Download Computer Control and Human Error by Trevor Kletz PDF

By Trevor Kletz

Content material:
Preface

, Pages iii-iv
Forethought

, Page vii
Introduction

, Pages 1-2
1 - a few incidents that experience happened, usually in computer-controlled approach plants

, Pages 3-44
2 - chance and operability (hazop) stories utilized to computer-controlled strategy plants

, Pages 45-80
3 - the explanations why computer-controlled platforms fail

, Pages 81-113
Afterthoughts

, Pages 114-116
Index

, Pages 117-120

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Additional resources for Computer Control and Human Error

Sample text

1). 4). 4). • Train a number of engineers so that they are equally at home in the fields of process engineering and computer control (9). • Publicize the incidents that occur on your plants so that others can learn from them (see Preface). Remember: • computers provide new and easier opportunities for making familiar errors; • people can do what we want them to do; computers can do only what we tell them to do. 11. APPENDIX: SOME ADDITIONAL CONTROL FUNCTIONS THAT COMPUTERS MIGHT UNDERTAKE This section suggests two additional tasks which computers might be programmed to undertake.

1994, Atom, 433: 39. G. , 1993, IEEE Computer, 26 (7): 18. Institution of Chemical Engineers, 1994, Slide Training Package No. 6. , 1 May 1993, The Daily Telegraph. Chemical Industries Association, 1985, Chemical Safety Summary, 56 (221): 6 (Chemical Industries Association, London). , 1992, Explosion in a sulphonation process, 7th International Symposium on Loss Prevention and Safety Promotion in the Process Industries, Taormina, Italy, Volume 1 (SRP Partners, Rome). , 1991, An Engineer's View of Human Error, 2nd edition (Institution of Chemical Engineers, Rugby, UK), 10.

The computer responded with impressive speed, slamming slide valves shut and causing a flow reversal along the riser. Fortunately there were no injuries and only a small fire, at a leaking joint. 9 During the Hazop of computer-controlled plants we should consider the results of errors in entering data. Accidental entering of wrong data can be minimized, as already stated, by requiring operators to carry out at least two operations — for example, entering figures and then moving a cursor. Standards should be written and vendors chosen so that a computer will reject or query data or instructions that are outside specified ranges, deviate more than a specified amount from the existing value, or fail consistency tests.

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