51/1 PORTABLE ALARMS FOR COMBUSTIBLE GASES
51/2 EXPLOSION IN A STORAGE TANK
51/3 A REMOTELY OPERATED ISOLATION VALVE FAILS TO WORK WHEN NEEDED AS IT HAS NOT BEEN TESTED
51/4 DIESEL ENGINES
51/5 AN ACCIDENT WHILE CLEARING A CHOKED IMPULSE LINE
51/6 INCIDENTS FROM THE PAST
51/7 FOUR YEARS AGO
51/8 SEVEN TIMES SOMETHING BROKE – ON THE EIGHTH OCCASION SOMEONE WAS INJURED
51/9 ENTRY TO CONFINED SPACES – THE ATMOSPHERE MUST BE TESTED BEFORE AN ENTRY PERMIT IS ISSUED
51/10 WHAT THE LAW SAYS NO. 9
51/11 UNUSUAL ACCIDENTS NO.21