$1.$ Re$-$read Example $11-2$ in the book, then repeat the HAZOP study, this time with the node being the "monomer feed". Develop an Excel table formatted similarly to the one on pg$\mathrm{.}477.$ Ignore the "Action Required" column. Write at least one paragraph to accompany your table, describing the analysis you performed and the choices you made. Your analysis should answer the following questions: What process parameter was chosen, and why? What are the possible deviations, and the causes of those deviations? $$ What could the consequences be$?$ What safeguards are already in place to prevent those consequences? exothermic, so a cooling system ent$).$ In the event that the cool$-$ This would lead to an increase in Example $11-2$ Consider the reactor system shown in Figure $11-6.$ The reaction is exothermir is used to remove the excess energy of reaction $($this is the design intent$).$ In th ing function is lost, the temperature of the reactor would increase. This would reaction rate, resulting in additional energy release. The ultimate result would be a with pressures exceeding the bursting pressure of the reactor vessel. in the reactor is measured and is used to control the cooling water with a valve Perform a partial HAZOP study on this unit to improve the safety of the proces cooling coil as a study node, a process parameter of flow, and the guide words of No $.$ Solution The guide words are applied to the study node of the cooling coils with the proces flow. The HAZOP results are shown in Table $11-10($though the table does not contain the com results of the HAZOP study$).$ e the safety of the process. Use the words of NO$,$ HIGH, and Low. o coils with the process parameter of le does not contain the complete Reactor Monomer Feed $-$ Cooling Coil Cooling Water Out $+$ Cooling Water In $204$ H S H TC Thermocouple Figure $11-6$ An exothermic reaction controlled by cooling water. Table $11-10$ HAZOP Study Applied to the Exothermic Reactor of Example $11-2$ Project name: Example $11-4$ Date: July $18,2019$ Process: Reactor of Example $11-4$ Page $1$ of $2$ Section: Reactor shown in example $11-2$ Reference drawing: Study Process Deviations Item node parameters $($Guide words$)$ Possible causes Possible consequences Existing safeguards Action required $1$A Cooling Flow coils No $1.$ Control valve fails $1.$ Loss of cooling, $1$ & $2.$ Flow $1.$ Select valve to fail open. closed possible runaway. transmitter with $2.$ Plugged cooling coils $2.$ Same as $1.$ low$-$flow alarm and $2.$ Install filter with high$-$temperature maintenance procedure. alarm on reactor. Install cooling water flow meter and low$-$flow alarm. Install high$-$temperature alarm to alert operator. $3.$ Cooling water service $3.$ Same as $1.3,4,5.$ No $3.$ Check and monitor failure. safeguards. reliability of water service. $4.$ Controller fails and $4.$ Same as $1.4.$ Place controller on critical closes valve. instrumentation list. $5.$ Air pressure fails, $5.$ Same as I. $5.$ See $1$A$.$I. closing valve. $1.$ Control valve fails $1.$ Reactor cools, reactant I. No safeguards. $.$ Instruct operators and open. concentration builds, update procedures. possible sleeping reactor.. $2.$ Controller fails and $2.$ Same as $1.2.$ Flow transmitter $1.$ Place controller on critical opens valve. with high$-$flow instrumentation list. See $1$A$\mathrm{.}4$ alarm. $1.$ Partially plugged $1.$ Diminished cooling, $1.$ See $1$ A$\mathrm{.}11.$ See $1$A$\mathrm{.}2$ cooling coils. possible runaway. $2.$ Partial water source $2.$ Same as $1.2.$ See $1$A$.12.$ See $1$A$\mathrm{.}2$ failure. $3.$ Control valve fails to $3.$ Same as $1.3.$ No safeguard. $3.$ Place valve on critical respond. instrumentation list. High Low