CREW WAS LEAVING SECTION TO GO OUTSIDE, A PIECE OF 4 INCH WATER LINE WAS LYING ALONG SIDE OD TRACK. IT CAUGHT ON MANTRIP AND CAME INTO DECK STRIKING HIM ON THE RIGHT ARM AND SHOULDER. HE WORKED UNTIL 10-18-2005 AND CALL IN STATING THAT HE WAS GOING TO SEE A DOCTOR. AT THIS TIME HE WAS TAKEN OFF WORK.