meet the functional requirements, and the pipeline layout can be simplified, reducing pipeline resistance and wear.
2. Transportation safety: In the process of trailer transportation, the first pipeline needs to bear the vibration and impact caused by the overall movement of the trailer. The use of thicker pipes can improve their compressive capacity and reduce the risk of pipeline rupture.