EE WAS REMOVING A PLUGGED 6"" PIPE. HE WAS CONCERENED THAT HE WOULD LOSE A PART OF THE FITTING INTO THE RAW MILL, SO WAS STEADYING THE PIPE WITH HIS LEFT HAND WHILE LOOSENING THE SCREWS THAT HE LD THE PIPE IN PLACE. WHEN THE PIPE CAME LOOSE IT DROPPED PINNING HIS HAND BETWEEN THE PIPE AND GRATE. EE REPORTED THAT HE DID NOT ANTICIPATE THE WEIGHT OF THE PIPE.