Refining and Petrochemical Company HAZOP Minute Sheet | |||||
Project: Crude Distillation Unit | Node: 2 | Draw No:1 | |||
Node Description: Desalter and Associated Pipe Work | |||||
Guide Word | Cause | Consequence | Safeguards | Recommendation | |
1. High Pressure | 1. Automatic pressure controllers 10-PRC-1 failed 2. Discharge line L1 partially blocked causing low discharge rate 3. Low discharge rate of pump 10-P-25AB | 1. Poor salt dissolution from the crude 2. Formation of more stable oil-water emulsion difficult to separate | 1. Pressure safety valve will pop open and transformer will trip | 1. Frequently check and maintain pressure controller 2. Install low pressure alarm 3. Frequently check and maintain flow lines and pumps | |
2. Low Pressure | 1. Automatic pressure controller 10-PRC-1 failed | 1. Vapourisation of light ends from desalter 2. Transformer trips off |
| 1. Frequently check and maintain pressure controller | |
3. High Temperature | 1. High crude residence time in heat exchangers | 1. Loss of light ends from crude |
| 1. Install temperature regulator 2. Install High temperature alarm | |
4. Low Temperature | 1. Fouling of heat exchangers 2. Preheat train network failed | 1. Poor settling and oil loss in the effluent water |
| 1. Install temperature regulator 2. Install Low temperature alarm | |
5. High Level | 1. Level controller 10-dLRC-3 faulty 2. Discharge pump 10-P-25AB failed 3. Waste water valve V5 blocked | 1. Carryover of interface with oil into tower causing fouling and corrosion of downstream equipment 2. Level rises to electrode causing current flow and transformer trips |
| 1. Install high level alarm 2. Frequently check and maintain pumps and valves | |
6. Low Level | 1. Level controller 10-DLRC-3 faulty 2. Mixer valve V4 partly blocked | 1. Carryover of crude with effluent water |
| 1. Install low level alarm 2. Check mixer valve | |