PROCESS SAFETY QUESTION 3 [30 marks] Chlorine gas at the outlet of the electrolysis unit is...

 

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PROCESS SAFETY QUESTION 3 [30 marks] Chlorine gas at the outlet of the electrolysis unit is dried and compressed to be used in different chemical processes. If possible, liquefaction of chlorine should be avoided because safety precautions for liquid chlorine are more severe than for gaseous chlorine. However, liquefaction can be necessary for reason like purification, storage or transport. Chlorine liquefaction is performed by compression and cooling. Liquid chlorine is stored in pressure storage tanks. The tanks are pressurized by gaseous chlorine or by a handling gas suitable for this application, e.g., nitrogen Figure 1: Chlorine storage tank a) Perform a risk evaluation (HAZOP study) and formulate possible countermeasures for the following process upsets a. Too high pressure b. Too much weight of the tank b) Discuss layers of protection (LOPA) embedded in the storage unit PROCESS SAFETY QUESTION 3 [30 marks] Chlorine gas at the outlet of the electrolysis unit is dried and compressed to be used in different chemical processes. If possible, liquefaction of chlorine should be avoided because safety precautions for liquid chlorine are more severe than for gaseous chlorine. However, liquefaction can be necessary for reason like purification, storage or transport. Chlorine liquefaction is performed by compression and cooling. Liquid chlorine is stored in pressure storage tanks. The tanks are pressurized by gaseous chlorine or by a handling gas suitable for this application, e.g., nitrogen Figure 1: Chlorine storage tank a) Perform a risk evaluation (HAZOP study) and formulate possible countermeasures for the following process upsets a. Too high pressure b. Too much weight of the tank b) Discuss layers of protection (LOPA) embedded in the storage unit