This installation is characterized in that {HEAD ~ the feeding pipe} has at least one zone situated at {TAIL ~ a lower level} than the tank level and that is provided with two conduits arranged parallel, and a second pump arranged on one of the two conduits 
This installation is characterized in that { HEAD ~ the feeding pipe } has at least one zone situated at { TAIL ~ a lower level } than the tank level and that is provided with two conduits arranged parallel , and a second pump arranged on one of the two conduits
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH