A HAZOP study is being conducted on a chemical plant. The team is reviewing the process for loading and unloading a tank of flammable liquid. It is important to carefully consider all of the potential hazards before operating a tank of flammable liquid. With a suitable example of substance, discuss the potential hazards associated with the following deviations from the normal operating conditions:

a) No flow of liquid into the tank
b) No flow of liquid out of the tank
c) No pressure in the tank
d) No temperature in the tank