One or more mud pump 10 pump mud from {HEAD ~ the pits} through {TAIL ~ the fill line} 12 and into the interior of the drill pipe DP 
One or more mud pump 10 pump mud from { HEAD ~ the pits } through { TAIL ~ the fill line } 12 and into the interior of the drill pipe DP
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH