1.What is tagging and locking system? II. Mention three activities in a processing plant that will call for tagging and locking system III. State the difference between confined and unconfined vapour explosion IV. Mention Five (5) scenarios or events that call for design of pressure relief valve V. Sate Three (3) common pressure relief valves

B. What are the objectives of the following regulations in health and safety at work? COSHH, and The Control of Noise at Work Regulations 2005 and state three (3) requirements of PUWER. II. what is the difference between super imposed back pressure and built-up back pressure.