А fuel hydrant system consists of two hydrant feed lines, one hydrant loop and all associated facilities. The fuel is pumped from the fuel hydrant pump station by two Feed Lines to the Hydrant Loop Lines, from which the fuel is distributed to the aircrafts via service vehicles

feed line - магистраль подачи топлива к гидранту, loop line - обводной трубопровод??

есть еще такое предложение:
The hydrant system is designed as a network with loops for flushing possibilities as well as redundant pit positions

здесь loops подразумевает замкнутые трубы/петли для промывки системы? Спасибо!