FIG 1 illustrates these active mud pits P1, P2, and {HEAD ~ P3} fluidly connected in {TAIL ~ series} 
fluidly connected in
FIG 1 illustrates these active mud pits P1 , P2 , and { HEAD ~ P3 } fluidly connected in { TAIL ~ series }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL