EE WAS WALKING ALONG THE BELT AT THE 29W MN 1ST BELT TAILPIECE. A WATERLINE HANGER ABOVE HIM CAME LOOSE AND ALLOWED THE 4"" WATER LINE TO FALL. IT STRUCK THE EE ON THE TOP OF HIS LEFT SHOULDER. THERE WAS NO DAMAGE OR IMPAIRMENT TO MINING EQUIPMENT OR THE MINING OPERATION. DID NOT INVOLVE COMPLIANCE, JOB SKILLS, PROFICIENCY, TRAINING, ATTITUDE, PROTECTIVE ITEMS OR PROTECTIVE DEVICES.