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Page Title:
Table 4.19. Example HAZOP Study for the Cooling Water Chlorination System |
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|  DOE-HDBK-1100-2004
Table 4.19. Example HAZOP Study for the Cooling Water Chlorination System
LINE/VESSEL: Cooling Water Chlorination System DATE: December 28, 1992
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PAGE:
GUIDE
SCEN-
DEVIATION
CAUSE
CONSEQUENCE
SAFETY LEVELS
ACTION
WORD
ARIO
None
No flow -
Pump failure.
No chlorine flow to tower
Chlorination pump
1
chlorination loop
Loss of electric power to
basin. Low chlorine
malfunction alarm.
pump.
concentration in tower
basin.
Low water level in tower
Potential pump damage.
Tower basin low water
2
basin.
level alarm.
No chlorine flow to tower
basin. Low chlorine
Tower basin water level
concentration in tower
indication.
basin.
Less
Low flow -
None identified
3
chlorination loop
More
High flow -
None identified
4
Note: Pump normally
chlorination loop
runs at full speed.
Reverse
Backflow - in
None identified
5
chlorination loop
None
No flow - chlorine to
No/low level in chlorine
No chlorine flow to tower
Local pressure indication
6
chlorination loop
drum.
basin. Low chlorine
on chlorine injection line.
Pressure reducing valve
concentration in tower
fails closed.
basin.
Local flow indication on
chlorine injection line
(rotameter).
51
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