2 PUMPMEN WERE INSTALLING A PUMP AT X/C 27 SSM M1 RETURN THEY KNOCKED A HOLE IN STOPPING BETWEEN HIGH PRESSURE AREA AND LOW PRESSURE AREA. WHILE PUTTING PUMP THROUGH HOLE ONE OF THE PERSON'S R ECEIVING PUMP LOW PRESSURE SIDE BUPMPED STOPPINGDISLODGING DEBRIS WHICH WAS BLOWN UP INTO HIS FACE UNDER SAFETY GLASSES INTO EYE.