A heat exchanger is used to heat flammable, volatile solvents, as shown in Figure $5\mathrm{.}1.$ The temperature of the outlet stream is measured by a thermocouple, and a controller valve manipulates the amount of steam to the heat exchanger to achieve the desired set point temperature:

Steam

Condensate

Figure $5\mathrm{.}1$ Heat Exchanger

a$)$ Identify the study nodes of the process.

b$)$ Perform a mini HAZOP study on the intention "hot volatile solvent from heat exchanger", and choose the flow as process parameter and apply at least three guided words.

c$)$ What can be implications of control loop failure?