(a) What is the primary function of the Inert Gas System (IGS) on a modern oil tanker? (8)

(i) To increase cargo discharge speed.

(ii) To maintain the temperature of heavy crude oil.

(iii) To prevent explosions in cargo tanks by maintaining a low oxygen environment.

(iv) To eliminate static electricity in the pump room.

Briefly justify your answer.

(b) With a line diagram, indicate the safety equipments installed within the Inert Gas System of a tanker ship and explain the function of at least two equipments. (8)