Page 86 - Plant design and economics for chemical engineers

TABLE 4
HAZOP study results for process in Fig. 3-1 (Continued)
Equipment Deviations Consequences of
reference fmm What event this deviation on Additional
and operating operating could cause item of equipment implications of Process
conditions conditions this deviation? under consideration this consequence indications Notes and questions
20. Volatile impurity Reagent released Tank rupture if PICA-1 Consider independent
in feed via RV-1 RV-1 fails PAH.
Consider sampling
before unloading.
No Same as less
Temperature
Less 21. Temperature of Possible vacuum Thermal stress What are temperature
inlet is colder (see less pressure) on tank limits of tank%
than normal
22. Low tank See Events lo-13 Thermal stress What are pressure
pressure on tank limits of tank?
More 23. Temperature of See Event 18 Thermal stress What are temperature
inlet is hotter on tank limits of tank?
than normal
24. External fire Tank fails Reagent released What could cause an
external fire?
What are fire-protec-
tion capabilities?
Is fire protec-
tion adequate?
Feed pump Flow
P-l Less 25. V-2 closed Pump cavitates Damage to pump FICA-l See Event 1.
26. V-4 closed Deadhead pump Damage to pump FICA-l Any other problem
with deadhead? ’
27. Line plugs Pump cavitates Damage to pump FICA-l See Event 1.
28. FV-1 fails closed Deadhead pump Damage to pump FICA-1 See Event 26.