Page 82 - Plant design and economics for chemical engineers

TABLE 4
HAZOP study results for process in Fig. 3-1

Equipment Deviations Consequences of
reference from 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
Storage tank Level
T-l Less 1. Tank runs dry Pump cavitates Damage to pump LIA-1, Can reagent react/
FICA-l explode if over-
heated in pump?
2. Rupture 4-in. Reagent released Potential fire LIA-1, Estimate release
discharge FICA-l quantity.
Consider second LAL
shutdown on pump.
3. V-3 open or broken Reagent released Potential fire LIA-1 Estimate release
quantity.
4. V-l open or broken Reagent released Potential fire LIA-1 Consider V-l protection.
5. Tank rupture Reagent released Potential fire LIA-1 What external events
can cause rupture?
More 6. Unload too much Tank overfills Reagent released LIA-1 Is RV-1 designed to
from tank truck via RV-1 relieve liquid at
loading rate?
Consider second
high level shutoff.
7. Reverse flow from Tank overfills Reagent released LIA-1 Consider check valve
process via RV-1 in pump discharge line.
No Same as less Consider second LAH
shutdown on feedlines.
Composition
Other than 8. Wrong reagent Possible reaction Possible tank Consider sampling
rupture before unloading.
As well as 9. Impurity in If volatile, possible Are other materials
reagent overpressure delivered in trucks?