From the published press reports they seem to be:
1. The refrigeration system to keep the gas cool
was closed since long.
2. The vent gas
scrubber was underdesigned, not repaired and not connected.
3. The corroded
flare tower pipe not replaced and not connected.
4. The water
curtain jests were underdesigned to reach the maximum height.
5. All the
three tanks were filled in while one ought to have kept empty to use as
emergency bypass.
6. The
computerised pressure/temperature sensing system, a warning device to give
alarm and to control the situation at the time of abnormal condition was not
installed.
7. The
carbon steel valves were used instead of stainless steel and the valves 'were notorious
for leaking.
8. The
instruments to check the valve-leakage were not available.
9. The
wind direction and velocity indicator was not installed to warn the people
about leakage direction and severity.
10. The neighbouring community was not told of the significance of
the danger alarm and the dangers posed by the materials used in the plant.
11. Control instruments at the plant were faulty.
12. Maintenance and operational practices were deteriorated.
13. Chemical reactors, piping and valves were not purged, washed
and aired before maintenance operations.
14. The blind
disc to disallow the water in the tank through the valve was missing.
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