WHILE CUTTING A NOTCH IN A 10 3/4 INCH METAL PIPE WITH TORCH, AN IGNITION OCCURRED WHEN HOT MET AL OR A SPARK FELL DOWN INTO A PIPE THAT HAD BEEN DRILLED TO PUMP WATER FROM. PRIOR TO CUTTING T HE PIPE, A WATER SOAKED WOOL FIRST AID BLANKET HAD BEEN PLACED INSIDE THE HOLE BETWEEN THE CASING AND THE METAL PIPE TO PREVENT HOT METAL OR A SPARK FROM FALLING DOWN THE HOLE.